All Tools
Browse every Toolora tool by category. 100% client-side, free, no signup.
696 tools · 10 categories
Calculator
Finance & Money
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Mortgage Calculator
Mortgage calculator — monthly payment, total interest, amortization schedule, early payoff scenarios.
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Loan Comparison Calculator
Loan comparison calculator — compare equal-payment vs equal-principal, multiple loans side by side, total interest breakdown.
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Loan Prepayment Calculator
Loan prepayment calculator — see how much interest you save by paying extra each month or one-time, with breakeven analysis.
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Annuity Calculator
Annuity & retirement calculator — see monthly income from your savings, accumulation + payout phases, multiple scenarios.
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Compound Interest Calculator
Compound interest calculator — see how money grows over time, with monthly contributions, charts, and breakdown.
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Savings Goal Tracker
Savings goal tracker — set a target (down payment, trip, emergency fund), see weekly/monthly contribution and projected date.
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China Income Tax Calculator
China personal income tax calculator — monthly, annual, with 5 insurance + 1 fund deductions.
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China Company Income Tax Calculator
China company income tax calculator — small/micro (2.5%/5%/25%) vs general taxpayer, R&D super-deduction, loss carry-forward 5 years.
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China Personal Income Tax — Special Deduction Simulator
China personal income tax special deduction simulator — 7 categories (kids/elder/mortgage/rent/education/medical/infant), year-end reconciliation included.
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China Vehicle Purchase Tax Calculator
China vehicle purchase tax calculator — 10% rate on tax-exclusive price, with NEV exemption rules, plus on-road cost breakdown.
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China Second-Hand House Tax Calculator
China second-hand house transaction tax calculator — contract tax + VAT + personal income tax + agency fee + transfer fee, by city + house tenure + family situation.
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China Property Fee Calculator
Property fee calculator — calculate Chinese residential management fees, garage, heating, elevator, with regional rate references.
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Currency Converter
Currency converter — 50+ currencies with offline reference rates, convert without internet, source data updated each release.
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Expense Tracker
Expense tracker — log spend, categorize, see monthly totals, all in your browser.
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Wedding Budget Planner
Wedding budget planner — itemized cost calculator with regional benchmarks for venue, photography, catering, etc.
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Kids Allowance Calculator
Kids allowance calculator — age-appropriate weekly/monthly amount with chore-based breakdown, savings goal sandbox.
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Tip Calculator
Tip & split calculator — calculate tip by percentage, split bill among friends, round-up options, multi-currency.
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Meeting Cost Calculator
Meeting cost calculator — see how much that meeting is costing in real-time, with team salary data and overhead multiplier.
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Car Loan Calculator with Prepayment
Car loan calculator with prepayment — bank vs 4S dealer financing comparison, equal-installment / equal-principal / balloon plans, prepayment-savings simulation.
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LLM Pricing Calculator
Estimate daily and monthly LLM spend from tokens, request volume, and editable model prices.
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China Housing Provident Fund Loan Calculator
China housing-provident-fund loan calculator — single + dual contributor max loan, monthly payment (equal-principal + equal-installment), top-30 cities 2025 caps.
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China Pension Calculator
China pension calculator — basic + personal-account + transitional pension formulas (2024 reform), by province average wage, contribution years, base, with 2055 projection.
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China Used-Car Price Estimator
China used-car price estimator — depreciation curve by brand tier + age + mileage + condition, plus 4S trade-in vs private vs auction net comparison.
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China Unemployment Benefits Calculator
China unemployment benefits calculator — monthly amount + total months by city + insurance years, per 2026 policy.
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China Overtime Pay Calculator
China overtime pay calculator — workday 1.5×, weekend 2×, statutory holiday 3× per Labor Law Art. 44, with 31 provincial minimum-wage tables.
Health & Body
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BMI Calculator
Body Mass Index calculator with WHO + Asian classifications — metric and imperial — browser-only
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BMR Calculator
BMR calculator — basal metabolic rate by Mifflin-St Jeor and Harris-Benedict (compared side-by-side).
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Calorie Calculator
Calorie calculator — daily calorie needs (BMR + TDEE), weight loss/gain targets, macro breakdown.
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Body Fat Calculator
Body fat % calculator — 4 formulas (US Navy / BMI-based / YMCA / Jackson-Pollock) with body shape visualization.
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Water Intake Calculator
Water intake calculator — daily water target by body weight, activity, climate. With drink-log to track today's progress.
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Protein Intake Calculator
Protein intake calculator — daily grams by body weight, activity, goal (cut/maintain/bulk), per ISSN 2017 guidelines.
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Macro Nutrient Calculator
Macro nutrient calculator — TDEE + protein/fat/carb split for cut/maintain/bulk goals, with 3 split presets (high-protein/keto/balanced) and meal example.
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Intermittent Fasting Tracker — 16:8 / OMAD / 5:2 / 36h Timer with Stages
Intermittent fasting tracker — 16:8 / 18:6 / 20:4 / OMAD / 5:2 / 36h timer with stages and history log.
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Weight Loss Tracker & Calorie Deficit Calculator
Weight loss tracker — set target, log daily weight, see trend, project goal date with real calorie math.
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Weight Training Tracker — 1RM Calculator & Strength Progress Log
Weight training tracker — log compound lifts (squat/bench/deadlift/OHP), track 1RM via Epley formula, see strength gains by week.
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Strength 1RM & Training Program
Strength 1RM calculator + training program — 6 formulas (Epley/Brzycki/Lombardi/O'Conner/Lander/Mayhew), %1RM table, Wendler 5/3/1 + Sheiko + Madcow templates.
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Heart Rate Zones Calculator
Heart rate zones calculator — max HR (4 formulas) + 5 training zones (recovery/aerobic/tempo/threshold/VO2max), with workout examples.
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Stair Climbing Calorie Calculator
Stair climbing calorie calculator — calculate kcal burned by floors climbed, with METs-based formula.
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Running Pace Calculator
Running pace calculator — convert between pace / time / distance, predict 5K/10K/half/full marathon from one race.
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Marathon Time Predictor
Marathon time predictor — input 5k/10k/half time, get full marathon prediction via 3 formulas (Riegel/Cameron/VDOT), with pace zones and weekly mileage advice.
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Sleep Cycle Calculator
Sleep cycle calculator — 90-minute REM cycles. Find best bedtime if you must wake at X, or best wake time if you sleep at Y.
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Sleep Debt Calculator
Sleep debt calculator — track this week's sleep hours, see your accumulated debt, get a realistic recovery plan based on research.
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Ovulation & Fertility Tracker
Ovulation & fertility tracker — predict next 6 months of fertile windows, track BBT, find best conception days.
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Safe Period & Ovulation Calculator
Period & ovulation calculator — predict next period, fertile window, safe days (based on calendar method).
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Pregnancy Due Date Calculator
Pregnancy due date calculator — track weeks, trimester, baby development by week.
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China Maternity Benefits Calculator
China maternity benefits calculator — leave days by province (98 base + extension 30-180 days), maternity allowance (avg-wage × leave-days / 30), medical reimbursement, 2025 policy.
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Child Adult-Height Predictor
Child adult-height predictor — 3 scientific methods (mid-parental / Khamis-Roche / CDC growth percentile), with confidence range + growth chart.
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China Child Vaccine Schedule (0-6y)
China 0-6y child immunization schedule — 11 free + 12 paid vaccines, generates personalized calendar from baby's birthdate, with per-dose reminders.
Daily Life
18-
Age Calculator
Calculate your exact age — years, months, days, hours. Compare two dates or count to a future date.
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Date Difference Calculator
Days / weeks / months / years between two dates — plus business-days mode — browser-only
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Countdown Timer
Countdown timer — to any date and event, with live ticking down to seconds.
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Work Anniversary Calculator
Work tenure calculator — service years, annual leave entitlement (China), retirement countdown.
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Timezone Converter
Convert any time between any two timezones — DST-aware, IANA database — browser-only
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Timezone Meeting Planner
Plan meetings across timezones — see when everyone's working hours overlap.
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Cooking Unit Converter
Cooking unit converter — tsp / tbsp / cup / oz / ml / g for 100+ common ingredients with density.
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Recipe Scaler
Recipe scaler — paste any recipe, change servings, get all ingredient amounts auto-scaled. Handles fractions and unit conversion.
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Fish Tank Calculator
Fish tank size calculator — input fish species and count, get the minimum tank gallons/liters needed and stocking density warnings.
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Pet Age Calculator
Pet age calculator — accurate dog/cat human-age equivalent, with breed size adjustment, lifespan stages.
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Pet Food Calculator
Pet food calculator — RER + activity factor for dogs and cats, exact daily grams based on weight, age, neuter status, and kibble kcal/100g.
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Screen Time Budget
Screen time budget — track and visualize daily screen time across phone/tablet/PC, with age-based recommendations from WHO/AAP.
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BPM Tap Counter
BPM tap counter — tap the spacebar to the beat, instantly get tempo with running average, find your song's tempo for DJ / dance / metronome.
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Typing Speed Test
Typing speed test — WPM, accuracy, real-time mistakes, English + Chinese pinyin modes.
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Airline Luggage Allowance Checker
Airline luggage allowance — 50+ carriers' carry-on / checked baggage rules with size, weight, and excess fee.
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China Drunk-Driving Penalty Reference
China drunk-driving penalty reference — BAC threshold (20/80), license suspension/revocation, criminal charges, insurance impact, by scenario.
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China Three-Child Birth Subsidy Policy Finder
China three-child birth subsidy policy finder — per province / city one-time + monthly + housing + education subsidies (2024-2025 latest).
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Pomodoro Timer
Pomodoro timer — 25/5 classic, plus 50/10 and 90/15 long-focus modes, with sound, browser tab title, daily stats.
Education & Tests
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Scientific Calculator
Scientific calculator — sin / cos / log / sqrt / power, with full keyboard input + history, deg/rad mode.
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Unit Converter
Convert between length, weight, temperature, area, volume, speed, time — instant, browser-only
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Percentage Calculator
5 common percentage calculations — "x% of y", "x is what% of y", percentage change, increase/decrease — instant, browser-only
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Random Number Generator
Generate cryptographically-secure random integers — single or batch, with/without duplicates — browser-only
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Math Formula Reference
Math formula reference — algebra, geometry, trigonometry, calculus, statistics, all in one place.
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Periodic Table
Interactive periodic table — 118 elements, properties, electron config, search.
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Birthday Paradox Calculator
Birthday paradox calculator — see the probability of shared birthdays in a group of N people, visualized step by step.
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Aspect Ratio Calculator
Calculate aspect ratio — fix any 1 of [width, height, ratio], get the other two.
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Number Base Converter
Number base converter — binary, octal, decimal, hex, and any base 2-36. Bitwise too.
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Complex Number Calculator
Complex number calculator — +-×÷ + conjugate + modulus + argument + polar/Cartesian conversion + powers + roots + Euler form, complex plane visualization.
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Matrix Calculator
Matrix calculator — add/sub/multiply/inverse/determinant/transpose/rank/RREF/eigenvalues for n×m matrices, step-by-step.
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Quadratic Equation Solver
Quadratic equation solver — ax² + bx + c = 0, discriminant analysis, real + complex roots, vertex/intercepts, parabola visualization.
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Trigonometry Calculator
Trigonometry calculator — sin/cos/tan + inverse + sec/csc/cot, degree/radian/gradient, unit circle visualization, exact values.
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Derivative Calculator (Step-by-Step)
Derivative calculator with step-by-step — symbolic differentiation, chain/product/quotient rule shown, plot f(x) and f'(x).
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Integral Calculator (Step-by-Step)
Indefinite integral calculator step-by-step — symbolic integration, substitution + integration by parts shown, plot f(x) and F(x).
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Statistics Basic Calculator
Basic statistics calculator — mean/median/mode/variance/std-dev/quartiles/range/IQR/skewness/kurtosis + histogram + box plot, paste any numbers.
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Probability Distribution Visualizer
Probability distribution visualizer — normal/t/chi-sq/F/binomial/poisson/exp/uniform PDF+CDF, P(a≤X≤b) area, z/p table replacement.
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Chemistry Equation Balancer
Chemistry equation balancer — paste an unbalanced equation, solve coefficients using the matrix method, show step-by-step.
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Linux Permission (chmod) Calculator
Linux permission (chmod) calculator — convert between octal (755), symbolic (rwxr-xr-x), and ls -l forms, with safety warnings.
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PX REM EM Converter
CSS px ↔ rem ↔ em converter — visual scale, base font size adjustable.
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Unix Timestamp Converter
Unix timestamp ⇄ human date — seconds / milliseconds / ISO 8601 — UTC and local — browser-only
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IELTS Band Calculator
IELTS band calculator — convert listening/reading raw scores to band, average four skills, see your overall band.
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MBTI Quick Test (28 Questions, 16 Personality Types)
MBTI quick test — 28 questions, 5 minutes, get your 4-letter type with detailed reading.
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College Major Matcher (Holland RIASEC, 40 Questions)
College major matcher — Holland code (RIASEC) test, 40 questions, recommend 10+ matching majors with career path.
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China Gaokao Major Recommender (2026, 3+1+2 New Gaokao)
China gaokao major recommender 2026 — filter by score range + subject combo (3+1+2) + interest + employment outlook, 150+ undergrad majors across 12 disciplines.
Chinese Culture
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BaZi (Four Pillars) Calculator
BaZi (Four Pillars) calculator — Chinese metaphysics birth chart with 8 characters, five elements analysis.
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Chinese Zodiac Sign Checker (Sheng Xiao)
Chinese zodiac checker — your animal sign, element, compatibility, lucky numbers/colors by birth year.
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Chinese Zodiac Fortune (Daily / Monthly / Yearly)
Chinese zodiac fortune — daily/monthly/yearly outlook for 12 zodiac signs in love, career, wealth, health.
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Chinese Zodiac Compatibility (Shengxiao Match)
Chinese zodiac compatibility — match two people by their zodiac signs, 144 pair combinations with reading.
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Western Zodiac Calculator (Sun Sign)
Western zodiac calculator — your sign, element, ruling planet, compatibility, daily traits.
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Lunar Calendar Converter (Chinese Nongli)
Gregorian ⇄ Chinese Lunar (Nongli) calendar — bi-directional, accurate 1900-2100.
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Chinese Numeric Converter
Arabic ⇄ Chinese number — simple (一二三), formal (壹貳參), or amount (金额大写 with 元角分).
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Chinese Stroke Counter
Chinese character stroke counter — count strokes for any hanzi, traditional or simplified.
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Chinese Lunar Almanac (Huangli)
Chinese lunar almanac (huangli) — daily 宜/忌 advice, 24 solar terms, 干支/生肖, auspicious hours, any date 1900-2100.
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China Marriage Betrothal Reference
China marriage betrothal reference — 30+ provinces' typical betrothal money + dowry + 3-gold/5-gold averages (2024-2026 public data).
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China Retirement Age Calculator
China retirement age calculator (2025 reform) — exact retirement date by birth year + gender + worker category, per Sept 2024 NPC reform.
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Color Mixer
Color mixer — blend any two colors with adjustable ratio, RGB/HSL/LAB color space, predict the result and copy hex.
More
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24-Point Solver & Game
24-point solver and game — enter 4 numbers and get every solution instantly, or play random hands against the clock.
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Add Days to Date Calculator
Add or subtract days, weeks, months, and years from any date — plus a business-day mode that skips weekends. Runs entirely in your browser.
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Age Difference Calculator
The exact gap between two birthdays — years/months/days, percentage, and the date one person is twice the other's age — browser-only
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AI Token Counter
AI token counter — estimate token count for GPT / Claude / Gemini, with per-model cost calculator (2026 pricing).
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APR to APY Calculator
Convert nominal APR to effective APY (and back) at any compounding frequency — daily, monthly, quarterly, or continuous. Two-way, instant, browser-only.
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Blood Alcohol Content (BAC) Calculator
Widmark-formula BAC estimate from drinks, body weight, sex and time — educational only, never a fit-to-drive verdict — browser-only
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Board Foot Calculator
Thickness × width × length ÷ 12 = board feet — multi-row cut list, per-BF cost, imperial ⇄ m³ — browser-only
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Break-Even Calculator
How many units must you sell to stop losing money? Enter fixed costs, price, and variable cost per unit for break-even units, break-even revenue, and contribution margin — browser-only
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Air Conditioner BTU Calculator
Room area × ceiling × orientation × people → cooling BTU/h, 匹 (horsepower) and kW — sizes an AC right the first time — browser-only.
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Business Days Calculator
Working days between two dates, or a date N working days out — weekends + holidays excluded, browser-only
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Caffeine Calculator
Track how much caffeine is still in your system, how much is left at bedtime, and when it drops to a sleep-friendly level — half-life model, browser-only.
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Calorie Deficit Calculator
Pick a daily calorie deficit, enter your current and goal weight, and see how many weeks it takes and the date you'd hit your target — with a safety check, browser-only
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Calories Burned Calculator
MET-based calorie burn for 30+ activities — running, cycling, swimming, HIIT, housework — stack and total — browser-only
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Car Lease Calculator
Cap cost, residual, money factor, term → exact monthly payment with depreciation + finance + tax breakdown — 100% in your browser
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Carpet Calculator
Rooms + roll width + waste → linear metres, billed area (m² / ft² / sq yard) and cost — browser-only
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CD Calculator
Certificate of Deposit maturity, interest & effective APY — APY or APR + compounding, early-withdrawal penalty, CD ladder — browser-only
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Clothing Size Converter
US ⇄ UK ⇄ EU ⇄ CN ⇄ S–XXL for men & women — tops, trousers, dresses, suits — with the body measurements behind every size — browser-only
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Coffee Ratio Calculator
Coffee-to-water ratio calculator — type 1:16, pick a brew method, get exact grams of coffee and water for any batch
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Permutation & Combination Calculator
nPr, nCr, n!, n^r and combinations-with-repetition — exact BigInt results with the formula and worked steps — browser-only
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Commission Calculator
Work out sales commission three ways — flat rate, progressive tiers, or reverse-solve the sales you need to hit an income target. Browser-only, shareable.
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Concrete Calculator
Slab, column, round footing & stairs → cubic meters/yards + cement bags, sand and gravel — browser-only
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Crypto Profit Calculator
Net profit, ROI%, fees, and the break-even sell price for a crypto trade — enter by quantity or by amount invested, both buy and sell fees counted — browser-only
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Days Until Date Calculator
How many days until a date — plus weeks, months, business days, exact remaining, and the weekday it lands on
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Debt Payoff Calculator
Snowball vs avalanche — payoff date, total interest, and what an extra payment saves — browser-only
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Density Calculator
Solve ρ = m / V for density, mass, or volume · mixed units (g, kg, lb, mL, L, cm³, gallon) · 20 substance presets · floats-or-sinks verdict — all browser-only
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Depth of Field Calculator
Near limit, far limit, total depth of field & hyperfocal distance from your sensor, focal length, aperture and focus distance — browser-only
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Dilution Calculator
Solve C1V1 = C2V2 and ratio dilutions (1:10) — stock + water amounts in mL / L / fl oz / gal — browser-only
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Discount Calculator
Sale price, amount saved, % off — plus stacked discounts, BOGO, spend-X-save-Y, tax, and reverse % — instant, browser-only
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Dividend Yield Calculator
Share price + annual dividend → yield %, annual/quarterly/monthly income, and yield on cost after years of dividend growth — browser-only
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Drywall Calculator
Wall + ceiling area → sheets, drywall screws, joint tape & compound — metric and imperial — browser-only
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Duration Converter
Seconds ⇄ minutes ⇄ hours ⇄ days ⇄ weeks, plus human-readable, ISO 8601 duration and HH:MM:SS — one input, every format — browser-only
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Electricity Cost Calculator
Power × hours × tariff → kWh and cost per day, month, and year — add multiple appliances, account for standby — browser-only.
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EV Charging Cost Calculator
Battery kWh + charge % + tariff → cost per charge, per 100km/mile, and how much you save vs petrol — browser-only
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Fence Calculator
Total run + post spacing → posts, panels/pickets, rails, concrete bags — metric & imperial — browser-only
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Final Grade Calculator
Current grade + final weight + target → exactly what you need on the final — browser-only
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Flooring Calculator
Room sizes + flooring type + box coverage + waste → net area, boxes, planks, and cost — metric or imperial, browser-only.
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Fraction Calculator
Add, subtract, multiply, divide fractions — auto-reduced, with steps, mixed ⇄ improper ⇄ decimal — browser-only
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Freelance Hourly Rate Calculator
Back into the hourly rate you must charge from your target salary, business expenses, billable hours, profit margin, and taxes — browser-only
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Fuel Cost Calculator
Trip fuel cost from distance + economy + price — round trip, per-person split, L/100km ⇄ MPG — browser-only.
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Future Value Calculator
Project the future value of a lump sum plus regular contributions — full time-value-of-money math, year-by-year, browser-only
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2048 Game (Slide, Merge, Reach 2048)
2048 game — slide tiles, combine numbers, reach 2048. Pure browser, no ads, your high score saved locally.
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GCD & LCM Calculator
GCD + LCM of any list of integers — Euclidean steps, prime factorization, prime-factor table — exact BigInt math, browser-only
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Gear Ratio Calculator
Gear & transmission ratio plus bicycle gear inches, development and speed from cadence — exact, browser-only
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Golden Ratio Calculator
Split any length by φ = 1.618 — long/short segments, golden sequence, font scale, layout columns, golden rectangle — browser-only
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GPA Calculator
Weighted GPA from courses + credits + grades — US 4.0 / 4.3 and China 4.0 / 4.5 conversion, letter ⇄ percentage ⇄ point — browser-only
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Grade Calculator
Weighted course grade + what you need on the final — multi-row categories, letter grade, shareable link — browser-only
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Grass Seed Calculator
Lawn area + species + new/overseed → exact seed weight and bag count — metric & US — browser-only
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Gravel Calculator
Area + depth → volume, tonnes, bulk bags — driveways, drainage, paths — browser-only
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Half-Life Calculator
Solve any radioactive-decay unknown — initial amount, remaining amount, elapsed time, or half-life — with exact exponential math, all in your browser
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Heat Index Calculator
Air temperature + humidity to the real "feels-like" temperature, with NWS risk level — exact Rothfusz regression, browser-only
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Home Affordability Calculator
Income + debt + down payment + rate → the max home price a lender's 28/36 rule will actually approve — browser-only
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Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, amount, or temperature — pick any unknown, mix any units, runs in your browser
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Ideal Weight Calculator
Devine + Robinson + Miller + Hamwi formulas, side by side, plus the healthy BMI weight band — metric and imperial — browser-only
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Inflation Calculator
See what your money is really worth — future value, purchasing power, and the rule-of-72 halving point, all from one inflation rate
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ISO Date Deduplicator
Find duplicates and keep one clean copy of iso dates from pasted text or uploaded local files.
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ISO Date Extractor
Extract, dedupe, and export iso dates from pasted text or uploaded local files.
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ISO Date List Converter
Convert iso dates from pasted text or uploaded local files.
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ISO Date List Validator
Validate and explain issues in iso dates from pasted text or uploaded local files.
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ISO Date Normalizer
Normalize, sort, and prepare iso dates from pasted text or uploaded local files.
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Jet Lag Calculator
Estimate how many days jet lag will last and build a day-by-day plan to pre-shift your body clock before you fly — eastbound vs westbound, light and melatonin timing, all in your browser
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Markup & Margin Calculator
Cost ⇄ price ⇄ markup % ⇄ margin % — solve any two, see both rates side by side — 100% in your browser
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Modulo Calculator
a mod n in both conventions — the % your language returns AND the math mod that is never negative, plus floor quotient, modular power and inverse
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Molar Mass Calculator
Type any chemical formula — get molar mass, a per-element mass-percent table, and mass↔mole conversion. IUPAC weights, browser-only.
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MPG Calculator
Distance + fuel → MPG (US/UK), L/100km, km/L, all at once + cost per mile/km — browser-only
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Mulch Calculator
Garden bed area + spread depth → cubic yards, bags and bulk — multi-bed, metric/imperial — browser-only
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Net Worth Calculator
Add up assets, subtract debts, see your real net worth — with a debt-to-asset ratio and composition bars, all computed in your browser
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Note Frequency Calculator
Note name ⇄ frequency (Hz) — A4 = 440/432/442, MIDI number, cents off — browser-only
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Number Formatter
One number in, every format out: thousands grouping, currency, percent, scientific, engineering, compact (K/M/万), ordinal, byte size — plus reverse parsing. 100% browser-only.
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Ohm's Law Calculator
Enter any two of voltage, current, resistance, or power — get the other two plus the formula used — with mV/V/kV, µA/mA/A, Ω/kΩ/MΩ, mW/W/kW prefixes — browser-only.
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One-Rep Max Calculator
Estimate your 1RM from any set with five formulas at once, then read a full %1RM training-load table — kg or lb, browser-only
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Paint Calculator
Wall area → litres & cans of paint, with doors/windows deducted, coats and price — metric & US units, browser-only
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Payment Processing Fee Calculator
Stripe, PayPal, Square fees — see what lands in your account, and gross-up to net any target — 100% in your browser
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Percent Error Calculator
Compare a measured value against the true value — get percent error, absolute error, relative error, and signed high/low. Plus a percent-difference mode for two trials with no accepted answer.
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Percentage Change Calculator
Growth rate, drop, percentage-point gap, and reverse-solve the new value — signed, color-coded, browser-only
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Pizza Dough Calculator
Baker's percentage pizza dough — flour, water, salt, yeast, oil by weight — browser-only
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Plant Spacing Calculator
Bed size + in-row & row spacing → exact plant count — square vs triangular layout — browser-only
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Barbell Plate Calculator
Target weight → exactly which plates to slide on each end — kg & lb, with a live barbell diagram — browser-only
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Pool Volume Calculator
Find how many gallons (and liters and cubic meters) your pool holds — rectangle, round, oval, or sloped floor — in feet or meters
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PPI Calculator
Pixel density, dot pitch, physical size, aspect ratio & a retina check from resolution + diagonal — all in your browser
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Pregnancy Weight Gain Calculator
Pre-pregnancy BMI + week → IOM recommended total gain, the by-week target, and an on-track check — singleton & twins — browser-only
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Prime Number Calculator
Test primality · factorize · list primes in a range · find the N-th prime — exact BigInt math, browser-only
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Projectile Motion Calculator
Solve flight time, max height, range & impact speed from launch speed, angle and height — with a live trajectory plot, browser-only
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Pythagorean Theorem Calculator
Solve a²+b²=c² — find the hypotenuse, find a missing leg, or measure the distance between two points (2D & 3D). Browser-only.
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Ratio Calculator
Solve a:b = c:x, simplify ratios, split a total by a ratio, scale a recipe up or down — with full steps, browser-only
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Rent Affordability Calculator
How much rent can you actually afford? 30% rule, landlord 3× gate, and a debt-aware 50/30/20 number — all client-side
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Rent vs Buy Calculator
See whether buying beats renting and investing the difference — net cost, terminal equity, and the break-even year, all in your browser
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Resistor Color Code Calculator
Decode 4, 5 and 6-band resistors to Ω, tolerance and tempco — or go the other way, with a live color-band drawing
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Retirement Savings Calculator
Project your retirement pot from age, savings, monthly contributions, return and inflation — with a 4% safe-withdrawal income, growth curve, and goal-gap check. Browser-only.
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Ring Size Converter
US ⇄ UK ⇄ EU ⇄ JP ⇄ CN ⇄ inner circumference & diameter (mm) — type any one, get every size at once — browser-only
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ROI Calculator
ROI %, net gain, annualized ROI (CAGR) and payback period — one screen, share a link — 100% in your browser
-
Roman Numeral Converter
Arabic ⇄ Roman, both directions, live — strict validation, step-by-step breakdown, vinculum up to 3,999,999 — 100% browser-only
-
Roofing Calculator
Roof footprint + pitch → real sloped area, roofing squares, shingle bundles or sheets and underlayment rolls — metric & US, browser-only
-
Rule of 72 Calculator
Estimate doubling time from a rate (72 ÷ r), or the rate from a target time — side by side with the exact ln(2)/ln(1+r) figure — browser-only
-
Salary Raise Calculator
Turn a raise into real numbers — new salary by year/month/hour, dollar increase, and the inflation-adjusted raise that tells you if you actually came out ahead
-
Salary to Hourly Converter
Hourly ⇄ daily ⇄ weekly ⇄ monthly ⇄ annual pay — set your hours/week and weeks/year, see all five at once — browser-only
-
Sales Tax Calculator
Add or remove US sales tax — split state + local rates, real 2024 state base rates on tap, browser-only
-
Scientific Notation Converter
Plain ⇄ scientific (a×10ⁿ) ⇄ engineering ⇄ E-notation — with significant figures, exact big/small numbers — browser-only
-
Shoe Size Converter
US ⇄ UK ⇄ EU ⇄ CN ⇄ JP + foot length (cm/in) — men, women, kids — browser-only
-
Significant Figures Calculator
Count sig figs · round to N significant figures · do sig-fig arithmetic — exact string-level math, browser-only
-
Simple Interest Calculator
I = P × r × t — solve for interest, principal, rate, or time, plus total and a simple-vs-compound gap — browser-only
-
Slope Calculator
Two points in, full line out — slope, angle, distance, midpoint, y = mx + b and grade % — browser-only
-
Square Footage Calculator
Add every room, get one total in ft² and m² at once — waste % + cost — browser-only
-
Stair Calculator
Total rise + steps → rise/run, slope, Blondel comfort check + side-view diagram — metric & imperial, browser-only
-
Sudoku Generator
Sudoku generator and solver — 4 difficulties (easy / medium / hard / expert), unique-solution guaranteed, play in the browser or print as PDF.
-
Take-Home Pay Calculator
Gross → net pay, any country — your own tax rate, pre-tax & post-tax deductions, reverse-solve — browser-only
-
TDEE Calculator
TDEE calculator — BMR × activity factor, with cut/bulk calorie targets and projected weekly weight change.
-
Tempo Delay Calculator
Turn any BPM into a full delay-time table — milliseconds and Hz for every note value, plus dotted and triplet. Built for mixing and producing.
-
Test Grade Calculator
Answers wrong → percent + letter grade + a full printable grading chart — the teacher's EZ Grader, browser-only
-
Tile Calculator
Room area + tile size + grout joint + waste → tiles, boxes, and cost — metric or imperial, browser-only.
-
Time Card Calculator
Weekly time card — clock in/out + lunch → daily hours, weekly total, gross pay, 40h overtime — browser-only
-
Time Duration Calculator
Hours between two times, add or subtract time, and add up a timesheet — decimal hours + pay — browser-only
-
Tire Size Calculator
Decode 225/45R17 into diameter, sidewall, circumference & revs/km — then compare two tires for speedometer error and clearance change. Browser-only.
-
Triangle Calculator
Triangle solver — SSS, SAS, ASA, AAS, and the ambiguous SSA case via law of sines + law of cosines. All sides, angles, area, perimeter, type, drawn to scale.
-
Trip Cost Splitter
Split group trip, dinner & shared-flat costs — track who paid what, who joined which expense, and get the fewest transfers to settle up. 100% in your browser.
-
VAT / Sales Tax Calculator
Add tax, remove tax, or find the rate — net ⇄ gross at any VAT / GST / sales-tax rate — instant, browser-only
-
VO₂max Calculator
Estimate your maximal oxygen uptake from four field tests — Cooper run, 1.5-mile, resting HR, Rockport walk — with a fitness grade by age and sex
-
Waist-to-Hip Ratio Calculator
WHR = waist ÷ hip, scored against the WHO health-risk bands by sex, with an optional waist-to-height check — runs entirely in your browser
-
Wallpaper Calculator
Wall size + roll spec + pattern repeat → strips per roll, total strips, rolls to buy — handles straight & half-drop match — browser-only
-
Wavelength Frequency Calculator
Convert between wavelength λ, frequency f, and photon energy E · c = λf · E = hf · spectrum band + visible colour · browser-only
-
Week Number Calculator
What week number is today? ISO 8601 (Mon-start) + US (Sun-start), plus year + week → date range — browser-only
-
Weighted Grade Calculator
Items + weights → your current course grade, with letter and banked points — browser-only
-
Wind Chill Calculator
Turn air temperature and wind speed into a feels-like number — and a frostbite warning — using the official NWS / Environment Canada formula. Metric or imperial, browser-only.
-
Z-Score Calculator
Standardize any value, reverse a z-score back to raw, or compute μ and σ from a dataset — with left/right/two-tailed normal probabilities and percentile
Text
Chinese
9-
Chinese Pinyin Converter
Chinese characters to pinyin — with tone marks or numbers, supports simplified and traditional.
-
Chinese Idiom Search
800+ everyday chengyu — pinyin, origin, usage.
-
Chinese Poetry Search
Chinese classical poetry — 300+ hand-annotated Tang/Song/Yuan canon (唐诗宋词元曲) plus 80,000+ searchable Tang/Song/Shijing/Chuci poems on demand.
-
Chinese Name Generator
Chinese name generator — meaningful Chinese names with pinyin, meaning, and stroke count.
-
Chinese Stroke Counter
Chinese character stroke counter — count strokes for any hanzi, traditional or simplified.
-
Chengyu Chain Game
Chengyu chain game with a 30,000+ idiom dictionary (full 汉语成语大词典 coverage). Start with any idiom; the computer continues with one whose first character matches your last.
-
Traditional ⇄ Simplified Chinese Converter
Traditional ⇄ Simplified Chinese — fast, character-level, no API.
-
Wuxing Name Recommender (Five Elements Naming)
Five Elements (Wuxing) name recommender — based on Bazi gaps, suggest characters that balance the missing elements.
-
Handwriting Practice Sheet
Handwriting practice sheet generator — Chinese 米字格 / 田字格 / 四线三格 (English) PDF-ready printable.
English Learning
5-
English Vocabulary Test
English vocabulary test — estimate your vocab size in 5 minutes, levels CET-4 / CET-6 / IELTS / TOEFL / GRE.
-
English Grammar Rules Reference
English grammar rules reference — 60+ core grammar rules with side-by-side examples, common mistakes, bilingual explanations.
-
English Collocations
English collocations reference — 200+ common verb + noun / adj + noun / verb + prep collocations with usage examples.
-
English Irregular Verbs Reference
English irregular verbs reference — 200+ verbs with base / past / past participle, Chinese gloss, in-browser audio, pattern filter, and a flash-card practice mode.
-
HSK Chinese Vocabulary Test
HSK Chinese vocabulary test — estimate your Mandarin level (HSK 1-6) in 5 minutes with real exam words.
100-Word Vocab Decks
15-
Arabic 500 Essential Words
Arabic 500 essential A1–A2 MSA words — Arabic script with full ḥarakāt, DIN 31635 romanization, gender, three-form verbs, audio TTS.
-
Dutch 500 Essential Words
Dutch 500 essential A1–A2 words — IPA + de/het articles + 6-person conjugation + audio TTS.
-
French 600 Essential Words — DELF A1, A2 & B1 Core
600 French words covering the full DELF A1-A2 référentiel plus B1 core — IPA, gender, full Bescherelle conjugation (présent, passé composé, futur simple), free TTS audio, 16 life-context categories.
-
German 500 Essential Words
German 500 essential words (A1-A2 + B1 core) with IPA, der/die/das, full Präsens, Präteritum, Perfekt, Partizip II for verbs, and browser TTS.
-
Hindi 500 Essential Words
Hindi 500 essential A1–A2 words — Devanagari, IAST, IPA, gender, three-form verbs, audio TTS.
-
Indonesian 500 Essential Words
Indonesian 500 essential A1–A2 words — KBBI spelling + Jakarta IPA + audio TTS. No tones, no conjugation.
-
Italian 500 Essential Words
Italian 500 essential words (A1-A2 Plida) with IPA, gender, full verb conjugation, audio TTS.
-
Japanese 500 Essential Words (JLPT N5 + N4)
Japanese 500 essential words covering JLPT N5 and N4, with kana, romaji, kanji and audio TTS.
-
Korean 500 Essential Words (TOPIK I–II)
Korean 500 essential words spanning TOPIK I and TOPIK II — start speaking Korean today with Hangul, romanization, audio TTS, and full verb conjugations.
-
Portuguese 500 Essential Words
Portuguese 500 essential words — A1 to A2 Brazilian Portuguese, with IPA, gender, conjugation, audio TTS.
-
Russian 500 Essential Words (TORFL A1-A2)
Russian 500 essential words covering the full TORFL A1-A2 syllabus, with Cyrillic, stress marks, BGN/PCGN romanization, gender, full verb conjugation, and audio TTS.
-
Spanish 500 Essential Words
Spanish 500 essential A1–A2 words — start speaking Spanish today, with pronunciation, example sentences, verb conjugations and audio TTS.
-
Thai 500 Essential Words
Thai 500 essential A1–A2 words — Thai script + RTGS + IPA + 5 tones + audio TTS.
-
Turkish 500 Essential Words
Turkish 500 essential A1–A2 words — Istanbul standard + IPA + vowel harmony + audio TTS.
-
Vietnamese 500 Essential Words
Vietnamese 500 essential A1–A2 words — chữ Quốc ngữ + IPA + 6 tones + audio TTS.
Writing & Creative
17-
Headline Analyzer
Headline analyzer — score your title's clickability, SEO length, emotional words, power words.
-
Slogan Generator
Slogan generator — 30+ proven copywriting formulas, generate brand slogans in seconds, bilingual.
-
Hashtag Generator
Hashtag generator — Instagram / TikTok / Twitter / Xiaohongshu / Weibo hashtags from your topic.
-
Cover Letter Generator
Cover letter generator — fill 6 fields, pick a tone, get a tailored cover letter in 4 templates, bilingual.
-
Resume Template Builder
Resume template builder — fill a form, get a clean PDF resume in 3 templates (modern / classic / minimal), bilingual.
-
Interview Questions Bank
Interview questions bank — 300+ real questions across behavioral / technical / case / culture, with strong answer frameworks.
-
Prompt Template Library
200+ prompt templates for ChatGPT, Claude, Gemini — copy-paste, browse by use case.
-
System Prompt Builder
Turn role, task, constraints, and output rules into a structured system prompt you can copy.
-
AI Eval Planner
Generate eval cases, pass criteria, and edge cases from an AI feature, risks, and user path.
-
AI Model Comparison
AI model comparison — 20+ models (GPT / Claude / Gemini / Llama / Qwen) across price, context, speed, capabilities (2026).
-
AI Token Counter
AI token counter — estimate token count for GPT / Claude / Gemini, with per-model cost calculator (2026 pricing).
-
Content Refresh Checklist
Generate a prioritized content refresh checklist from URL, topic, and performance signals.
-
Meta Description Brief Generator
Generate SEO meta description options from a page topic, keywords, and audience.
-
YouTube Title Analyzer
Score a YouTube title for clarity, specificity, length, and keyword position.
-
Weekly Report Generator
Weekly report generator — fill blanks, get clean markdown, no AI hallucination.
-
Multicultural Name Generator
Random names from 11 cultures — Chinese, English, Japanese, Korean, Arabic, Russian + 5 European.
-
Lorem Ipsum Generator
Classic Lorem Ipsum filler text — paragraphs, sentences, or words — copy in one click, browser-only
Text Utilities
27-
Text Diff
Compare two blocks of text — line-by-line additions, deletions, equal — colour highlighted, browser-only
-
Text Deduplicator
Remove duplicate lines from any list — case-sensitive optional, whitespace-trim optional, count duplicates — browser-only
-
Text Sorter
Sort lines alphabetically, numerically, by length, or reverse — case-sensitive optional — browser-only
-
Word Counter
Count words, characters, sentences, paragraphs and reading time in any text — instant, browser-only
-
Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, Title Case, UPPER, lower — instant, browser-only
-
Regex Tester
Test JavaScript regex live — match highlighting, group capture, replace preview, flag toggles — browser-only
-
URL Slug Generator
Turn any title into a clean URL slug — lowercase, dashes, ASCII-safe transliteration, multiline batch — browser-only
-
Email Validator
Validate emails — RFC 5321 syntax + bulk paste + disposable detection + MX hint.
-
ROT13 Encoder & Decoder
ROT13 / ROT47 / Caesar cipher — encode and decode in your browser, instant.
-
Text to Binary Converter
Text to binary (and back) — UTF-8 aware, 8/16/32 bit grouping, emoji safe.
-
Morse Code Translator
Text to Morse code and back — encode, decode, audio playback, ITU standard.
-
HTML Entities Encoder
Encode/decode HTML entities — & < > " ' and all numeric refs — browser-only
-
Markdown to HTML
Convert Markdown to clean HTML — headings, lists, code, links, images, tables — instant live preview, browser-only
-
Markdown Editor with Live Preview
Markdown editor with live split-pane preview — GFM tables, fenced code with syntax highlight, math, emoji, table of contents, export as HTML / PDF-ready.
-
Markdown Table Generator
Build Markdown tables visually — add/remove rows, column alignment, paste from Excel / CSV — browser-only
-
Image to ASCII Art
Image to ASCII art — convert any image to text-based art with adjustable density and character set.
-
ASCII Art Generator
Generate ASCII art from text — figlet-style banners, multiple fonts.
-
Log Line Cleaner
Clean noisy logs by removing timestamps, ANSI colors, blank lines, long lines, or non-error entries in your browser.
-
JSON Lines Formatter
Validate JSONL line by line, pretty-print it, convert to a JSON array, or export a CSV-like table locally.
-
JSONPath / JMESPath Query Tester
JSONPath / JMESPath query tester — paste JSON, write a path, see matched values + matched paths highlighted live.
-
JSON Schema Inferencer
Paste JSON or NDJSON samples and infer a Draft 2020-12 style schema with types, required fields, formats, enums, and examples.
-
GraphQL Formatter & Minifier
GraphQL formatter + minifier — beautify query/mutation/subscription/schema, validate syntax, copy minified single-line for HTTP body.
-
.env File Validator
.env file validator — parse Bash-style .env, detect dups / missing required / unsafe values / leaked secret patterns; cross-compare prod / staging / dev envs.
-
ENV Secret Scanner
Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.
-
LaTeX Equation Editor (Live Preview)
LaTeX equation editor live — type/paste LaTeX, see math rendered live via MathJax 3 (CDN), copy as SVG/PNG/Markdown/MathML, 30+ symbol palette.
-
Kanji & Chinese Character Stroke Order Viewer
Kanji + Chinese character stroke order viewer — animated SVG showing correct stroke sequence + direction, with romaji/pinyin/meaning, 500+ common characters.
-
Log Error Analyzer
Paste logs and group repeated errors, warnings, stack traces, HTTP statuses, endpoint patterns, and time ranges into a local incident report.
Extract & Clean Lists
105-
Email Address Extractor
Extract, dedupe, and export email addresses from pasted text or uploaded local files.
-
Email Address List Validator
Validate and explain issues in email addresses from pasted text or uploaded local files.
-
Email Address Normalizer
Normalize, sort, and prepare email addresses from pasted text or uploaded local files.
-
Email Address Deduplicator
Find duplicates and keep one clean copy of email addresses from pasted text or uploaded local files.
-
Email Address List Converter
Convert email addresses from pasted text or uploaded local files.
-
URL Extractor
Extract, dedupe, and export urls from pasted text or uploaded local files.
-
URL List Validator
Validate and explain issues in urls from pasted text or uploaded local files.
-
URL Normalizer
Normalize, sort, and prepare urls from pasted text or uploaded local files.
-
URL Deduplicator
Find duplicates and keep one clean copy of urls from pasted text or uploaded local files.
-
URL List Converter
Convert urls from pasted text or uploaded local files.
-
Domain Name Extractor
Extract, dedupe, and export domain names from pasted text or uploaded local files.
-
Domain Name List Validator
Validate and explain issues in domain names from pasted text or uploaded local files.
-
Domain Name Normalizer
Normalize, sort, and prepare domain names from pasted text or uploaded local files.
-
Domain Name Deduplicator
Find duplicates and keep one clean copy of domain names from pasted text or uploaded local files.
-
Domain Name List Converter
Convert domain names from pasted text or uploaded local files.
-
IPv4 Address Extractor
Extract, dedupe, and export ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address List Validator
Validate and explain issues in ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address Normalizer
Normalize, sort, and prepare ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address Deduplicator
Find duplicates and keep one clean copy of ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address List Converter
Convert ipv4 addresses from pasted text or uploaded local files.
-
IPv6 Address Extractor
Extract, dedupe, and export ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address List Validator
Validate and explain issues in ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address Normalizer
Normalize, sort, and prepare ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address Deduplicator
Find duplicates and keep one clean copy of ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address List Converter
Convert ipv6 addresses from pasted text or uploaded local files.
-
UUID Extractor
Extract, dedupe, and export uuids from pasted text or uploaded local files.
-
UUID List Validator
Validate and explain issues in uuids from pasted text or uploaded local files.
-
UUID Normalizer
Normalize, sort, and prepare uuids from pasted text or uploaded local files.
-
UUID Deduplicator
Find duplicates and keep one clean copy of uuids from pasted text or uploaded local files.
-
UUID List Converter
Convert uuids from pasted text or uploaded local files.
-
Hashtag Extractor
Extract, dedupe, and export hashtags from pasted text or uploaded local files.
-
Hashtag List Validator
Validate and explain issues in hashtags from pasted text or uploaded local files.
-
Hashtag Normalizer
Normalize, sort, and prepare hashtags from pasted text or uploaded local files.
-
Hashtag Deduplicator
Find duplicates and keep one clean copy of hashtags from pasted text or uploaded local files.
-
Hashtag List Converter
Convert hashtags from pasted text or uploaded local files.
-
Social Handle Extractor
Extract, dedupe, and export social handles from pasted text or uploaded local files.
-
Social Handle List Validator
Validate and explain issues in social handles from pasted text or uploaded local files.
-
Social Handle Normalizer
Normalize, sort, and prepare social handles from pasted text or uploaded local files.
-
Social Handle Deduplicator
Find duplicates and keep one clean copy of social handles from pasted text or uploaded local files.
-
Social Handle List Converter
Convert social handles from pasted text or uploaded local files.
-
Phone Number Extractor
Extract, dedupe, and export phone numbers from pasted text or uploaded local files.
-
Phone Number List Validator
Validate and explain issues in phone numbers from pasted text or uploaded local files.
-
Phone Number Normalizer
Normalize, sort, and prepare phone numbers from pasted text or uploaded local files.
-
Phone Number Deduplicator
Find duplicates and keep one clean copy of phone numbers from pasted text or uploaded local files.
-
Phone Number List Converter
Convert phone numbers from pasted text or uploaded local files.
-
Postal Code Extractor
Extract, dedupe, and export postal codes from pasted text or uploaded local files.
-
Postal Code List Validator
Validate and explain issues in postal codes from pasted text or uploaded local files.
-
Postal Code Normalizer
Normalize, sort, and prepare postal codes from pasted text or uploaded local files.
-
Postal Code Deduplicator
Find duplicates and keep one clean copy of postal codes from pasted text or uploaded local files.
-
Postal Code List Converter
Convert postal codes from pasted text or uploaded local files.
-
Credit Card Number Extractor
Extract, dedupe, and export credit card numbers from pasted text or uploaded local files.
-
Credit Card Number List Validator
Validate and explain issues in credit card numbers from pasted text or uploaded local files.
-
Credit Card Number Normalizer
Normalize, sort, and prepare credit card numbers from pasted text or uploaded local files.
-
Credit Card Number Deduplicator
Find duplicates and keep one clean copy of credit card numbers from pasted text or uploaded local files.
-
Credit Card Number List Converter
Convert credit card numbers from pasted text or uploaded local files.
-
Hex Color Extractor
Extract, dedupe, and export hex colors from pasted text or uploaded local files.
-
Hex Color List Validator
Validate and explain issues in hex colors from pasted text or uploaded local files.
-
Hex Color Normalizer
Normalize, sort, and prepare hex colors from pasted text or uploaded local files.
-
Hex Color Deduplicator
Find duplicates and keep one clean copy of hex colors from pasted text or uploaded local files.
-
Hex Color List Converter
Convert hex colors from pasted text or uploaded local files.
-
CSS Variable Extractor
Extract, dedupe, and export css variables from pasted text or uploaded local files.
-
CSS Variable List Validator
Validate and explain issues in css variables from pasted text or uploaded local files.
-
CSS Variable Normalizer
Normalize, sort, and prepare css variables from pasted text or uploaded local files.
-
CSS Variable Deduplicator
Find duplicates and keep one clean copy of css variables from pasted text or uploaded local files.
-
CSS Variable List Converter
Convert css variables from pasted text or uploaded local files.
-
Environment Variable Extractor
Extract, dedupe, and export environment variables from pasted text or uploaded local files.
-
Environment Variable List Validator
Validate and explain issues in environment variables from pasted text or uploaded local files.
-
Environment Variable Normalizer
Normalize, sort, and prepare environment variables from pasted text or uploaded local files.
-
Environment Variable Deduplicator
Find duplicates and keep one clean copy of environment variables from pasted text or uploaded local files.
-
Environment Variable List Converter
Convert environment variables from pasted text or uploaded local files.
-
HTTP Header Extractor
Extract, dedupe, and export http headers from pasted text or uploaded local files.
-
HTTP Header List Validator
Validate and explain issues in http headers from pasted text or uploaded local files.
-
HTTP Header Normalizer
Normalize, sort, and prepare http headers from pasted text or uploaded local files.
-
HTTP Header Deduplicator
Find duplicates and keep one clean copy of http headers from pasted text or uploaded local files.
-
HTTP Header List Converter
Convert http headers from pasted text or uploaded local files.
-
JWT Token Extractor
Extract, dedupe, and export jwt tokens from pasted text or uploaded local files.
-
JWT Token List Validator
Validate and explain issues in jwt tokens from pasted text or uploaded local files.
-
JWT Token Normalizer
Normalize, sort, and prepare jwt tokens from pasted text or uploaded local files.
-
JWT Token Deduplicator
Find duplicates and keep one clean copy of jwt tokens from pasted text or uploaded local files.
-
JWT Token List Converter
Convert jwt tokens from pasted text or uploaded local files.
-
Base64 Block Extractor
Extract, dedupe, and export base64 blocks from pasted text or uploaded local files.
-
Base64 Block List Validator
Validate and explain issues in base64 blocks from pasted text or uploaded local files.
-
Base64 Block Normalizer
Normalize, sort, and prepare base64 blocks from pasted text or uploaded local files.
-
Base64 Block Deduplicator
Find duplicates and keep one clean copy of base64 blocks from pasted text or uploaded local files.
-
Base64 Block List Converter
Convert base64 blocks from pasted text or uploaded local files.
-
ISO Date Extractor
Extract, dedupe, and export iso dates from pasted text or uploaded local files.
-
ISO Date List Validator
Validate and explain issues in iso dates from pasted text or uploaded local files.
-
ISO Date Normalizer
Normalize, sort, and prepare iso dates from pasted text or uploaded local files.
-
ISO Date Deduplicator
Find duplicates and keep one clean copy of iso dates from pasted text or uploaded local files.
-
ISO Date List Converter
Convert iso dates from pasted text or uploaded local files.
-
Semantic Version Extractor
Extract, dedupe, and export semantic versions from pasted text or uploaded local files.
-
Semantic Version List Validator
Validate and explain issues in semantic versions from pasted text or uploaded local files.
-
Semantic Version Normalizer
Normalize, sort, and prepare semantic versions from pasted text or uploaded local files.
-
Semantic Version Deduplicator
Find duplicates and keep one clean copy of semantic versions from pasted text or uploaded local files.
-
Semantic Version List Converter
Convert semantic versions from pasted text or uploaded local files.
-
MAC Address Extractor
Extract, dedupe, and export mac addresses from pasted text or uploaded local files.
-
MAC Address List Validator
Validate and explain issues in mac addresses from pasted text or uploaded local files.
-
MAC Address Normalizer
Normalize, sort, and prepare mac addresses from pasted text or uploaded local files.
-
MAC Address Deduplicator
Find duplicates and keep one clean copy of mac addresses from pasted text or uploaded local files.
-
MAC Address List Converter
Convert mac addresses from pasted text or uploaded local files.
-
DOI Extractor
Extract, dedupe, and export dois from pasted text or uploaded local files.
-
DOI List Validator
Validate and explain issues in dois from pasted text or uploaded local files.
-
DOI Normalizer
Normalize, sort, and prepare dois from pasted text or uploaded local files.
-
DOI Deduplicator
Find duplicates and keep one clean copy of dois from pasted text or uploaded local files.
-
DOI List Converter
Convert dois from pasted text or uploaded local files.
Lifestyle & Fun
11-
Cat Breed Finder (10-Question Lifestyle Quiz)
Cat breed finder — answer 10 lifestyle questions, get 5 matching cat breeds with personality, grooming needs, friendliness.
-
Dog Breed Finder (10-Question Lifestyle Quiz)
Dog breed finder — answer 10 questions about your lifestyle, get 5 matching breeds with size, temperament, exercise needs.
-
Dream Interpretation Dictionary (Zhougong + Jung)
Dream dictionary — search dream symbols and meanings (Chinese 周公解梦 + Jungian).
-
Palmistry Guide — 6 Major Lines & 7 Mounts with Diagrams
Palmistry guide — 6 major lines + 7 mounts explained with diagrams, traditional readings, bilingual.
-
Chinese Acupoint Locator
200+ meridian acupoints / WHO 2008 standard locations / with contraindications, manipulation, and combinations.
-
Yoga Pose Library
Yoga pose library — 60+ asanas with Sanskrit + Chinese + English names, benefits, contraindications, modifications.
-
Emoji Finder
Unicode 15.1 / 1500+ emojis with bilingual search — one-click copy, browser-only
-
Emoji Recommender
Emoji recommender — paste your headline or post, get matching emoji suggestions.
-
Fortune Cookie (Daily Bilingual Fortune + Lucky Numbers + Lucky Color)
Daily fortune cookie — bilingual fortunes plus lucky numbers, lucky color, daily affirmation. 365 unique reads.
-
MBTI Quick Test (28 Questions, 16 Personality Types)
MBTI quick test — 28 questions, 5 minutes, get your 4-letter type with detailed reading.
-
College Major Matcher (Holland RIASEC, 40 Questions)
College major matcher — Holland code (RIASEC) test, 40 questions, recommend 10+ matching majors with career path.
Dev Cheatsheets
29-
awk + sed Cheatsheet
awk + sed cheat sheet — 80+ one-liners for text processing, with real examples and common pitfalls.
-
AWS CLI Cheatsheet
AWS CLI cheat sheet — 80+ commands for EC2 / S3 / IAM / Lambda / RDS / EKS / CloudFormation with real examples.
-
Bash Cheatsheet
Bash cheat sheet — 100+ commands & idioms for variables, conditionals, loops, functions, pipes, traps, with real one-liners.
-
curl Cheatsheet
curl cheat sheet — 80+ curl commands for GET/POST/auth/upload/download/SSL/proxy, with real examples and pitfalls.
-
DNS Record Explainer
DNS record explainer — all 18 common record types (A, AAAA, CNAME, MX, TXT, SRV, etc.) with syntax, examples, and gotchas.
-
Docker Cheatsheet
Docker command cheat sheet — 80+ commands with real examples, common mistakes, and Compose section.
-
Elasticsearch Cheatsheet
Elasticsearch cheat sheet — 80+ Query DSL, mapping, analyzer, aggregation, replication, with real examples.
-
Git Cheatsheet
Git command cheat sheet — searchable, with explanations, common mistakes, and real examples.
-
Go (Golang) Cheatsheet
Go (Golang) cheat sheet — 100+ idiomatic snippets covering syntax, goroutines, channels, generics, errors, stdlib.
-
HTTP Status Code Explorer
HTTP status code explorer — all 70+ codes with meaning, common causes, real examples, and what to check.
-
kubectl Cheatsheet
kubectl cheat sheet — 100+ Kubernetes commands with real examples, common pitfalls, and YAML snippets.
-
Markdown Cheat Sheet
Markdown syntax cheat sheet — every rule with live preview side by side, GFM + flavors.
-
MongoDB Cheatsheet
MongoDB cheat sheet — 80+ shell commands & query operators for CRUD, aggregation, indexing, replication.
-
Next.js Cheatsheet
Next.js 15 cheat sheet — App Router, Server Components, Server Actions, dynamic routes, with examples and pitfalls.
-
Nginx Cheatsheet
Nginx cheat sheet — common configs, location/server blocks, SSL, reverse proxy, gzip, real examples & gotchas.
-
npm / yarn / pnpm Cheatsheet
npm / yarn / pnpm cheat sheet — 80+ commands across init, install, scripts, publish, with cross-tool comparison.
-
Password Leak Checker
Password leak checker — check if your password has been seen in known breaches using k-anonymity (HIBP API style), the password never leaves your browser.
-
PostgreSQL Cheatsheet
PostgreSQL cheat sheet — 80+ commands & functions for psql, JSONB, CTEs, window functions, indexing, partitioning, advanced extensions.
-
Python Cheatsheet
Python cheat sheet — 100+ idiomatic Python snippets for string, list, dict, file, async, with real examples.
-
React Hooks Cheatsheet
React hooks cheat sheet — all 17 built-in hooks (useState / useEffect / useMemo / useTransition / useFormStatus...) with real examples and pitfalls.
-
Redis Cheatsheet
Redis cheat sheet — 80+ commands across strings, hashes, lists, sets, sorted sets, pub/sub, streams, scripts, with examples and pitfalls.
-
Regex Cheatsheet
Interactive regex cheat sheet — quick reference for every flavor (JS, Python, PCRE).
-
Rust Cheatsheet
Rust cheat sheet — 100+ snippets covering ownership, borrowing, lifetimes, traits, async, error handling.
-
SQL Cheatsheet
SQL cheat sheet — 100+ statements covering SELECT, JOIN, window functions, indexing, MySQL/PostgreSQL/SQLite differences.
-
Svelte Cheatsheet
Svelte 5 cheat sheet — runes ($state, $derived, $effect), snippets, props, stores, with Svelte 4 comparison.
-
Tailwind CSS Cheatsheet
Tailwind CSS cheat sheet — 100+ utility classes (spacing, color, flex, grid, typography, responsive) with live preview.
-
TypeScript Cheatsheet
TypeScript cheat sheet — 100+ snippets for types, generics, utility types, narrowing, async patterns.
-
Vim Cheatsheet
Vim cheat sheet — 100+ commands covering modes, motions, edits, search, registers, splits, with mnemonics.
-
Vue 3 Cheatsheet
Vue 3 cheat sheet — Composition API, reactivity, components, directives, Pinia, with side-by-side Options API comparison.
More
44-
Add Line Numbers
Number every line of pasted text — set start, step and separator, zero-pad to align, skip blanks, or strip numbers back off — browser-only
-
ASCII Table Generator
Paste CSV or TSV, get a monospace table that lines up: +--+ ASCII, Unicode box, Markdown, with real CJK width
-
ASCII Table Reference
Complete 0–127 ASCII table: decimal, hex, octal, binary, character, name, HTML entity and escape — control codes explained, click to copy, fully searchable.
-
Bionic Reading Converter
Bold the leading letters of every word — live preview, adjustable strength, export HTML — 100% in-browser
-
Character Frequency Counter
Count how often every character appears, ranked by frequency, with case, space and punctuation toggles, browser-only
-
Chemistry Equation Balancer
Chemistry equation balancer — paste an unbalanced equation, solve coefficients using the matrix method, show step-by-step.
-
China Gaokao Major Recommender (2026, 3+1+2 New Gaokao)
China gaokao major recommender 2026 — filter by score range + subject combo (3+1+2) + interest + employment outlook, 150+ undergrad majors across 12 disciplines.
-
Chinese Lunar Almanac (Huangli)
Chinese lunar almanac (huangli) — daily 宜/忌 advice, 24 solar terms, 干支/生肖, auspicious hours, any date 1900-2100.
-
Column Align
Pad delimited rows into an even monospace grid, like column -t, with correct CJK width — browser-only
-
Emoji Remover
Strip every emoji from text, family and skin-tone combos removed whole, your words and punctuation left untouched, browser-only
-
Fancy Text Generator
Turn plain text into 25 Unicode styles — bold, italic, script, fraktur, double-struck, circled, squared, fullwidth, upside-down, small caps, strikethrough — copy & paste anywhere, browser-only
-
Filename Sanitizer
Strip illegal characters and make any string a safe cross-platform filename, in your browser
-
Find and Replace Text
Batch find-and-replace on big text — regex, $1 capture groups, whole-word, case toggle, multiple chained rules — runs entirely in your browser
-
Leetspeak Converter
Turn plain text into 1337 and back, three strength levels, all in your browser
-
List Comparison
Compare two lists line by line: only in A, only in B, in both, and merged — all in your browser
-
List Randomizer
Shuffle a list, pick N at random, split into K teams, or draw one winner — fair crypto randomness, browser-only
-
List to Comma Separated
Turn a column of lines into a comma-separated string — add quotes, prefix/suffix, dedupe, sort, or split it back — browser-only
-
Markdown to Plain Text
Strip Markdown to clean plain text — headings, bold, links, code, lists, tables, HTML all flattened — browser-only
-
Math Formula Reference
Math formula reference — algebra, geometry, trigonometry, calculus, statistics, all in one place.
-
NATO Phonetic Alphabet Converter
Text to Alpha Bravo Charlie and back — spell anything aloud over the phone or radio, no mishearing.
-
Number Formatter
One number in, every format out: thousands grouping, currency, percent, scientific, engineering, compact (K/M/万), ordinal, byte size — plus reverse parsing. 100% browser-only.
-
Number to Words
Spell any number in English — cheque amounts, ordinals, British vs American "and" — 100% browser-only
-
Palindrome Checker
Tells you if text reads the same backwards, finds the longest palindrome inside, handles Chinese and emoji, runs in your browser
-
Pig Latin Translator
English to Pig Latin and back, in your browser. pig becomes igpay, egg becomes eggway, with case and punctuation kept.
-
Random Line Picker
Paste a list, pick N lines at random with crypto-grade fairness, draw raffle winners, copy in one click, all in your browser
-
Readability Score Checker
Paste English text and get Flesch Reading Ease plus five grade-level scores, syllable counts, and reading time — runs entirely in your browser
-
Reading Time Calculator
Paste text, get an accurate "X min read" plus a separate speaking time — counts CJK by character and English by word, all in your browser
-
Remove Line Breaks
Strip or replace line breaks, join wrapped lines into running text — keep-paragraphs mode, CRLF/CR/LF normalize, live preview — browser-only
-
Reverse Text Generator
Reverse text by character, word or line, flip each word, or turn writing upside down — Unicode and emoji safe, runs in your browser
-
Robots.txt Auditor
Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.
-
Roman Numeral Converter
Arabic ⇄ Roman, both directions, live — strict validation, step-by-step breakdown, vinculum up to 3,999,999 — 100% browser-only
-
Social Media Character Counter
Count characters against real X, Instagram, Weibo, LinkedIn, TikTok and SMS limits as you type, all in your browser
-
String Similarity Checker
Levenshtein edit distance, Dice, Jaro-Winkler and LCS side by side, with a 0-100% match score, all in your browser
-
Strip HTML Tags
Paste HTML source, get clean plain text. Block tags become line breaks, entities decode, allow-list keeps chosen tags, script content gets removed — all in your browser.
-
Syllable Counter
Count syllables in any English word or text, with a 5-7-5 haiku mode for poems
-
Tabs to Spaces Converter
Convert tabs to spaces and spaces to tabs, real tab-stop alignment, leading-indent or whole-line, all in your browser
-
Text to Speech
Read any text aloud with your browser's built-in voices — pick voice, speed, pitch, volume — 100% local, nothing uploaded
-
Text Wrap
Hard-wrap text at any column width, by word or by character, with optional line prefix, all in your browser
-
Unicode Character Inspector
Inspect any text character-by-character: code points, UTF-8/UTF-16 bytes, HTML entities, JS escapes, names, and hidden zero-width / confusable glyphs.
-
Unicode Normalizer
Normalize text to NFC, NFD, NFKC or NFKD, see code-point and byte counts shift, spot which characters changed, copy in one click, all in your browser
-
Unslugify
Turn my-blog-post, user_first_name and parseHTMLContent back into readable text, browser-only
-
UTF-8 Byte Counter
Count UTF-8 bytes, UTF-16 code units, Unicode code points and characters in any string, right in your browser
-
Word Frequency Counter
Rank every word + phrase by frequency, with keyword density, stop-word filtering, and n-gram analysis — browser-only
-
Zero Width Character Detector
Find and strip zero-width spaces, the BOM, no-break spaces and other invisible characters, then copy clean text — runs in your browser
Format Converter
Data Format
33-
JSON Formatter & Validator
Format, validate, and minify JSON instantly — right in your browser.
-
XML Formatter & Validator
Pretty-print, minify, and validate XML in your browser — preserves CDATA, comments, and namespaces.
-
YAML Formatter & Validator
Format and beautify YAML — re-indent, validate, minify, sort keys.
-
INI Formatter & Validator
Format and validate INI / TOML-like config — sort sections, align equal signs.
-
SQL Formatter
Format and beautify SQL — supports MySQL, PostgreSQL, BigQuery, SQLite and 17 more dialects.
-
CSS Formatter & Minifier
Format and beautify CSS — sort properties, indent rules, expand or minify.
-
CSV ⇄ JSON Converter
Convert CSV to JSON or JSON to CSV — handles quoted commas, newlines in cells, custom delimiter — browser-only
-
CSV to Markdown Table
Convert uploaded or pasted CSV into clean Markdown tables with quoted-cell support, locally in the browser.
-
CSV to TSV Converter
Convert CSV files to tab-separated values while preserving quoted commas, quotes, and multiline cells locally.
-
TSV to CSV Converter
Turn tab-separated files into standards-friendly CSV with proper quoting, download, and local processing.
-
CSV Deduplicator
Remove duplicate CSV rows by full row or selected key columns from uploaded files, locally and safely.
-
CSV Column Extractor
Upload or paste CSV, keep only selected columns by name or index, and export a smaller privacy-safe file.
-
CSV Sorter
Sort uploaded CSV rows by a selected column with numeric-aware ordering and local-only processing.
-
CSV Filter
Filter uploaded CSV rows by column value using contains, equals, or regex, with local browser processing.
-
CSV Transposer
Flip CSV rows and columns from uploaded files or pasted data, with ragged-row handling and local output.
-
CSV Header Normalizer
Standardize CSV header rows to snake_case, kebab-case, camelCase, or Title Case before imports and scripts.
-
CSV Stats Summary
Upload CSV and get a quick Markdown profile of filled, missing, unique, numeric, min, max, and average values.
-
CSV Data Quality Profiler
Upload CSV or TSV and profile missing values, inferred types, invalid cells, duplicate rows, whitespace issues, top values, and numeric outliers.
-
File MIME Type Inspector
Upload files and inspect filename, size, browser MIME type, extension, and magic-byte signature locally.
-
XML ⇄ JSON Converter
XML to JSON converter — preserves attributes, nested elements, CDATA. Reversible.
-
YAML ⇄ JSON Converter
Convert between YAML and JSON — both directions, pretty-printed, error messages with line numbers — browser-only
-
JSON Minifier
Minify JSON into a compact single line, optionally sort object keys, and keep everything local.
-
JSON Lines Formatter
Validate JSONL line by line, pretty-print it, convert to a JSON array, or export a CSV-like table locally.
-
JSON to TypeScript Interface
JSON to TypeScript interface — paste JSON, get clean interfaces with union types from arrays, optional vs required detection, root name customizable.
-
JSON Schema Inferencer
Paste JSON or NDJSON samples and infer a Draft 2020-12 style schema with types, required fields, formats, enums, and examples.
-
JSONPath / JMESPath Query Tester
JSONPath / JMESPath query tester — paste JSON, write a path, see matched values + matched paths highlighted live.
-
GraphQL Formatter & Minifier
GraphQL formatter + minifier — beautify query/mutation/subscription/schema, validate syntax, copy minified single-line for HTTP body.
-
OpenAPI Endpoint Auditor
Audit OpenAPI JSON or YAML for endpoint coverage, missing operation IDs, security gaps, and weak response documentation.
-
Package Lock Dependency Auditor
Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.
-
TOML Formatter + Converter
TOML formatter + converter — format/validate TOML 1.0, convert TOML ↔ JSON ↔ YAML, with error line/column.
-
HTML Table to CSV Converter
HTML table to CSV converter — paste HTML or full page source, extract all tables, get CSV/TSV/JSON/Excel-ready output with header detection + colspan/rowspan handling.
-
TypeScript to Zod Schema
TypeScript to Zod schema converter — paste interface/type, get z.object() schema, supports unions/optionals/nested/generics/enum/Record/Map/Set.
-
URL Query Params Extractor
Extract, deduplicate, inspect, copy, and export query parameters from one URL or many URLs locally.
Chinese Converters
5-
Chinese Pinyin Converter
Chinese characters to pinyin — with tone marks or numbers, supports simplified and traditional.
-
Traditional ⇄ Simplified Chinese Converter
Traditional ⇄ Simplified Chinese — fast, character-level, no API.
-
Lunar Calendar Converter (Chinese Nongli)
Gregorian ⇄ Chinese Lunar (Nongli) calendar — bi-directional, accurate 1900-2100.
-
Chinese Numeric Converter
Arabic ⇄ Chinese number — simple (一二三), formal (壹貳參), or amount (金额大写 with 元角分).
-
Chinese Zodiac Sign Checker (Sheng Xiao)
Chinese zodiac checker — your animal sign, element, compatibility, lucky numbers/colors by birth year.
Text & Markup
15-
Markdown to HTML
Convert Markdown to clean HTML — headings, lists, code, links, images, tables — instant live preview, browser-only
-
HTML to Markdown
HTML to Markdown — paste rich content, get clean .md with links, code, tables, lists preserved.
-
Markdown Table Generator
Build Markdown tables visually — add/remove rows, column alignment, paste from Excel / CSV — browser-only
-
Markdown TOC Generator
Markdown TOC generator — paste your markdown, get a clean table of contents with anchor links.
-
HTML Minifier
Minify HTML — strip comments, whitespace, optional attributes, inline CSS/JS. 40-60% smaller.
-
CSS Minifier
Minify CSS — strip comments, whitespace, shorten colors, merge selectors. 30-60% smaller.
-
JS Minifier
Minify JavaScript — strip comments, whitespace, optional name shortening. 40-70% smaller.
-
JS Obfuscator
Lightly obfuscate JavaScript in the browser: strip comments, remove debugger/console calls, and optionally wrap strings with base64.
-
HTML Form Extractor
Upload or paste HTML and extract forms, methods, actions, fields, labels, required flags, autocomplete, password fields, and security risks.
-
Robots.txt Auditor
Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.
-
Text File Line Ending Converter
Upload or paste text and convert CRLF, CR, and LF endings to a consistent LF or CRLF output locally.
-
Text File Cleaner
Upload a text file and remove BOM, null bytes, trailing spaces, and excessive final blank lines locally.
-
Markdown Link Extractor
Upload Markdown and extract inline links, reference links, images, and bare URLs into a local CSV.
-
HTML Link Extractor
Upload HTML and extract anchors, images, scripts, stylesheets, canonicals, and meta URLs into CSV locally.
-
Morse Code Translator
Text to Morse code and back — encode, decode, audio playback, ITU standard.
Dev Encoding
9-
URL Encoder / Decoder
Encode and decode URL-unsafe characters — query strings, path segments, full URLs — instant, browser-only
-
Base64 Encoder & Decoder
Encode or decode Base64 — text, files, and Data URLs. Runs entirely in your browser.
-
Base32 / Base58 Encoder & Decoder
Base32 + Base58 encoder/decoder — RFC 4648 base32 (Crockford variant too), Bitcoin base58, Solana base58, hex/text/file input.
-
File to Base64 Converter
Upload a small file and convert it to raw Base64 or a data URL locally for embeds, fixtures, and tests.
-
Base64 to File Converter
Paste raw Base64 or a data URL, decode it locally, inspect bytes, and download the reconstructed file.
-
Cron Expression Explainer — Decode Any Cron + Next 20 Runs
Cron expression explainer — paste any cron, get plain English/Chinese + next 20 runs + visual time grid.
-
Crontab Helper — Visual Builder & Explainer
Visual crontab builder + human-readable explanation + next run preview.
-
Timezone Meeting Planner
Plan meetings across timezones — see when everyone's working hours overlap.
-
Batch QR Code Decoder
Drop a folder of QR images and get every decoded URL in one table — fast batch audit for packaging, posters, and print runs.
More
125-
BBCode to HTML Converter
Paste forum BBCode, get safe HTML — live preview, escaped output, one-click copy, all in your browser
-
Cooking Measurement Converter
Cups, spoons, grams, millilitres — and the part that matters, volume ↔ weight by ingredient density, all in your browser
-
CSS to Style Object
Paste CSS declarations, get a React inline style object — kebab keys camelCased, vendor prefixes handled, optional bare numbers, browser-only
-
CSV to HTML Table
Paste CSV, get a clean HTML table, with header toggle, optional class and inline borders, all in your browser
-
CSV to SQL Converter
Turn CSV into CREATE TABLE + INSERT statements — type inference, safe value escaping, MySQL / PostgreSQL / SQLite — browser-only
-
CSV to XML Converter
Turn a CSV table into clean, indented XML — name the root and row elements, columns as elements or attributes, escaped output. Browser-only.
-
CSV to YAML Converter
Turn a spreadsheet export into a clean YAML array of objects — RFC 4180 quoting, optional type inference, browser-only
-
Data Storage Converter
Convert bytes, KB, MB, GB, TB and bits — decimal (1000) and binary (1024, KiB/MiB/GiB) side by side, with the hard-drive 931 GiB gotcha explained — browser-only
-
DOI Deduplicator
Find duplicates and keep one clean copy of dois from pasted text or uploaded local files.
-
DOI Extractor
Extract, dedupe, and export dois from pasted text or uploaded local files.
-
DOI List Converter
Convert dois from pasted text or uploaded local files.
-
DOI List Validator
Validate and explain issues in dois from pasted text or uploaded local files.
-
DOI Normalizer
Normalize, sort, and prepare dois from pasted text or uploaded local files.
-
Domain Name Deduplicator
Find duplicates and keep one clean copy of domain names from pasted text or uploaded local files.
-
Domain Name Extractor
Extract, dedupe, and export domain names from pasted text or uploaded local files.
-
Domain Name List Converter
Convert domain names from pasted text or uploaded local files.
-
Domain Name List Validator
Validate and explain issues in domain names from pasted text or uploaded local files.
-
Domain Name Normalizer
Normalize, sort, and prepare domain names from pasted text or uploaded local files.
-
Email Address Deduplicator
Find duplicates and keep one clean copy of email addresses from pasted text or uploaded local files.
-
Email Address Extractor
Extract, dedupe, and export email addresses from pasted text or uploaded local files.
-
Email Address List Converter
Convert email addresses from pasted text or uploaded local files.
-
Email Address List Validator
Validate and explain issues in email addresses from pasted text or uploaded local files.
-
Email Address Normalizer
Normalize, sort, and prepare email addresses from pasted text or uploaded local files.
-
.env to JSON Converter
Convert .env environment variables to JSON and back, with quote escaping, export prefix, and optional type inference, all in your browser
-
Environment Variable Deduplicator
Find duplicates and keep one clean copy of environment variables from pasted text or uploaded local files.
-
Environment Variable Extractor
Extract, dedupe, and export environment variables from pasted text or uploaded local files.
-
Environment Variable List Converter
Convert environment variables from pasted text or uploaded local files.
-
Environment Variable List Validator
Validate and explain issues in environment variables from pasted text or uploaded local files.
-
Environment Variable Normalizer
Normalize, sort, and prepare environment variables from pasted text or uploaded local files.
-
Hashtag Deduplicator
Find duplicates and keep one clean copy of hashtags from pasted text or uploaded local files.
-
Hashtag Extractor
Extract, dedupe, and export hashtags from pasted text or uploaded local files.
-
Hashtag List Converter
Convert hashtags from pasted text or uploaded local files.
-
Hashtag List Validator
Validate and explain issues in hashtags from pasted text or uploaded local files.
-
Hashtag Normalizer
Normalize, sort, and prepare hashtags from pasted text or uploaded local files.
-
Hex Color Deduplicator
Find duplicates and keep one clean copy of hex colors from pasted text or uploaded local files.
-
Hex Color Extractor
Extract, dedupe, and export hex colors from pasted text or uploaded local files.
-
Hex Color List Converter
Convert hex colors from pasted text or uploaded local files.
-
Hex Color List Validator
Validate and explain issues in hex colors from pasted text or uploaded local files.
-
Hex Color Normalizer
Normalize, sort, and prepare hex colors from pasted text or uploaded local files.
-
HTML Table to JSON
Paste an HTML <table>, get clean JSON, array of objects or 2D array, type inference, browser-only
-
HTML to JSX
Paste HTML, get React-ready JSX — class becomes className, inline styles become objects, tags self-close. Browser-only.
-
HTTP Header Deduplicator
Find duplicates and keep one clean copy of http headers from pasted text or uploaded local files.
-
HTTP Header Extractor
Extract, dedupe, and export http headers from pasted text or uploaded local files.
-
HTTP Header List Converter
Convert http headers from pasted text or uploaded local files.
-
HTTP Header List Validator
Validate and explain issues in http headers from pasted text or uploaded local files.
-
HTTP Header Normalizer
Normalize, sort, and prepare http headers from pasted text or uploaded local files.
-
Image Target Size Compressor
Compress one image to a target KB size locally with quality search, automatic downscaling, preview, and download.
-
INI to JSON Converter
Turn INI / .cfg / .conf into JSON and back, with section nesting, comment stripping and optional type inference, all in your browser
-
IP to Decimal Converter
IPv4 dotted-quad to 32-bit integer, binary and hex, both directions, browser-only
-
IPv4 Address Deduplicator
Find duplicates and keep one clean copy of ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address Extractor
Extract, dedupe, and export ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address List Converter
Convert ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address List Validator
Validate and explain issues in ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address Normalizer
Normalize, sort, and prepare ipv4 addresses from pasted text or uploaded local files.
-
IPv6 Address Deduplicator
Find duplicates and keep one clean copy of ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address Extractor
Extract, dedupe, and export ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address List Converter
Convert ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address List Validator
Validate and explain issues in ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address Normalizer
Normalize, sort, and prepare ipv6 addresses from pasted text or uploaded local files.
-
ISO Date Deduplicator
Find duplicates and keep one clean copy of iso dates from pasted text or uploaded local files.
-
ISO Date Extractor
Extract, dedupe, and export iso dates from pasted text or uploaded local files.
-
ISO Date List Converter
Convert iso dates from pasted text or uploaded local files.
-
ISO Date List Validator
Validate and explain issues in iso dates from pasted text or uploaded local files.
-
ISO Date Normalizer
Normalize, sort, and prepare iso dates from pasted text or uploaded local files.
-
JS Object to JSON
Paste a JS object literal or JSON5, get strict JSON: quote bare keys, swap single quotes, strip comments and trailing commas, runs in your browser
-
JSON Diff
Structural JSON compare — added / removed / changed keys by path, three-colour tree, browser-only
-
JSON to C# Class
JSON to C# class or record — paste JSON, get PascalCase properties with System.Text.Json or Newtonsoft attributes, nested classes, nullable T?, init setters, DateTime detection.
-
JSON to CSV Converter
Turn a JSON array (or object) into clean CSV — flattens nested keys, escapes per RFC 4180, custom delimiter, UTF-8 BOM for Excel — browser-only
-
JSON to Dart Class
JSON to Dart / Flutter class — paste JSON, get final fields, camelCase names, factory fromJson, toJson, null-safe T?, nested classes, and optional @JsonSerializable codegen.
-
JSON to Go Struct
JSON to Go struct — paste JSON, get typed structs with json tags, exported fields, nested sub-structs, pointers for nullable, int64 and omitempty options.
-
JSON to Java Class
JSON to Java POJO, record, or Lombok @Data — paste JSON, get camelCase fields with getters/setters, Jackson @JsonProperty or Gson @SerializedName, nested classes, primitive vs boxed inference.
-
JSON to Kotlin Data Class
JSON to Kotlin data class — paste JSON, get val properties, camelCase fields, nullable T?, nested classes, and kotlinx.serialization @SerialName, Gson @SerializedName, or Moshi @Json annotations.
-
JSON to Markdown Table
Paste a JSON array of objects, get a clean GitHub-flavored Markdown table. Key union, pipe escaping, alignment, all in your browser.
-
JSON to PHP Array
JSON to PHP array — paste JSON, get a clean associative or indexed array with short [] or array() syntax, 2/4 indent, trailing comma, and an optional <?php return …; wrapper.
-
JSON to Protobuf
JSON to Protobuf — paste JSON, get proto3 message definitions with inferred scalar types, incrementing field numbers, snake_case fields, repeated arrays, and named nested messages.
-
JSON to Python Dataclass
JSON to Python — paste JSON, get @dataclass or Pydantic v2 models with type hints, Optional inference, nested classes, snake_case fields and aliases.
-
JSON to Query String Converter
Turn a JSON object into a URL query string — repeat, key[], or comma arrays, bracket-nested objects, sorted, skip-empty — and back to JSON, 100% in your browser
-
JSON to Rust Struct
JSON to Rust struct — paste JSON, get serde-derived structs with snake_case fields, serde rename, Option for nullable, Vec for arrays, nested sub-structs.
-
JSON to Scala
Paste JSON, get Scala case classes. Nested objects become child classes, arrays become List, null becomes Option, all in your browser.
-
JSON to SQL Converter
Turn a JSON array into ready-to-run INSERT statements, MySQL / PostgreSQL / SQLite dialects, browser-only
-
JSON to Swift Codable
JSON to Swift Codable — paste JSON, get struct or class types conforming to Codable, camelCase properties, a CodingKeys enum for non-matching keys, Optional T? for nullable fields, and nested types.
-
JSON to TSV Converter
Turn a JSON array into tab-separated values you can paste straight into Excel or Google Sheets, with header toggle and safe escaping, all in your browser
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JSON to XML Converter
Convert JSON to clean, indented XML — @attr/#text conventions, custom root, escaped output. Browser-only.
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JSON to YAML Converter
Convert JSON to clean YAML — block scalars for multiline strings, optional key sorting, 2/4-space indent, line-numbered errors — browser-only
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List to JSON Array
Turn a column of lines into a JSON array, with type inference, dedupe and pretty print, and split it back to lines, all in your browser
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Markdown Table to CSV
Paste a Markdown pipe table, get RFC 4180 CSV: escaped pipes, quoted commas, comma / semicolon / tab delimiters, all in your browser
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Markdown to JSX
Turn Markdown into React-ready JSX — one paste from README to a real component, with class becoming className and code blocks intact. Browser-only.
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Number to Words
Spell any number in English — cheque amounts, ordinals, British vs American "and" — 100% browser-only
-
Oven Temperature Converter
Convert °F, °C and gas mark instantly — plus the fan-oven setting and the recipe heat band, all in your browser
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Phone Number Deduplicator
Find duplicates and keep one clean copy of phone numbers from pasted text or uploaded local files.
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Phone Number Extractor
Extract, dedupe, and export phone numbers from pasted text or uploaded local files.
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Phone Number List Converter
Convert phone numbers from pasted text or uploaded local files.
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Phone Number List Validator
Validate and explain issues in phone numbers from pasted text or uploaded local files.
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Phone Number Normalizer
Normalize, sort, and prepare phone numbers from pasted text or uploaded local files.
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Postal Code Deduplicator
Find duplicates and keep one clean copy of postal codes from pasted text or uploaded local files.
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Postal Code Extractor
Extract, dedupe, and export postal codes from pasted text or uploaded local files.
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Postal Code List Converter
Convert postal codes from pasted text or uploaded local files.
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Postal Code List Validator
Validate and explain issues in postal codes from pasted text or uploaded local files.
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Postal Code Normalizer
Normalize, sort, and prepare postal codes from pasted text or uploaded local files.
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Properties ⇄ JSON Converter
Java/Spring .properties to JSON and back, with dotted-key nesting, line continuations and full escape handling, all in your browser
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Query String to JSON Converter
Parse a URL query string into JSON and rebuild a query string from JSON — two-way, live, with array + nested object conventions — 100% in your browser
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Semantic Version Deduplicator
Find duplicates and keep one clean copy of semantic versions from pasted text or uploaded local files.
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Semantic Version Extractor
Extract, dedupe, and export semantic versions from pasted text or uploaded local files.
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Semantic Version List Converter
Convert semantic versions from pasted text or uploaded local files.
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Semantic Version List Validator
Validate and explain issues in semantic versions from pasted text or uploaded local files.
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Semantic Version Normalizer
Normalize, sort, and prepare semantic versions from pasted text or uploaded local files.
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Social Handle Deduplicator
Find duplicates and keep one clean copy of social handles from pasted text or uploaded local files.
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Social Handle Extractor
Extract, dedupe, and export social handles from pasted text or uploaded local files.
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Social Handle List Converter
Convert social handles from pasted text or uploaded local files.
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Social Handle List Validator
Validate and explain issues in social handles from pasted text or uploaded local files.
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Social Handle Normalizer
Normalize, sort, and prepare social handles from pasted text or uploaded local files.
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SQL Minifier
Strip comments and whitespace from SQL — collapse to one compact line, string literals stay untouched, runs entirely in your browser.
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SVG to JSX
Paste SVG, get a React component — attributes camelCase, style becomes an object, wrap with {...props} passthrough. Browser-only.
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SVG to PNG Converter
Rasterize SVG to PNG in your browser — custom size, 1×/2×/3× HiDPI scale, true transparent background, never uploaded.
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Temperature Converter
One temperature in, all four scales out — Celsius, Fahrenheit, Kelvin, Rankine — live formula, reference points, browser-only
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TSV to JSON Converter
Tab-separated data to JSON, header detection, type inference, quoted tab/newline fields, browser-only
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URL Deduplicator
Find duplicates and keep one clean copy of urls from pasted text or uploaded local files.
-
URL Extractor
Extract, dedupe, and export urls from pasted text or uploaded local files.
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URL List Converter
Convert urls from pasted text or uploaded local files.
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URL List Validator
Validate and explain issues in urls from pasted text or uploaded local files.
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URL Normalizer
Normalize, sort, and prepare urls from pasted text or uploaded local files.
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Words to Number Converter
Type a number in English or Chinese words, get the digits back — one hundred twenty-three → 123, 一万两千三百 → 12300 — browser-only
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XML to CSV Converter
Turn repeating XML records into a CSV table, columns are the union of every field, attributes optional, custom delimiter, RFC 4180 escaping, browser-only
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XML to YAML Converter
Paste XML, get clean YAML. Attributes as @ keys, repeated tags as lists, mixed text kept, valid YAML 1.2. Browser only.
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YAML to CSV Converter
Turn a YAML list of objects into an RFC 4180 CSV — column union, JSON or flattened nested values, comma / semicolon / tab, browser-only
Generator
Design Assets
33-
CSS Gradient Generator
Visual CSS gradient builder — linear, radial, conic with multi-stop colors, live preview, copy CSS, PNG export.
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Gradient Mesh Generator
Gradient mesh generator — 4-12 control points with bilinear blend, output as SVG, PNG, CSS multi-radial-gradients fallback for older browsers.
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CSS Box Shadow Generator
Visual CSS box-shadow builder — multi-layer, inset, color/blur with live preview.
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CSS Border Radius Generator
Border radius generator — independent 8-corner control + blob shape randomizer, live preview, copy CSS or SVG path.
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CSS Shadow Generator Pro
CSS shadow generator pro — multi-layer box-shadow + text-shadow + filter:drop-shadow, with Material/Tailwind/Apple shadow presets and dark-mode preview.
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CSS Clip-Path Generator
Visual CSS clip-path builder — polygon, circle, ellipse, inset with drag handles.
-
CSS Loaders Generator
CSS loaders — 40+ pure-CSS spinners/skeletons, customize color/size/speed, copy ready-to-use code.
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CSS Transform Generator
CSS transform generator — rotate/scale/skew/translate (2D + 3D) with live preview, copy CSS, 12 preset combos.
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CSS clamp() Fluid Typography Generator
CSS clamp() fluid typography generator — min/max font size, viewport range, full type scale (h1-h6 + body), copy CSS / Tailwind.
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CSS Font Stack Generator
CSS font stack generator — system-safe font families with full Win/Mac/Linux/Android/iOS fallback chains, with CJK fallbacks, copy as CSS/Tailwind/SwiftUI.
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CSS Grid Visual Generator
CSS grid visual generator — drag to set columns/rows, place grid-area named regions, copy ready CSS + HTML, with 12 layout templates.
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Cubic Bezier Editor
CSS cubic-bezier editor — drag two control points, preview live with bouncing ball + scaling box + opacity fade, copy CSS / JS / Framer Motion / GSAP / SVG path.
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Glassmorphism Generator
Glassmorphism CSS generator — backdrop-filter blur + transparency + border, live preview with 8 background presets, copy CSS/Tailwind/SwiftUI.
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Neumorphism Generator
Neumorphism CSS generator — soft-UI inset/outset shadow pair, live light-source direction, 12 presets, copy CSS/Tailwind/SwiftUI.
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Font Pairing Generator
Font pairing generator — 50+ curated Google Fonts pairs (heading + body) with live preview, classifications, CSS export.
-
Favicon Generator
Generate favicon set — text or upload, output 16x16 / 32x32 / 180x180 / 512x512 PNG.
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Avatar Generator
Generate avatars from initials, identicons, or random shapes. Download PNG/SVG.
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Placeholder Image Generator
Generate placeholder images instantly — size, color, text, PNG/JPG/WebP.
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Social Media Aspect Ratio Guide
Social media aspect ratio guide — Instagram / TikTok / YouTube / X / LinkedIn / Xiaohongshu / Bilibili exact pixel dimensions and ratios.
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Image Compressor (Local)
Image compressor — squeeze JPG/PNG/WebP without server upload, with quality slider, batch mode, file size comparison.
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Image Target Size Compressor
Compress one image to a target KB size locally with quality search, automatic downscaling, preview, and download.
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Image Resizer
Image resizer — resize JPG/PNG/WebP by pixels/%/preset, fully client-side, no upload.
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Image Format Converter
Image format converter — JPG ↔ PNG ↔ WebP ↔ AVIF, batch + transparent background handling, 100% client-side.
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Image Cropper
Image cropper — drag to crop, fixed ratios (1:1 / 16:9 / 9:16 / 4:3), zoom, rotate, fully client-side.
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Image Watermark
Image watermark — text or image watermark with position grid, opacity, tile mode, batch processing.
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Image Metadata Inspector
Inspect PNG, JPEG, GIF, WebP, and SVG dimensions, bit depth, ICC, EXIF, XMP, animation, and notes.
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Image EXIF Privacy Scanner
Scan uploaded images for EXIF, GPS, camera, software, dates, XMP, and ICC privacy indicators.
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SVG Asset Auditor
Audit SVG viewBox, dimensions, scripts, external references, styles, ids, classes, title, and desc tags.
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Handwriting Practice Sheet
Handwriting practice sheet generator — Chinese 米字格 / 田字格 / 四线三格 (English) PDF-ready printable.
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Image to ASCII Art
Image to ASCII art — convert any image to text-based art with adjustable density and character set.
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Code Screenshot Generator
Code screenshot generator (Carbon-like) — syntax highlight, beautiful gradient backgrounds, window chrome, export PNG/SVG for X / blog covers.
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GitHub README Badge Generator
GitHub README badge generator — shields.io-style badges, 50+ presets (build/version/license/coverage/etc), custom labels, copy as Markdown/HTML/AsciiDoc/RST.
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SVG Optimizer
SVG optimizer — strip comments/metadata/empty attributes, round path decimals, collapse useless groups, minify in browser. No upload.
Content Creation
19-
Multicultural Name Generator
Random names from 11 cultures — Chinese, English, Japanese, Korean, Arabic, Russian + 5 European.
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Chinese Name Generator
Chinese name generator — meaningful Chinese names with pinyin, meaning, and stroke count.
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Wuxing Name Recommender (Five Elements Naming)
Five Elements (Wuxing) name recommender — based on Bazi gaps, suggest characters that balance the missing elements.
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Slogan Generator
Slogan generator — 30+ proven copywriting formulas, generate brand slogans in seconds, bilingual.
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Headline Analyzer
Headline analyzer — score your title's clickability, SEO length, emotional words, power words.
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Hashtag Generator
Hashtag generator — Instagram / TikTok / Twitter / Xiaohongshu / Weibo hashtags from your topic.
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Cover Letter Generator
Cover letter generator — fill 6 fields, pick a tone, get a tailored cover letter in 4 templates, bilingual.
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Resume Template Builder
Resume template builder — fill a form, get a clean PDF resume in 3 templates (modern / classic / minimal), bilingual.
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Interview Questions Bank
Interview questions bank — 300+ real questions across behavioral / technical / case / culture, with strong answer frameworks.
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Prompt Template Library
200+ prompt templates for ChatGPT, Claude, Gemini — copy-paste, browse by use case.
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Weekly Report Generator
Weekly report generator — fill blanks, get clean markdown, no AI hallucination.
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Invoice Generator
Free invoice generator — clean PDF in your browser, no signup, no watermark.
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ASCII Art Generator
Generate ASCII art from text — figlet-style banners, multiple fonts.
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Lorem Ipsum Generator
Classic Lorem Ipsum filler text — paragraphs, sentences, or words — copy in one click, browser-only
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Meta Description Brief Generator
Generate SEO meta description options from a page topic, keywords, and audience.
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YouTube Title Analyzer
Score a YouTube title for clarity, specificity, length, and keyword position.
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Content Refresh Checklist
Generate a prioritized content refresh checklist from URL, topic, and performance signals.
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System Prompt Builder
Turn role, task, constraints, and output rules into a structured system prompt you can copy.
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LaTeX Equation Editor (Live Preview)
LaTeX equation editor live — type/paste LaTeX, see math rendered live via MathJax 3 (CDN), copy as SVG/PNG/Markdown/MathML, 30+ symbol palette.
IDs & Mocks
12-
UUID Generator
Generate v4 random, v7 time-ordered, NIL, and Short UUIDs instantly — entirely in your browser.
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QR Code Generator
Generate QR codes from text, URL, WiFi or vCard — customize color and size, download as PNG or SVG.
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QR Code Decoder
QR code decoder — drag a QR image or paste URL, see the text/URL inside, plus phishing & risky-link warnings.
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Password Generator
Generate strong, cryptographically random passwords and passphrases — entirely in your browser.
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Password Leak Checker
Password leak checker — check if your password has been seen in known breaches using k-anonymity (HIBP API style), the password never leaves your browser.
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Mock Data Generator
Generate realistic mock JSON / CSV / SQL data — names, emails, dates, addresses, nested objects.
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Random Number Generator
Generate cryptographically-secure random integers — single or batch, with/without duplicates — browser-only
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Meta Tag Generator
Generate SEO meta tags — title, description, Open Graph, Twitter Card, Schema.org.
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.htaccess Generator
Generate Apache .htaccess — HTTPS redirect, www toggle, gzip, cache headers, hotlink protection.
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robots.txt Generator
Generate robots.txt with templates for common crawlers (Google, Bing, AI scrapers).
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UTM Link Builder
UTM link builder — track campaign source, medium, name. GA4/Google Analytics compatible.
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Markdown TOC Generator
Markdown TOC generator — paste your markdown, get a clean table of contents with anchor links.
Puzzle Games
3-
Sudoku Generator
Sudoku generator and solver — 4 difficulties (easy / medium / hard / expert), unique-solution guaranteed, play in the browser or print as PDF.
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2048 Game (Slide, Merge, Reach 2048)
2048 game — slide tiles, combine numbers, reach 2048. Pure browser, no ads, your high score saved locally.
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24-Point Solver & Game
24-point solver and game — enter 4 numbers and get every solution instantly, or play random hands against the clock.
Document Files
9-
Local File Workbench
Triage a mixed batch locally for file type mismatches, duplicate candidates, metadata privacy, archive risks, and next-step tools.
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PDF Merger
PDF merger — combine multiple PDFs into one, drag to reorder pages, 100% client-side with pdf-lib.
-
PDF Splitter
PDF splitter — extract pages or split by range, every page becomes a PDF, 100% client-side with pdf-lib.
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PDF Metadata Extractor
Upload PDFs and extract document metadata, page-count hints, encryption flags, and producer details locally.
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PDF Page Size Inspector
Inspect PDF MediaBox and CropBox dimensions to catch mixed page sizes before print, merge, or upload.
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Office Document Inspector
Inspect DOCX, XLSX, and PPTX package structure for macros, media, embedded objects, custom XML, and size hotspots.
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ZIP Manifest Inspector
Read a ZIP central directory locally and flag traversal paths, encryption, duplicate names, and risky ratios.
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Font File Inspector
Upload TTF or OTF files and extract family names, PostScript names, version, units per em, glyph count, and table list.
-
Batch File Rename Planner
Upload a batch, generate safe new filenames with sequence numbers and case rules, then export a CSV plan.
Fun & Culture
18-
BaZi (Four Pillars) Calculator
BaZi (Four Pillars) calculator — Chinese metaphysics birth chart with 8 characters, five elements analysis.
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Tarot Reading (78-Card Rider-Waite-Smith Deck)
Tarot reading — full 78-card deck, 4 spreads (one-card / three-card / Celtic Cross / love), bilingual interpretations.
-
Western Zodiac Calculator (Sun Sign)
Western zodiac calculator — your sign, element, ruling planet, compatibility, daily traits.
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Chinese Zodiac Fortune (Daily / Monthly / Yearly)
Chinese zodiac fortune — daily/monthly/yearly outlook for 12 zodiac signs in love, career, wealth, health.
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Chinese Zodiac Compatibility (Shengxiao Match)
Chinese zodiac compatibility — match two people by their zodiac signs, 144 pair combinations with reading.
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Fortune Cookie (Daily Bilingual Fortune + Lucky Numbers + Lucky Color)
Daily fortune cookie — bilingual fortunes plus lucky numbers, lucky color, daily affirmation. 365 unique reads.
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Dream Interpretation Dictionary (Zhougong + Jung)
Dream dictionary — search dream symbols and meanings (Chinese 周公解梦 + Jungian).
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Palmistry Guide — 6 Major Lines & 7 Mounts with Diagrams
Palmistry guide — 6 major lines + 7 mounts explained with diagrams, traditional readings, bilingual.
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Chinese Acupoint Locator
200+ meridian acupoints / WHO 2008 standard locations / with contraindications, manipulation, and combinations.
-
Yoga Pose Library
Yoga pose library — 60+ asanas with Sanskrit + Chinese + English names, benefits, contraindications, modifications.
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Cat Breed Finder (10-Question Lifestyle Quiz)
Cat breed finder — answer 10 lifestyle questions, get 5 matching cat breeds with personality, grooming needs, friendliness.
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Dog Breed Finder (10-Question Lifestyle Quiz)
Dog breed finder — answer 10 questions about your lifestyle, get 5 matching breeds with size, temperament, exercise needs.
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Chinese Poetry Search
Chinese classical poetry — 300+ hand-annotated Tang/Song/Yuan canon (唐诗宋词元曲) plus 80,000+ searchable Tang/Song/Shijing/Chuci poems on demand.
-
Chengyu Chain Game
Chengyu chain game with a 30,000+ idiom dictionary (full 汉语成语大词典 coverage). Start with any idiom; the computer continues with one whose first character matches your last.
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Piano Chord Finder
Piano chord finder — type any chord (Cmaj7, F#m, Bdim) and see the keys highlighted on a piano, with notes and inversions.
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Periodic Table
Interactive periodic table — 118 elements, properties, electron config, search.
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Typing Speed Test
Typing speed test — WPM, accuracy, real-time mistakes, English + Chinese pinyin modes.
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Recipe Scaler
Recipe scaler — paste any recipe, change servings, get all ingredient amounts auto-scaled. Handles fractions and unit conversion.
Language Learning
20-
Arabic 500 Essential Words
Arabic 500 essential A1–A2 MSA words — Arabic script with full ḥarakāt, DIN 31635 romanization, gender, three-form verbs, audio TTS.
-
Dutch 500 Essential Words
Dutch 500 essential A1–A2 words — IPA + de/het articles + 6-person conjugation + audio TTS.
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French 600 Essential Words — DELF A1, A2 & B1 Core
600 French words covering the full DELF A1-A2 référentiel plus B1 core — IPA, gender, full Bescherelle conjugation (présent, passé composé, futur simple), free TTS audio, 16 life-context categories.
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German 500 Essential Words
German 500 essential words (A1-A2 + B1 core) with IPA, der/die/das, full Präsens, Präteritum, Perfekt, Partizip II for verbs, and browser TTS.
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Hindi 500 Essential Words
Hindi 500 essential A1–A2 words — Devanagari, IAST, IPA, gender, three-form verbs, audio TTS.
-
Indonesian 500 Essential Words
Indonesian 500 essential A1–A2 words — KBBI spelling + Jakarta IPA + audio TTS. No tones, no conjugation.
-
Italian 500 Essential Words
Italian 500 essential words (A1-A2 Plida) with IPA, gender, full verb conjugation, audio TTS.
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Japanese 500 Essential Words (JLPT N5 + N4)
Japanese 500 essential words covering JLPT N5 and N4, with kana, romaji, kanji and audio TTS.
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Korean 500 Essential Words (TOPIK I–II)
Korean 500 essential words spanning TOPIK I and TOPIK II — start speaking Korean today with Hangul, romanization, audio TTS, and full verb conjugations.
-
Portuguese 500 Essential Words
Portuguese 500 essential words — A1 to A2 Brazilian Portuguese, with IPA, gender, conjugation, audio TTS.
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Russian 500 Essential Words (TORFL A1-A2)
Russian 500 essential words covering the full TORFL A1-A2 syllabus, with Cyrillic, stress marks, BGN/PCGN romanization, gender, full verb conjugation, and audio TTS.
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Spanish 500 Essential Words
Spanish 500 essential A1–A2 words — start speaking Spanish today, with pronunciation, example sentences, verb conjugations and audio TTS.
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Thai 500 Essential Words
Thai 500 essential A1–A2 words — Thai script + RTGS + IPA + 5 tones + audio TTS.
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Turkish 500 Essential Words
Turkish 500 essential A1–A2 words — Istanbul standard + IPA + vowel harmony + audio TTS.
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Vietnamese 500 Essential Words
Vietnamese 500 essential A1–A2 words — chữ Quốc ngữ + IPA + 6 tones + audio TTS.
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English Vocabulary Test
English vocabulary test — estimate your vocab size in 5 minutes, levels CET-4 / CET-6 / IELTS / TOEFL / GRE.
-
HSK Chinese Vocabulary Test
HSK Chinese vocabulary test — estimate your Mandarin level (HSK 1-6) in 5 minutes with real exam words.
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Emoji Finder
Unicode 15.1 / 1500+ emojis with bilingual search — one-click copy, browser-only
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Emoji Recommender
Emoji recommender — paste your headline or post, get matching emoji suggestions.
-
Emoji Kitchen
Emoji mashup — combine two emojis to make a new one (Unicode-only, no Google API, with 500+ pre-defined combos).
More
29-
Barcode Generator
Code 128 / EAN-13 / UPC-A / Code 39 — generate scannable 1D barcodes, export SVG or PNG, fully offline.
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China Marriage Betrothal Reference
China marriage betrothal reference — 30+ provinces' typical betrothal money + dowry + 3-gold/5-gold averages (2024-2026 public data).
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Test Credit Card Number Generator
Luhn-valid fake card numbers for payment-integration testing — Visa, Mastercard, Amex, Discover, JCB, Diners — non-real, sandbox-only — browser-side
-
Dice Roller
Roll D4-D100 + 3d6+2 notation, advantage/disadvantage — fair CSPRNG, browser-only
-
Diceware Passphrase Generator
Cryptographically secure word-based passphrases — pick word count, separator, casing; live entropy; 100% in-browser, never in the URL.
-
Email Signature Generator
Fill in your details, pick a template, get table-based inline-style HTML that pastes cleanly into Gmail and Outlook — 100% browser-only
-
Fancy Text Generator
Turn plain text into 25 Unicode styles — bold, italic, script, fraktur, double-struck, circled, squared, fullwidth, upside-down, small caps, strikethrough — copy & paste anywhere, browser-only
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Hashtag Deduplicator
Find duplicates and keep one clean copy of hashtags from pasted text or uploaded local files.
-
Hashtag Extractor
Extract, dedupe, and export hashtags from pasted text or uploaded local files.
-
Hashtag List Converter
Convert hashtags from pasted text or uploaded local files.
-
Hashtag List Validator
Validate and explain issues in hashtags from pasted text or uploaded local files.
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Hashtag Normalizer
Normalize, sort, and prepare hashtags from pasted text or uploaded local files.
-
HTML Table Generator
Build an HTML table visually — rows/columns, header cells, alignment, borders, zebra stripes, paste CSV/TSV — copy clean markup, browser-only
-
Kanji & Chinese Character Stroke Order Viewer
Kanji + Chinese character stroke order viewer — animated SVG showing correct stroke sequence + direction, with romaji/pinyin/meaning, 500+ common characters.
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List Randomizer
Shuffle a list, pick N at random, split into K teams, or draw one winner — fair crypto randomness, browser-only
-
Online Metronome
Rock-steady practice metronome — tap tempo, time signatures, accented downbeat, subdivisions. Web Audio, nothing recorded, nothing uploaded.
-
NanoID Generator
Generate URL-safe NanoIDs with a custom alphabet, adjustable length, and a live collision-probability readout — entirely in your browser.
-
Number Sequence Generator
Generate a list of numbers from start to end by step or count, with zero-padding, prefix, suffix and any separator, all in your browser
-
Open Graph & Social Card Preview
See your og:title, og:image and twitter:card exactly as Google, X, Facebook, LinkedIn, Slack and Discord will render them — before you ship.
-
Random Line Picker
Paste a list, pick N lines at random with crypto-grade fairness, draw raffle winners, copy in one click, all in your browser
-
Regex Builder from Examples
Regex from examples — paste positive matches + negative non-matches, get a regex that hits all positives and rejects all negatives, with multiple candidate patterns ranked by specificity.
-
Regex Visualizer
Regex visualizer — see your pattern as a railroad diagram + matching state machine, with capture groups highlighted.
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Social Handle Deduplicator
Find duplicates and keep one clean copy of social handles from pasted text or uploaded local files.
-
Social Handle Extractor
Extract, dedupe, and export social handles from pasted text or uploaded local files.
-
Social Handle List Converter
Convert social handles from pasted text or uploaded local files.
-
Social Handle List Validator
Validate and explain issues in social handles from pasted text or uploaded local files.
-
Social Handle Normalizer
Normalize, sort, and prepare social handles from pasted text or uploaded local files.
-
ULID Generator
Sortable, URL-safe unique IDs — batch generate, monotonic mode, decode the timestamp back out — 100% in your browser
-
WiFi QR Code Generator
Turn your WiFi name + password into a scan-to-connect QR code — WPA/WPA2/WPA3, WEP or open, hidden networks, PNG/SVG export. Password never leaves the tab.
Color & Design
Palette & Color
5-
Color Converter
HEX ⇄ RGB ⇄ HSL ⇄ HSV ⇄ CMYK — instant 5-way conversion, live swatch — browser-only
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HTML Color Names
HTML named colors — all 147 CSS color names with hex/RGB/HSL, searchable + sortable.
-
Font Pairing Generator
Font pairing generator — 50+ curated Google Fonts pairs (heading + body) with live preview, classifications, CSS export.
-
WCAG Color Contrast Fixer
WCAG color contrast fixer — input fg/bg, get current ratio, auto-suggest 4 fixed colors hitting AA/AAA while preserving hue.
-
Gradient Mesh Generator
Gradient mesh generator — 4-12 control points with bilinear blend, output as SVG, PNG, CSS multi-radial-gradients fallback for older browsers.
Blend & Mix
6-
CSS Gradient Generator
Visual CSS gradient builder — linear, radial, conic with multi-stop colors, live preview, copy CSS, PNG export.
-
CSS Box Shadow Generator
Visual CSS box-shadow builder — multi-layer, inset, color/blur with live preview.
-
Color Mixer
Color mixer — blend any two colors with adjustable ratio, RGB/HSL/LAB color space, predict the result and copy hex.
-
CSS Border Radius Generator
Border radius generator — independent 8-corner control + blob shape randomizer, live preview, copy CSS or SVG path.
-
CSS Transform Generator
CSS transform generator — rotate/scale/skew/translate (2D + 3D) with live preview, copy CSS, 12 preset combos.
-
Emoji Kitchen
Emoji mashup — combine two emojis to make a new one (Unicode-only, no Google API, with 500+ pre-defined combos).
Accessibility
2CSS Design
10-
CSS Grid Generator
CSS Grid generator — visually design grid layouts (rows/cols/gap/areas), copy CSS code, fully responsive.
-
CSS Grid Visual Generator
CSS grid visual generator — drag to set columns/rows, place grid-area named regions, copy ready CSS + HTML, with 12 layout templates.
-
CSS clamp() Fluid Typography Generator
CSS clamp() fluid typography generator — min/max font size, viewport range, full type scale (h1-h6 + body), copy CSS / Tailwind.
-
CSS Font Stack Generator
CSS font stack generator — system-safe font families with full Win/Mac/Linux/Android/iOS fallback chains, with CJK fallbacks, copy as CSS/Tailwind/SwiftUI.
-
CSS Shadow Generator Pro
CSS shadow generator pro — multi-layer box-shadow + text-shadow + filter:drop-shadow, with Material/Tailwind/Apple shadow presets and dark-mode preview.
-
CSS Loaders Generator
CSS loaders — 40+ pure-CSS spinners/skeletons, customize color/size/speed, copy ready-to-use code.
-
CSS Clip-Path Generator
Visual CSS clip-path builder — polygon, circle, ellipse, inset with drag handles.
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Tailwind CSS Cheatsheet
Tailwind CSS cheat sheet — 100+ utility classes (spacing, color, flex, grid, typography, responsive) with live preview.
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Social Media Aspect Ratio Guide
Social media aspect ratio guide — Instagram / TikTok / YouTube / X / LinkedIn / Xiaohongshu / Bilibili exact pixel dimensions and ratios.
-
Piano Chord Finder
Piano chord finder — type any chord (Cmaj7, F#m, Bdim) and see the keys highlighted on a piano, with notes and inversions.
More
29-
Color Shades Generator
Turn one base color into a Tailwind-style 50–950 tint & shade scale — copy each step, export to Tailwind / CSS / SCSS / JSON — browser-only
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CSS Button Generator
Design buttons that look pressable — 3D raised, neumorphic, glass — with a live preview you can hover & press, plus full :hover/:active CSS export
-
CSS Filter Generator
Dial in blur, brightness, contrast, grayscale, sepia, hue-rotate, saturate, invert, opacity + drop-shadow with live preview — copy the filter string
-
CSS Keyframes Animation Generator
Visually build @keyframes — edit keyframes, set transform/opacity/color, live-preview, and copy production-ready CSS — browser-only
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CSS Media Query Generator
CSS @media query + responsive breakpoint generator — Tailwind / Bootstrap / Material presets, mobile-first vs desktop-first, dark mode, hover, reduced-motion, aspect-ratio.
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CSS Pattern Generator
Pure-CSS geometric backgrounds — dots, grid, stripes, checkerboard, diagonal, cross — live preview, one-click copy, zero images
-
CSS Scrollbar Generator
Design custom scrollbars visually — exports WebKit + Firefox-standard CSS, live preview, one-click copy — browser-only
-
CSS Specificity Calculator
Score any CSS selector as an (a, b, c) triple, compare which rule wins the cascade, and see exactly which digit decided it — browser-only
-
CSS Text Gradient Generator
Paint a gradient INTO your text with background-clip: text — live preview, font size/weight, copy cross-browser CSS with -webkit- prefixes.
-
CSS Triangle Generator
Pure-CSS triangles via the border trick — 8 directions, live preview, copy both border + clip-path CSS — browser-only
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CSS Variable Deduplicator
Find duplicates and keep one clean copy of css variables from pasted text or uploaded local files.
-
CSS Variable Extractor
Extract, dedupe, and export css variables from pasted text or uploaded local files.
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CSS Variable List Converter
Convert css variables from pasted text or uploaded local files.
-
CSS Variable List Validator
Validate and explain issues in css variables from pasted text or uploaded local files.
-
CSS Variable Normalizer
Normalize, sort, and prepare css variables from pasted text or uploaded local files.
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Flexbox Playground & CSS Generator
Flexbox playground — toggle every container and item property on a real flex box and copy the exact CSS. direction, justify, align, gap, order, grow/shrink/basis, align-self. 100% client-side.
-
Golden Ratio Calculator
Split any length by φ = 1.618 — long/short segments, golden sequence, font scale, layout columns, golden rectangle — browser-only
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Hex Color Deduplicator
Find duplicates and keep one clean copy of hex colors from pasted text or uploaded local files.
-
Hex Color Extractor
Extract, dedupe, and export hex colors from pasted text or uploaded local files.
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Hex Color List Converter
Convert hex colors from pasted text or uploaded local files.
-
Hex Color List Validator
Validate and explain issues in hex colors from pasted text or uploaded local files.
-
Hex Color Normalizer
Normalize, sort, and prepare hex colors from pasted text or uploaded local files.
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Image Cropper
Image cropper — drag to crop, fixed ratios (1:1 / 16:9 / 9:16 / 4:3), zoom, rotate, fully client-side.
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Image Format Converter
Image format converter — JPG ↔ PNG ↔ WebP ↔ AVIF, batch + transparent background handling, 100% client-side.
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Image Resizer
Image resizer — resize JPG/PNG/WebP by pixels/%/preset, fully client-side, no upload.
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Image Watermark
Image watermark — text or image watermark with position grid, opacity, tile mode, batch processing.
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SVG Blob Generator
Generate smooth organic blob shapes — adjustable complexity, randomness, seed — export SVG / CSS clip-path — 100% browser-only
-
SVG Wave Generator
Generate smooth SVG wave dividers for landing pages — adjustable waves, amplitude, layers, seed — flip top/bottom — export SVG / CSS — browser-only
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Type Scale Generator
Pick a base size + ratio (Major Third, Perfect Fourth, Golden…) and get a full modular type scale with px + rem, live preview, and CSS / Tailwind / SCSS export — browser-only
Image
Image Tools
17-
Base64 Image Converter
Image ⇄ Base64 — drag-drop PNG/JPG/WebP/SVG, get data URI for CSS / HTML / Markdown.
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Favicon Generator
Generate favicon set — text or upload, output 16x16 / 32x32 / 180x180 / 512x512 PNG.
-
Placeholder Image Generator
Generate placeholder images instantly — size, color, text, PNG/JPG/WebP.
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Avatar Generator
Generate avatars from initials, identicons, or random shapes. Download PNG/SVG.
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Aspect Ratio Calculator
Calculate aspect ratio — fix any 1 of [width, height, ratio], get the other two.
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Image Compressor (Local)
Image compressor — squeeze JPG/PNG/WebP without server upload, with quality slider, batch mode, file size comparison.
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Image Target Size Compressor
Compress one image to a target KB size locally with quality search, automatic downscaling, preview, and download.
-
Image Resizer
Image resizer — resize JPG/PNG/WebP by pixels/%/preset, fully client-side, no upload.
-
Image Format Converter
Image format converter — JPG ↔ PNG ↔ WebP ↔ AVIF, batch + transparent background handling, 100% client-side.
-
Image Cropper
Image cropper — drag to crop, fixed ratios (1:1 / 16:9 / 9:16 / 4:3), zoom, rotate, fully client-side.
-
Image Watermark
Image watermark — text or image watermark with position grid, opacity, tile mode, batch processing.
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Local File Workbench
Triage a mixed batch locally for file type mismatches, duplicate candidates, metadata privacy, archive risks, and next-step tools.
-
Image Metadata Inspector
Inspect PNG, JPEG, GIF, WebP, and SVG dimensions, bit depth, ICC, EXIF, XMP, animation, and notes.
-
Image EXIF Privacy Scanner
Scan uploaded images for EXIF, GPS, camera, software, dates, XMP, and ICC privacy indicators.
-
SVG Asset Auditor
Audit SVG viewBox, dimensions, scripts, external references, styles, ids, classes, title, and desc tags.
-
SVG Optimizer
SVG optimizer — strip comments/metadata/empty attributes, round path decimals, collapse useless groups, minify in browser. No upload.
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Code Screenshot Generator
Code screenshot generator (Carbon-like) — syntax highlight, beautiful gradient backgrounds, window chrome, export PNG/SVG for X / blog covers.
More
9-
CSS Shadow Generator Pro
CSS shadow generator pro — multi-layer box-shadow + text-shadow + filter:drop-shadow, with Material/Tailwind/Apple shadow presets and dark-mode preview.
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Glassmorphism Generator
Glassmorphism CSS generator — backdrop-filter blur + transparency + border, live preview with 8 background presets, copy CSS/Tailwind/SwiftUI.
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Gradient Mesh Generator
Gradient mesh generator — 4-12 control points with bilinear blend, output as SVG, PNG, CSS multi-radial-gradients fallback for older browsers.
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Image to PDF
Image to PDF — combine JPG, PNG & WebP into one PDF, drag to reorder, pick A4/Letter/fit-to-image, 100% in your browser.
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Neumorphism Generator
Neumorphism CSS generator — soft-UI inset/outset shadow pair, live light-source direction, 12 presets, copy CSS/Tailwind/SwiftUI.
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SVG Blob Generator
Generate smooth organic blob shapes — adjustable complexity, randomness, seed — export SVG / CSS clip-path — 100% browser-only
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SVG to Data URI / CSS Background
Inline any SVG as a data URI — URL-encoded (smaller) or base64 — with ready-to-paste CSS, HTML and bare-URI output, side-by-side size diff, 100% in-browser.
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SVG to PNG Converter
Rasterize SVG to PNG in your browser — custom size, 1×/2×/3× HiDPI scale, true transparent background, never uploaded.
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SVG Wave Generator
Generate smooth SVG wave dividers for landing pages — adjustable waves, amplitude, layers, seed — flip top/bottom — export SVG / CSS — browser-only
Encoding & Crypto
Hash & Crypto
8-
MD5 / SHA Hash Generator
Compute MD5 / SHA-1 / SHA-256 / SHA-384 / SHA-512 hashes — all five at once, browser-only
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Local File Workbench
Triage a mixed batch locally for file type mismatches, duplicate candidates, metadata privacy, archive risks, and next-step tools.
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File Hash Calculator
Compute SHA-1, SHA-256, SHA-384, or SHA-512 hashes for uploaded files entirely in the browser.
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File Checksum Compare
Paste an expected checksum, upload a file, and verify SHA digest matches locally before installing or sharing.
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Duplicate File Finder
Upload a batch and find exact duplicate files by SHA hash locally, with a Markdown cleanup report.
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Bcrypt Generator
bcrypt password hash generator + verifier — pick rounds, hash and compare in browser.
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JWT Decoder
Decode JWT header / payload / signature — verify structure, check exp, copy claims — browser-only
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JWT Encoder
Encode JWT — pick algorithm (HS256/HS384/HS512), set header/payload/secret, get token.
Passwords
3-
Password Generator
Generate strong, cryptographically random passwords and passphrases — entirely in your browser.
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Password Strength Checker
Check password strength — entropy, time-to-crack, breach pattern check (offline).
-
Password Leak Checker
Password leak checker — check if your password has been seen in known breaches using k-anonymity (HIBP API style), the password never leaves your browser.
Encoding & Binary
9-
Base64 Encoder & Decoder
Encode or decode Base64 — text, files, and Data URLs. Runs entirely in your browser.
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Base64 Image Converter
Image ⇄ Base64 — drag-drop PNG/JPG/WebP/SVG, get data URI for CSS / HTML / Markdown.
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File to Base64 Converter
Upload a small file and convert it to raw Base64 or a data URL locally for embeds, fixtures, and tests.
-
Base64 to File Converter
Paste raw Base64 or a data URL, decode it locally, inspect bytes, and download the reconstructed file.
-
URL Encoder / Decoder
Encode and decode URL-unsafe characters — query strings, path segments, full URLs — instant, browser-only
-
HTML Entities Encoder
Encode/decode HTML entities — & < > " ' and all numeric refs — browser-only
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ROT13 Encoder & Decoder
ROT13 / ROT47 / Caesar cipher — encode and decode in your browser, instant.
-
Text to Binary Converter
Text to binary (and back) — UTF-8 aware, 8/16/32 bit grouping, emoji safe.
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QR Code Generator
Generate QR codes from text, URL, WiFi or vCard — customize color and size, download as PNG or SVG.
More
48-
AES Text Encryptor
Encrypt & decrypt text with a password — AES-256-GCM + PBKDF2 via WebCrypto — 100% in your browser, nothing uploaded
-
Base32 / Base58 Encoder & Decoder
Base32 + Base58 encoder/decoder — RFC 4648 base32 (Crockford variant too), Bitcoin base58, Solana base58, hex/text/file input.
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Base64 Block Deduplicator
Find duplicates and keep one clean copy of base64 blocks from pasted text or uploaded local files.
-
Base64 Block Extractor
Extract, dedupe, and export base64 blocks from pasted text or uploaded local files.
-
Base64 Block List Converter
Convert base64 blocks from pasted text or uploaded local files.
-
Base64 Block List Validator
Validate and explain issues in base64 blocks from pasted text or uploaded local files.
-
Base64 Block Normalizer
Normalize, sort, and prepare base64 blocks from pasted text or uploaded local files.
-
Base64 to Hex Converter
Base64 ⇄ hexadecimal at the byte level, no text encoding in between — standard or URL-safe, your separator and case, runs in your browser
-
Base85 / Ascii85 Encoder & Decoder
Encode text to Ascii85 or Z85 and decode it back, UTF-8 safe, with z-compression and <~ ~> handling, all in your browser
-
Caesar Cipher Encoder & Decoder
Encrypt, decrypt and brute-force a Caesar shift cipher — all 25 shifts at once, ROT13 shortcut, browser-only
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Credit Card Number Deduplicator
Find duplicates and keep one clean copy of credit card numbers from pasted text or uploaded local files.
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Credit Card Number Extractor
Extract, dedupe, and export credit card numbers from pasted text or uploaded local files.
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Credit Card Number List Converter
Convert credit card numbers from pasted text or uploaded local files.
-
Credit Card Number List Validator
Validate and explain issues in credit card numbers from pasted text or uploaded local files.
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Credit Card Number Normalizer
Normalize, sort, and prepare credit card numbers from pasted text or uploaded local files.
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CSP Policy Auditor
Inspect Content-Security-Policy directives for unsafe sources, missing fallbacks, framing gaps, object-src, base-uri, and reporting coverage.
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Diceware Passphrase Generator
Cryptographically secure word-based passphrases — pick word count, separator, casing; live entropy; 100% in-browser, never in the URL.
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Email Obfuscator
Hide your email from scraper bots — HTML entities, [at]/[dot] text, ROT13+JS link — browser-only, one-click copy
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ENV Secret Scanner
Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.
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Hex Dump Viewer
Offset, hex bytes and ASCII side by side, the classic xxd / hexdump -C layout, fully in your browser
-
HMAC Generator
HMAC-SHA1/256/384/512 — message + secret key, output in hex and base64, key read as UTF-8/hex/base64 — 100% in-browser
-
.htpasswd Generator
Generate Apache/Nginx .htpasswd lines — bcrypt, apr1 (MD5), SHA-1 — multi-user, copy, download — 100% browser-only
-
HTTP Security Header Auditor
Audit raw response headers for HSTS, CSP, cookie flags, MIME sniffing, clickjacking, referrer, and permissions policy gaps.
-
Image EXIF Privacy Scanner
Scan uploaded images for EXIF, GPS, camera, software, dates, XMP, and ICC privacy indicators.
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JWT Token Deduplicator
Find duplicates and keep one clean copy of jwt tokens from pasted text or uploaded local files.
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JWT Token Extractor
Extract, dedupe, and export jwt tokens from pasted text or uploaded local files.
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JWT Token List Converter
Convert jwt tokens from pasted text or uploaded local files.
-
JWT Token List Validator
Validate and explain issues in jwt tokens from pasted text or uploaded local files.
-
JWT Token Normalizer
Normalize, sort, and prepare jwt tokens from pasted text or uploaded local files.
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MAC Address Deduplicator
Find duplicates and keep one clean copy of mac addresses from pasted text or uploaded local files.
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MAC Address Extractor
Extract, dedupe, and export mac addresses from pasted text or uploaded local files.
-
MAC Address List Converter
Convert mac addresses from pasted text or uploaded local files.
-
MAC Address List Validator
Validate and explain issues in mac addresses from pasted text or uploaded local files.
-
MAC Address Normalizer
Normalize, sort, and prepare mac addresses from pasted text or uploaded local files.
-
Package Lock Dependency Auditor
Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.
-
Punycode / IDN Converter
Unicode ⇄ Punycode for internationalized domains — münchen.de ⇄ xn--mnchen-3ya.de — per-label, email-aware, browser-only
-
Batch QR Code Decoder
Drop a folder of QR images and get every decoded URL in one table — fast batch audit for packaging, posters, and print runs.
-
Rail Fence Cipher Encoder & Decoder
Encrypt, decrypt and brute-force a rail fence zigzag cipher, with a live grid, rail count plus offset, browser-only
-
String Escape / Unescape
Escape & unescape strings for JSON, JS, Java, C, SQL, Shell, HTML, CSV & regex — both directions — browser-only
-
Text to Hex Converter
Text ⇄ hexadecimal by UTF-8 bytes — Chinese and emoji safe, picks your separator and case, decodes messy pasted hex — runs in your browser
-
Unicode Escape Converter
Text ⇄ Unicode escapes — \uXXXX, \u{1F600}, 😀, CSS \1F600 — emoji + CJK done right, browser-only
-
UUID Deduplicator
Find duplicates and keep one clean copy of uuids from pasted text or uploaded local files.
-
UUID Extractor
Extract, dedupe, and export uuids from pasted text or uploaded local files.
-
UUID List Converter
Convert uuids from pasted text or uploaded local files.
-
UUID List Validator
Validate and explain issues in uuids from pasted text or uploaded local files.
-
UUID Normalizer
Normalize, sort, and prepare uuids from pasted text or uploaded local files.
-
Vigenère Cipher Encoder / Decoder
Encrypt and decrypt with a keyword, polyalphabetic shift, case kept, non-letters passed through, browser-only
-
ZIP Manifest Inspector
Read a ZIP central directory locally and flag traversal paths, encryption, duplicate names, and risky ratios.
Developer & DevOps
Cheatsheets
29-
Bash Cheatsheet
Bash cheat sheet — 100+ commands & idioms for variables, conditionals, loops, functions, pipes, traps, with real one-liners.
-
awk + sed Cheatsheet
awk + sed cheat sheet — 80+ one-liners for text processing, with real examples and common pitfalls.
-
Vim Cheatsheet
Vim cheat sheet — 100+ commands covering modes, motions, edits, search, registers, splits, with mnemonics.
-
curl Cheatsheet
curl cheat sheet — 80+ curl commands for GET/POST/auth/upload/download/SSL/proxy, with real examples and pitfalls.
-
Git Cheatsheet
Git command cheat sheet — searchable, with explanations, common mistakes, and real examples.
-
Docker Cheatsheet
Docker command cheat sheet — 80+ commands with real examples, common mistakes, and Compose section.
-
kubectl Cheatsheet
kubectl cheat sheet — 100+ Kubernetes commands with real examples, common pitfalls, and YAML snippets.
-
Nginx Cheatsheet
Nginx cheat sheet — common configs, location/server blocks, SSL, reverse proxy, gzip, real examples & gotchas.
-
AWS CLI Cheatsheet
AWS CLI cheat sheet — 80+ commands for EC2 / S3 / IAM / Lambda / RDS / EKS / CloudFormation with real examples.
-
Python Cheatsheet
Python cheat sheet — 100+ idiomatic Python snippets for string, list, dict, file, async, with real examples.
-
Go (Golang) Cheatsheet
Go (Golang) cheat sheet — 100+ idiomatic snippets covering syntax, goroutines, channels, generics, errors, stdlib.
-
Rust Cheatsheet
Rust cheat sheet — 100+ snippets covering ownership, borrowing, lifetimes, traits, async, error handling.
-
TypeScript Cheatsheet
TypeScript cheat sheet — 100+ snippets for types, generics, utility types, narrowing, async patterns.
-
React Hooks Cheatsheet
React hooks cheat sheet — all 17 built-in hooks (useState / useEffect / useMemo / useTransition / useFormStatus...) with real examples and pitfalls.
-
Next.js Cheatsheet
Next.js 15 cheat sheet — App Router, Server Components, Server Actions, dynamic routes, with examples and pitfalls.
-
Vue 3 Cheatsheet
Vue 3 cheat sheet — Composition API, reactivity, components, directives, Pinia, with side-by-side Options API comparison.
-
Svelte Cheatsheet
Svelte 5 cheat sheet — runes ($state, $derived, $effect), snippets, props, stores, with Svelte 4 comparison.
-
Tailwind CSS Cheatsheet
Tailwind CSS cheat sheet — 100+ utility classes (spacing, color, flex, grid, typography, responsive) with live preview.
-
npm / yarn / pnpm Cheatsheet
npm / yarn / pnpm cheat sheet — 80+ commands across init, install, scripts, publish, with cross-tool comparison.
-
Markdown Cheat Sheet
Markdown syntax cheat sheet — every rule with live preview side by side, GFM + flavors.
-
SQL Cheatsheet
SQL cheat sheet — 100+ statements covering SELECT, JOIN, window functions, indexing, MySQL/PostgreSQL/SQLite differences.
-
Redis Cheatsheet
Redis cheat sheet — 80+ commands across strings, hashes, lists, sets, sorted sets, pub/sub, streams, scripts, with examples and pitfalls.
-
MongoDB Cheatsheet
MongoDB cheat sheet — 80+ shell commands & query operators for CRUD, aggregation, indexing, replication.
-
PostgreSQL Cheatsheet
PostgreSQL cheat sheet — 80+ commands & functions for psql, JSONB, CTEs, window functions, indexing, partitioning, advanced extensions.
-
Elasticsearch Cheatsheet
Elasticsearch cheat sheet — 80+ Query DSL, mapping, analyzer, aggregation, replication, with real examples.
-
Regex Cheatsheet
Interactive regex cheat sheet — quick reference for every flavor (JS, Python, PCRE).
-
HTTP Status Code Explorer
HTTP status code explorer — all 70+ codes with meaning, common causes, real examples, and what to check.
-
DNS Record Explainer
DNS record explainer — all 18 common record types (A, AAAA, CNAME, MX, TXT, SRV, etc.) with syntax, examples, and gotchas.
-
Chinese Idiom Search
800+ everyday chengyu — pinyin, origin, usage.
Formatters
48-
JSON Formatter & Validator
Format, validate, and minify JSON instantly — right in your browser.
-
XML Formatter & Validator
Pretty-print, minify, and validate XML in your browser — preserves CDATA, comments, and namespaces.
-
YAML Formatter & Validator
Format and beautify YAML — re-indent, validate, minify, sort keys.
-
SQL Formatter
Format and beautify SQL — supports MySQL, PostgreSQL, BigQuery, SQLite and 17 more dialects.
-
CSS Formatter & Minifier
Format and beautify CSS — sort properties, indent rules, expand or minify.
-
INI Formatter & Validator
Format and validate INI / TOML-like config — sort sections, align equal signs.
-
HTML Minifier
Minify HTML — strip comments, whitespace, optional attributes, inline CSS/JS. 40-60% smaller.
-
CSS Minifier
Minify CSS — strip comments, whitespace, shorten colors, merge selectors. 30-60% smaller.
-
JS Minifier
Minify JavaScript — strip comments, whitespace, optional name shortening. 40-70% smaller.
-
JS Obfuscator
Lightly obfuscate JavaScript in the browser: strip comments, remove debugger/console calls, and optionally wrap strings with base64.
-
JSON Minifier
Minify JSON into a compact single line, optionally sort object keys, and keep everything local.
-
JSON Lines Formatter
Validate JSONL line by line, pretty-print it, convert to a JSON array, or export a CSV-like table locally.
-
JSON to TypeScript Interface
JSON to TypeScript interface — paste JSON, get clean interfaces with union types from arrays, optional vs required detection, root name customizable.
-
JSON Schema Inferencer
Paste JSON or NDJSON samples and infer a Draft 2020-12 style schema with types, required fields, formats, enums, and examples.
-
TOML Formatter + Converter
TOML formatter + converter — format/validate TOML 1.0, convert TOML ↔ JSON ↔ YAML, with error line/column.
-
GraphQL Formatter & Minifier
GraphQL formatter + minifier — beautify query/mutation/subscription/schema, validate syntax, copy minified single-line for HTTP body.
-
OpenAPI Endpoint Auditor
Audit OpenAPI JSON or YAML for endpoint coverage, missing operation IDs, security gaps, and weak response documentation.
-
Package Lock Dependency Auditor
Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.
-
Markdown to HTML
Convert Markdown to clean HTML — headings, lists, code, links, images, tables — instant live preview, browser-only
-
HTML to Markdown
HTML to Markdown — paste rich content, get clean .md with links, code, tables, lists preserved.
-
Markdown Editor with Live Preview
Markdown editor with live split-pane preview — GFM tables, fenced code with syntax highlight, math, emoji, table of contents, export as HTML / PDF-ready.
-
Markdown Table Generator
Build Markdown tables visually — add/remove rows, column alignment, paste from Excel / CSV — browser-only
-
CSV ⇄ JSON Converter
Convert CSV to JSON or JSON to CSV — handles quoted commas, newlines in cells, custom delimiter — browser-only
-
CSV to Markdown Table
Convert uploaded or pasted CSV into clean Markdown tables with quoted-cell support, locally in the browser.
-
CSV to TSV Converter
Convert CSV files to tab-separated values while preserving quoted commas, quotes, and multiline cells locally.
-
TSV to CSV Converter
Turn tab-separated files into standards-friendly CSV with proper quoting, download, and local processing.
-
CSV Deduplicator
Remove duplicate CSV rows by full row or selected key columns from uploaded files, locally and safely.
-
CSV Column Extractor
Upload or paste CSV, keep only selected columns by name or index, and export a smaller privacy-safe file.
-
CSV Sorter
Sort uploaded CSV rows by a selected column with numeric-aware ordering and local-only processing.
-
CSV Filter
Filter uploaded CSV rows by column value using contains, equals, or regex, with local browser processing.
-
CSV Transposer
Flip CSV rows and columns from uploaded files or pasted data, with ragged-row handling and local output.
-
CSV Header Normalizer
Standardize CSV header rows to snake_case, kebab-case, camelCase, or Title Case before imports and scripts.
-
CSV Stats Summary
Upload CSV and get a quick Markdown profile of filled, missing, unique, numeric, min, max, and average values.
-
CSV Data Quality Profiler
Upload CSV or TSV and profile missing values, inferred types, invalid cells, duplicate rows, whitespace issues, top values, and numeric outliers.
-
Local File Workbench
Triage a mixed batch locally for file type mismatches, duplicate candidates, metadata privacy, archive risks, and next-step tools.
-
File MIME Type Inspector
Upload files and inspect filename, size, browser MIME type, extension, and magic-byte signature locally.
-
Text File Line Ending Converter
Upload or paste text and convert CRLF, CR, and LF endings to a consistent LF or CRLF output locally.
-
Text File Cleaner
Upload a text file and remove BOM, null bytes, trailing spaces, and excessive final blank lines locally.
-
Markdown Link Extractor
Upload Markdown and extract inline links, reference links, images, and bare URLs into a local CSV.
-
HTML Link Extractor
Upload HTML and extract anchors, images, scripts, stylesheets, canonicals, and meta URLs into CSV locally.
-
Batch File Rename Planner
Upload a batch, generate safe new filenames with sequence numbers and case rules, then export a CSV plan.
-
PDF Metadata Extractor
Upload PDFs and extract document metadata, page-count hints, encryption flags, and producer details locally.
-
PDF Page Size Inspector
Inspect PDF MediaBox and CropBox dimensions to catch mixed page sizes before print, merge, or upload.
-
Office Document Inspector
Inspect DOCX, XLSX, and PPTX package structure for macros, media, embedded objects, custom XML, and size hotspots.
-
ZIP Manifest Inspector
Read a ZIP central directory locally and flag traversal paths, encryption, duplicate names, and risky ratios.
-
Font File Inspector
Upload TTF or OTF files and extract family names, PostScript names, version, units per em, glyph count, and table list.
-
XML ⇄ JSON Converter
XML to JSON converter — preserves attributes, nested elements, CDATA. Reversible.
-
YAML ⇄ JSON Converter
Convert between YAML and JSON — both directions, pretty-printed, error messages with line numbers — browser-only
Encoding & Crypto
17-
MD5 / SHA Hash Generator
Compute MD5 / SHA-1 / SHA-256 / SHA-384 / SHA-512 hashes — all five at once, browser-only
-
File Hash Calculator
Compute SHA-1, SHA-256, SHA-384, or SHA-512 hashes for uploaded files entirely in the browser.
-
File Checksum Compare
Paste an expected checksum, upload a file, and verify SHA digest matches locally before installing or sharing.
-
Duplicate File Finder
Upload a batch and find exact duplicate files by SHA hash locally, with a Markdown cleanup report.
-
File to Base64 Converter
Upload a small file and convert it to raw Base64 or a data URL locally for embeds, fixtures, and tests.
-
Base64 to File Converter
Paste raw Base64 or a data URL, decode it locally, inspect bytes, and download the reconstructed file.
-
Bcrypt Generator
bcrypt password hash generator + verifier — pick rounds, hash and compare in browser.
-
JWT Decoder
Decode JWT header / payload / signature — verify structure, check exp, copy claims — browser-only
-
JWT Encoder
Encode JWT — pick algorithm (HS256/HS384/HS512), set header/payload/secret, get token.
-
ENV Secret Scanner
Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.
-
HTML Entities Encoder
Encode/decode HTML entities — & < > " ' and all numeric refs — browser-only
-
Base32 / Base58 Encoder & Decoder
Base32 + Base58 encoder/decoder — RFC 4648 base32 (Crockford variant too), Bitcoin base58, Solana base58, hex/text/file input.
-
Number Base Converter
Number base converter — binary, octal, decimal, hex, and any base 2-36. Bitwise too.
-
Color Converter
HEX ⇄ RGB ⇄ HSL ⇄ HSV ⇄ CMYK — instant 5-way conversion, live swatch — browser-only
-
Color Blindness Simulator
Color blindness simulator — paste hex or upload image, see how it looks to people with protanopia / deuteranopia / tritanopia / monochromacy.
-
Color Contrast Checker
Color contrast checker — WCAG 2.2 AA/AAA compliance for normal/large text, real-time grade.
-
HTML Color Names
HTML named colors — all 147 CSS color names with hex/RGB/HSL, searchable + sortable.
Web & Frontend
46-
CSS Grid Generator
CSS Grid generator — visually design grid layouts (rows/cols/gap/areas), copy CSS code, fully responsive.
-
CSS Grid Visual Generator
CSS grid visual generator — drag to set columns/rows, place grid-area named regions, copy ready CSS + HTML, with 12 layout templates.
-
CSS clamp() Fluid Typography Generator
CSS clamp() fluid typography generator — min/max font size, viewport range, full type scale (h1-h6 + body), copy CSS / Tailwind.
-
CSS Font Stack Generator
CSS font stack generator — system-safe font families with full Win/Mac/Linux/Android/iOS fallback chains, with CJK fallbacks, copy as CSS/Tailwind/SwiftUI.
-
CSS Shadow Generator Pro
CSS shadow generator pro — multi-layer box-shadow + text-shadow + filter:drop-shadow, with Material/Tailwind/Apple shadow presets and dark-mode preview.
-
CSS Transform Generator
CSS transform generator — rotate/scale/skew/translate (2D + 3D) with live preview, copy CSS, 12 preset combos.
-
Cubic Bezier Editor
CSS cubic-bezier editor — drag two control points, preview live with bouncing ball + scaling box + opacity fade, copy CSS / JS / Framer Motion / GSAP / SVG path.
-
Glassmorphism Generator
Glassmorphism CSS generator — backdrop-filter blur + transparency + border, live preview with 8 background presets, copy CSS/Tailwind/SwiftUI.
-
Gradient Mesh Generator
Gradient mesh generator — 4-12 control points with bilinear blend, output as SVG, PNG, CSS multi-radial-gradients fallback for older browsers.
-
Image Target Size Compressor
Compress one image to a target KB size locally with quality search, automatic downscaling, preview, and download.
-
Image Resizer
Image resizer — resize JPG/PNG/WebP by pixels/%/preset, fully client-side, no upload.
-
Image Format Converter
Image format converter — JPG ↔ PNG ↔ WebP ↔ AVIF, batch + transparent background handling, 100% client-side.
-
Image Cropper
Image cropper — drag to crop, fixed ratios (1:1 / 16:9 / 9:16 / 4:3), zoom, rotate, fully client-side.
-
Image Watermark
Image watermark — text or image watermark with position grid, opacity, tile mode, batch processing.
-
Image Metadata Inspector
Inspect PNG, JPEG, GIF, WebP, and SVG dimensions, bit depth, ICC, EXIF, XMP, animation, and notes.
-
Image EXIF Privacy Scanner
Scan uploaded images for EXIF, GPS, camera, software, dates, XMP, and ICC privacy indicators.
-
SVG Asset Auditor
Audit SVG viewBox, dimensions, scripts, external references, styles, ids, classes, title, and desc tags.
-
Code Screenshot Generator
Code screenshot generator (Carbon-like) — syntax highlight, beautiful gradient backgrounds, window chrome, export PNG/SVG for X / blog covers.
-
Image Compressor (Local)
Image compressor — squeeze JPG/PNG/WebP without server upload, with quality slider, batch mode, file size comparison.
-
Meta Tag Generator
Generate SEO meta tags — title, description, Open Graph, Twitter Card, Schema.org.
-
QR Code Decoder
QR code decoder — drag a QR image or paste URL, see the text/URL inside, plus phishing & risky-link warnings.
-
Batch QR Code Decoder
Drop a folder of QR images and get every decoded URL in one table — fast batch audit for packaging, posters, and print runs.
-
Regex Builder from Examples
Regex from examples — paste positive matches + negative non-matches, get a regex that hits all positives and rejects all negatives, with multiple candidate patterns ranked by specificity.
-
Regex Visualizer
Regex visualizer — see your pattern as a railroad diagram + matching state machine, with capture groups highlighted.
-
Regex Tester
Test JavaScript regex live — match highlighting, group capture, replace preview, flag toggles — browser-only
-
Text Diff
Compare two blocks of text — line-by-line additions, deletions, equal — colour highlighted, browser-only
-
Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, Title Case, UPPER, lower — instant, browser-only
-
URL Slug Generator
Turn any title into a clean URL slug — lowercase, dashes, ASCII-safe transliteration, multiline batch — browser-only
-
Email Validator
Validate emails — RFC 5321 syntax + bulk paste + disposable detection + MX hint.
-
UTM Link Builder
UTM link builder — track campaign source, medium, name. GA4/Google Analytics compatible.
-
UUID Generator
Generate v4 random, v7 time-ordered, NIL, and Short UUIDs instantly — entirely in your browser.
-
Mock Data Generator
Generate realistic mock JSON / CSV / SQL data — names, emails, dates, addresses, nested objects.
-
PX REM EM Converter
CSS px ↔ rem ↔ em converter — visual scale, base font size adjustable.
-
HTML Table to CSV Converter
HTML table to CSV converter — paste HTML or full page source, extract all tables, get CSV/TSV/JSON/Excel-ready output with header detection + colspan/rowspan handling.
-
HTML Form Extractor
Upload or paste HTML and extract forms, methods, actions, fields, labels, required flags, autocomplete, password fields, and security risks.
-
URL Query Params Extractor
Extract, deduplicate, inspect, copy, and export query parameters from one URL or many URLs locally.
-
TypeScript to Zod Schema
TypeScript to Zod schema converter — paste interface/type, get z.object() schema, supports unions/optionals/nested/generics/enum/Record/Map/Set.
-
.env File Validator
.env file validator — parse Bash-style .env, detect dups / missing required / unsafe values / leaked secret patterns; cross-compare prod / staging / dev envs.
-
OpenAPI Endpoint Auditor
Audit OpenAPI JSON or YAML for endpoint coverage, missing operation IDs, security gaps, and weak response documentation.
-
Robots.txt Auditor
Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.
-
HTTP Security Header Auditor
Audit raw response headers for HSTS, CSP, cookie flags, MIME sniffing, clickjacking, referrer, and permissions policy gaps.
-
CSP Policy Auditor
Inspect Content-Security-Policy directives for unsafe sources, missing fallbacks, framing gaps, object-src, base-uri, and reporting coverage.
-
Package Lock Dependency Auditor
Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.
-
ENV Secret Scanner
Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.
-
HAR Performance Analyzer
Upload a Chrome DevTools HAR file and get a local performance, cache, host, asset, status, and security-header report.
-
Sitemap URL Auditor
Paste sitemap XML and audit URL count, HTTP links, duplicates, trailing-slash conflicts, query parameters, lastmod freshness, and extensions.
Ops & DevOps
16-
.htaccess Generator
Generate Apache .htaccess — HTTPS redirect, www toggle, gzip, cache headers, hotlink protection.
-
robots.txt Generator
Generate robots.txt with templates for common crawlers (Google, Bing, AI scrapers).
-
Cron Expression Explainer — Decode Any Cron + Next 20 Runs
Cron expression explainer — paste any cron, get plain English/Chinese + next 20 runs + visual time grid.
-
Crontab Helper — Visual Builder & Explainer
Visual crontab builder + human-readable explanation + next run preview.
-
Linux Permission (chmod) Calculator
Linux permission (chmod) calculator — convert between octal (755), symbolic (rwxr-xr-x), and ls -l forms, with safety warnings.
-
Unix Timestamp Converter
Unix timestamp ⇄ human date — seconds / milliseconds / ISO 8601 — UTC and local — browser-only
-
Log Line Cleaner
Clean noisy logs by removing timestamps, ANSI colors, blank lines, long lines, or non-error entries in your browser.
-
Log Error Analyzer
Paste logs and group repeated errors, warnings, stack traces, HTTP statuses, endpoint patterns, and time ranges into a local incident report.
-
ENV Secret Scanner
Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.
-
Package Lock Dependency Auditor
Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.
-
OpenAPI Endpoint Auditor
Audit OpenAPI JSON or YAML for endpoint coverage, missing operation IDs, security gaps, and weak response documentation.
-
Robots.txt Auditor
Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.
-
HTTP Security Header Auditor
Audit raw response headers for HSTS, CSP, cookie flags, MIME sniffing, clickjacking, referrer, and permissions policy gaps.
-
CSP Policy Auditor
Inspect Content-Security-Policy directives for unsafe sources, missing fallbacks, framing gaps, object-src, base-uri, and reporting coverage.
-
HAR Performance Analyzer
Upload a Chrome DevTools HAR file and get a local performance, cache, host, asset, status, and security-header report.
-
Sitemap URL Auditor
Paste sitemap XML and audit URL count, HTTP links, duplicates, trailing-slash conflicts, query parameters, lastmod freshness, and extensions.
More
163-
AI Eval Planner
Generate eval cases, pass criteria, and edge cases from an AI feature, risks, and user path.
-
ASCII Table Generator
Paste CSV or TSV, get a monospace table that lines up: +--+ ASCII, Unicode box, Markdown, with real CJK width
-
ASCII Table Reference
Complete 0–127 ASCII table: decimal, hex, octal, binary, character, name, HTML entity and escape — control codes explained, click to copy, fully searchable.
-
Barcode Generator
Code 128 / EAN-13 / UPC-A / Code 39 — generate scannable 1D barcodes, export SVG or PNG, fully offline.
-
Base64 Block Deduplicator
Find duplicates and keep one clean copy of base64 blocks from pasted text or uploaded local files.
-
Base64 Block Extractor
Extract, dedupe, and export base64 blocks from pasted text or uploaded local files.
-
Base64 Block List Converter
Convert base64 blocks from pasted text or uploaded local files.
-
Base64 Block List Validator
Validate and explain issues in base64 blocks from pasted text or uploaded local files.
-
Base64 Block Normalizer
Normalize, sort, and prepare base64 blocks from pasted text or uploaded local files.
-
Base64 to Hex Converter
Base64 ⇄ hexadecimal at the byte level, no text encoding in between — standard or URL-safe, your separator and case, runs in your browser
-
CSS Border Radius Generator
Border radius generator — independent 8-corner control + blob shape randomizer, live preview, copy CSS or SVG path.
-
Column Align
Pad delimited rows into an even monospace grid, like column -t, with correct CJK width — browser-only
-
Credit Card Number Deduplicator
Find duplicates and keep one clean copy of credit card numbers from pasted text or uploaded local files.
-
Credit Card Number Extractor
Extract, dedupe, and export credit card numbers from pasted text or uploaded local files.
-
Credit Card Number List Converter
Convert credit card numbers from pasted text or uploaded local files.
-
Credit Card Number List Validator
Validate and explain issues in credit card numbers from pasted text or uploaded local files.
-
Credit Card Number Normalizer
Normalize, sort, and prepare credit card numbers from pasted text or uploaded local files.
-
Test Credit Card Number Generator
Luhn-valid fake card numbers for payment-integration testing — Visa, Mastercard, Amex, Discover, JCB, Diners — non-real, sandbox-only — browser-side
-
CSS Button Generator
Design buttons that look pressable — 3D raised, neumorphic, glass — with a live preview you can hover & press, plus full :hover/:active CSS export
-
CSS Filter Generator
Dial in blur, brightness, contrast, grayscale, sepia, hue-rotate, saturate, invert, opacity + drop-shadow with live preview — copy the filter string
-
CSS Keyframes Animation Generator
Visually build @keyframes — edit keyframes, set transform/opacity/color, live-preview, and copy production-ready CSS — browser-only
-
CSS Media Query Generator
CSS @media query + responsive breakpoint generator — Tailwind / Bootstrap / Material presets, mobile-first vs desktop-first, dark mode, hover, reduced-motion, aspect-ratio.
-
CSS Scrollbar Generator
Design custom scrollbars visually — exports WebKit + Firefox-standard CSS, live preview, one-click copy — browser-only
-
CSS Specificity Calculator
Score any CSS selector as an (a, b, c) triple, compare which rule wins the cascade, and see exactly which digit decided it — browser-only
-
CSS to Style Object
Paste CSS declarations, get a React inline style object — kebab keys camelCased, vendor prefixes handled, optional bare numbers, browser-only
-
CSS Triangle Generator
Pure-CSS triangles via the border trick — 8 directions, live preview, copy both border + clip-path CSS — browser-only
-
CSS Variable Deduplicator
Find duplicates and keep one clean copy of css variables from pasted text or uploaded local files.
-
CSS Variable Extractor
Extract, dedupe, and export css variables from pasted text or uploaded local files.
-
CSS Variable List Converter
Convert css variables from pasted text or uploaded local files.
-
CSS Variable List Validator
Validate and explain issues in css variables from pasted text or uploaded local files.
-
CSS Variable Normalizer
Normalize, sort, and prepare css variables from pasted text or uploaded local files.
-
CSV to SQL Converter
Turn CSV into CREATE TABLE + INSERT statements — type inference, safe value escaping, MySQL / PostgreSQL / SQLite — browser-only
-
CSV to XML Converter
Turn a CSV table into clean, indented XML — name the root and row elements, columns as elements or attributes, escaped output. Browser-only.
-
CSV to YAML Converter
Turn a spreadsheet export into a clean YAML array of objects — RFC 4180 quoting, optional type inference, browser-only
-
curl to Code Converter
Paste a curl command, get JS fetch / Python requests / Node axios / PHP cURL / Go net/http — parsed locally, instant
-
Domain Name Deduplicator
Find duplicates and keep one clean copy of domain names from pasted text or uploaded local files.
-
Domain Name Extractor
Extract, dedupe, and export domain names from pasted text or uploaded local files.
-
Domain Name List Converter
Convert domain names from pasted text or uploaded local files.
-
Domain Name List Validator
Validate and explain issues in domain names from pasted text or uploaded local files.
-
Domain Name Normalizer
Normalize, sort, and prepare domain names from pasted text or uploaded local files.
-
.editorconfig Generator
Visual .editorconfig builder — indent, charset, line endings, trailing whitespace, per-glob overrides — browser-only
-
Email Address Deduplicator
Find duplicates and keep one clean copy of email addresses from pasted text or uploaded local files.
-
Email Address Extractor
Extract, dedupe, and export email addresses from pasted text or uploaded local files.
-
Email Address List Converter
Convert email addresses from pasted text or uploaded local files.
-
Email Address List Validator
Validate and explain issues in email addresses from pasted text or uploaded local files.
-
Email Address Normalizer
Normalize, sort, and prepare email addresses from pasted text or uploaded local files.
-
Email Obfuscator
Hide your email from scraper bots — HTML entities, [at]/[dot] text, ROT13+JS link — browser-only, one-click copy
-
Email Signature Generator
Fill in your details, pick a template, get table-based inline-style HTML that pastes cleanly into Gmail and Outlook — 100% browser-only
-
.env to JSON Converter
Convert .env environment variables to JSON and back, with quote escaping, export prefix, and optional type inference, all in your browser
-
Environment Variable Deduplicator
Find duplicates and keep one clean copy of environment variables from pasted text or uploaded local files.
-
Environment Variable Extractor
Extract, dedupe, and export environment variables from pasted text or uploaded local files.
-
Environment Variable List Converter
Convert environment variables from pasted text or uploaded local files.
-
Environment Variable List Validator
Validate and explain issues in environment variables from pasted text or uploaded local files.
-
Environment Variable Normalizer
Normalize, sort, and prepare environment variables from pasted text or uploaded local files.
-
Filename Sanitizer
Strip illegal characters and make any string a safe cross-platform filename, in your browser
-
Find and Replace Text
Batch find-and-replace on big text — regex, $1 capture groups, whole-word, case toggle, multiple chained rules — runs entirely in your browser
-
Flexbox Playground & CSS Generator
Flexbox playground — toggle every container and item property on a real flex box and copy the exact CSS. direction, justify, align, gap, order, grow/shrink/basis, align-self. 100% client-side.
-
GitHub README Badge Generator
GitHub README badge generator — shields.io-style badges, 50+ presets (build/version/license/coverage/etc), custom labels, copy as Markdown/HTML/AsciiDoc/RST.
-
.gitignore Generator
Pick your stack — Node, Python, Go, Docker, macOS, VS Code — and get a deduped, sectioned .gitignore. Browser-only.
-
Hex Dump Viewer
Offset, hex bytes and ASCII side by side, the classic xxd / hexdump -C layout, fully in your browser
-
HMAC Generator
HMAC-SHA1/256/384/512 — message + secret key, output in hex and base64, key read as UTF-8/hex/base64 — 100% in-browser
-
HTML Formatter
Beautify minified or messy HTML into clean indented markup, browser-only
-
HTML Table Generator
Build an HTML table visually — rows/columns, header cells, alignment, borders, zebra stripes, paste CSV/TSV — copy clean markup, browser-only
-
HTML Table to JSON
Paste an HTML <table>, get clean JSON, array of objects or 2D array, type inference, browser-only
-
HTML to JSX
Paste HTML, get React-ready JSX — class becomes className, inline styles become objects, tags self-close. Browser-only.
-
.htpasswd Generator
Generate Apache/Nginx .htpasswd lines — bcrypt, apr1 (MD5), SHA-1 — multi-user, copy, download — 100% browser-only
-
HTTP Header Deduplicator
Find duplicates and keep one clean copy of http headers from pasted text or uploaded local files.
-
HTTP Header Extractor
Extract, dedupe, and export http headers from pasted text or uploaded local files.
-
HTTP Header List Converter
Convert http headers from pasted text or uploaded local files.
-
HTTP Header List Validator
Validate and explain issues in http headers from pasted text or uploaded local files.
-
HTTP Header Normalizer
Normalize, sort, and prepare http headers from pasted text or uploaded local files.
-
INI to JSON Converter
Turn INI / .cfg / .conf into JSON and back, with section nesting, comment stripping and optional type inference, all in your browser
-
IP Subnet Calculator (CIDR)
Type an IPv4 CIDR and get network, broadcast, host range, mask, wildcard, class and subnet splits — browser-only.
-
IP to Decimal Converter
IPv4 dotted-quad to 32-bit integer, binary and hex, both directions, browser-only
-
IPv4 Address Deduplicator
Find duplicates and keep one clean copy of ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address Extractor
Extract, dedupe, and export ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address List Converter
Convert ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address List Validator
Validate and explain issues in ipv4 addresses from pasted text or uploaded local files.
-
IPv4 Address Normalizer
Normalize, sort, and prepare ipv4 addresses from pasted text or uploaded local files.
-
IPv6 Address Deduplicator
Find duplicates and keep one clean copy of ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address Extractor
Extract, dedupe, and export ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address List Converter
Convert ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address List Validator
Validate and explain issues in ipv6 addresses from pasted text or uploaded local files.
-
IPv6 Address Normalizer
Normalize, sort, and prepare ipv6 addresses from pasted text or uploaded local files.
-
JS Object to JSON
Paste a JS object literal or JSON5, get strict JSON: quote bare keys, swap single quotes, strip comments and trailing commas, runs in your browser
-
JSON Diff
Structural JSON compare — added / removed / changed keys by path, three-colour tree, browser-only
-
JSON Flatten / Unflatten
Flatten nested JSON to dot-notation keys and unflatten it back — choose the delimiter and array style, types preserved, browser-only.
-
JSON Sort Keys
Sort JSON object keys alphabetically, recurse into nested objects, asc or desc, values untouched, runs in your browser
-
JSON to C# Class
JSON to C# class or record — paste JSON, get PascalCase properties with System.Text.Json or Newtonsoft attributes, nested classes, nullable T?, init setters, DateTime detection.
-
JSON to CSV Converter
Turn a JSON array (or object) into clean CSV — flattens nested keys, escapes per RFC 4180, custom delimiter, UTF-8 BOM for Excel — browser-only
-
JSON to Dart Class
JSON to Dart / Flutter class — paste JSON, get final fields, camelCase names, factory fromJson, toJson, null-safe T?, nested classes, and optional @JsonSerializable codegen.
-
JSON to Go Struct
JSON to Go struct — paste JSON, get typed structs with json tags, exported fields, nested sub-structs, pointers for nullable, int64 and omitempty options.
-
JSON to Java Class
JSON to Java POJO, record, or Lombok @Data — paste JSON, get camelCase fields with getters/setters, Jackson @JsonProperty or Gson @SerializedName, nested classes, primitive vs boxed inference.
-
JSON to Kotlin Data Class
JSON to Kotlin data class — paste JSON, get val properties, camelCase fields, nullable T?, nested classes, and kotlinx.serialization @SerialName, Gson @SerializedName, or Moshi @Json annotations.
-
JSON to Markdown Table
Paste a JSON array of objects, get a clean GitHub-flavored Markdown table. Key union, pipe escaping, alignment, all in your browser.
-
JSON to PHP Array
JSON to PHP array — paste JSON, get a clean associative or indexed array with short [] or array() syntax, 2/4 indent, trailing comma, and an optional <?php return …; wrapper.
-
JSON to Protobuf
JSON to Protobuf — paste JSON, get proto3 message definitions with inferred scalar types, incrementing field numbers, snake_case fields, repeated arrays, and named nested messages.
-
JSON to Python Dataclass
JSON to Python — paste JSON, get @dataclass or Pydantic v2 models with type hints, Optional inference, nested classes, snake_case fields and aliases.
-
JSON to Query String Converter
Turn a JSON object into a URL query string — repeat, key[], or comma arrays, bracket-nested objects, sorted, skip-empty — and back to JSON, 100% in your browser
-
JSON to Rust Struct
JSON to Rust struct — paste JSON, get serde-derived structs with snake_case fields, serde rename, Option for nullable, Vec for arrays, nested sub-structs.
-
JSON to Scala
Paste JSON, get Scala case classes. Nested objects become child classes, arrays become List, null becomes Option, all in your browser.
-
JSON to SQL Converter
Turn a JSON array into ready-to-run INSERT statements, MySQL / PostgreSQL / SQLite dialects, browser-only
-
JSON to Swift Codable
JSON to Swift Codable — paste JSON, get struct or class types conforming to Codable, camelCase properties, a CodingKeys enum for non-matching keys, Optional T? for nullable fields, and nested types.
-
JSON to TSV Converter
Turn a JSON array into tab-separated values you can paste straight into Excel or Google Sheets, with header toggle and safe escaping, all in your browser
-
JSON to XML Converter
Convert JSON to clean, indented XML — @attr/#text conventions, custom root, escaped output. Browser-only.
-
JSON to YAML Converter
Convert JSON to clean YAML — block scalars for multiline strings, optional key sorting, 2/4-space indent, line-numbered errors — browser-only
-
JSONPath / JMESPath Query Tester
JSONPath / JMESPath query tester — paste JSON, write a path, see matched values + matched paths highlighted live.
-
JWT Token Deduplicator
Find duplicates and keep one clean copy of jwt tokens from pasted text or uploaded local files.
-
JWT Token Extractor
Extract, dedupe, and export jwt tokens from pasted text or uploaded local files.
-
JWT Token List Converter
Convert jwt tokens from pasted text or uploaded local files.
-
JWT Token List Validator
Validate and explain issues in jwt tokens from pasted text or uploaded local files.
-
JWT Token Normalizer
Normalize, sort, and prepare jwt tokens from pasted text or uploaded local files.
-
List Comparison
Compare two lists line by line: only in A, only in B, in both, and merged — all in your browser
-
List to JSON Array
Turn a column of lines into a JSON array, with type inference, dedupe and pretty print, and split it back to lines, all in your browser
-
LLM Pricing Calculator
Estimate daily and monthly LLM spend from tokens, request volume, and editable model prices.
-
MAC Address Deduplicator
Find duplicates and keep one clean copy of mac addresses from pasted text or uploaded local files.
-
MAC Address Extractor
Extract, dedupe, and export mac addresses from pasted text or uploaded local files.
-
MAC Address List Converter
Convert mac addresses from pasted text or uploaded local files.
-
MAC Address List Validator
Validate and explain issues in mac addresses from pasted text or uploaded local files.
-
MAC Address Normalizer
Normalize, sort, and prepare mac addresses from pasted text or uploaded local files.
-
Markdown to JSX
Turn Markdown into React-ready JSX — one paste from README to a real component, with class becoming className and code blocks intact. Browser-only.
-
MIME Type Lookup
File extension ⇄ MIME type lookup — 130+ types, both directions, copy the exact Content-Type — browser-only
-
NanoID Generator
Generate URL-safe NanoIDs with a custom alphabet, adjustable length, and a live collision-probability readout — entirely in your browser.
-
Number Sequence Generator
Generate a list of numbers from start to end by step or count, with zero-padding, prefix, suffix and any separator, all in your browser
-
Open Graph & Social Card Preview
See your og:title, og:image and twitter:card exactly as Google, X, Facebook, LinkedIn, Slack and Discord will render them — before you ship.
-
Password Strength Checker
Check password strength — entropy, time-to-crack, breach pattern check (offline).
-
Properties ⇄ JSON Converter
Java/Spring .properties to JSON and back, with dotted-key nesting, line continuations and full escape handling, all in your browser
-
Punycode / IDN Converter
Unicode ⇄ Punycode for internationalized domains — münchen.de ⇄ xn--mnchen-3ya.de — per-label, email-aware, browser-only
-
Query String to JSON Converter
Parse a URL query string into JSON and rebuild a query string from JSON — two-way, live, with array + nested object conventions — 100% in your browser
-
Regex Escape
Turn literal text into a safe regex pattern: a.b becomes a\.b, copy the ready /…/ form, reverse it too, all in your browser
-
Semantic Version Deduplicator
Find duplicates and keep one clean copy of semantic versions from pasted text or uploaded local files.
-
Semantic Version Extractor
Extract, dedupe, and export semantic versions from pasted text or uploaded local files.
-
Semantic Version List Converter
Convert semantic versions from pasted text or uploaded local files.
-
Semantic Version List Validator
Validate and explain issues in semantic versions from pasted text or uploaded local files.
-
Semantic Version Normalizer
Normalize, sort, and prepare semantic versions from pasted text or uploaded local files.
-
SQL Minifier
Strip comments and whitespace from SQL — collapse to one compact line, string literals stay untouched, runs entirely in your browser.
-
String Escape / Unescape
Escape & unescape strings for JSON, JS, Java, C, SQL, Shell, HTML, CSV & regex — both directions — browser-only
-
String Similarity Checker
Levenshtein edit distance, Dice, Jaro-Winkler and LCS side by side, with a 0-100% match score, all in your browser
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SVG Optimizer
SVG optimizer — strip comments/metadata/empty attributes, round path decimals, collapse useless groups, minify in browser. No upload.
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SVG to Data URI / CSS Background
Inline any SVG as a data URI — URL-encoded (smaller) or base64 — with ready-to-paste CSS, HTML and bare-URI output, side-by-side size diff, 100% in-browser.
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SVG to JSX
Paste SVG, get a React component — attributes camelCase, style becomes an object, wrap with {...props} passthrough. Browser-only.
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Tabs to Spaces Converter
Convert tabs to spaces and spaces to tabs, real tab-stop alignment, leading-indent or whole-line, all in your browser
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TSV to JSON Converter
Tab-separated data to JSON, header detection, type inference, quoted tab/newline fields, browser-only
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Type Scale Generator
Pick a base size + ratio (Major Third, Perfect Fourth, Golden…) and get a full modular type scale with px + rem, live preview, and CSS / Tailwind / SCSS export — browser-only
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ULID Generator
Sortable, URL-safe unique IDs — batch generate, monotonic mode, decode the timestamp back out — 100% in your browser
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Unicode Character Inspector
Inspect any text character-by-character: code points, UTF-8/UTF-16 bytes, HTML entities, JS escapes, names, and hidden zero-width / confusable glyphs.
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Unicode Normalizer
Normalize text to NFC, NFD, NFKC or NFKD, see code-point and byte counts shift, spot which characters changed, copy in one click, all in your browser
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URL Deduplicator
Find duplicates and keep one clean copy of urls from pasted text or uploaded local files.
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URL Extractor
Extract, dedupe, and export urls from pasted text or uploaded local files.
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URL List Converter
Convert urls from pasted text or uploaded local files.
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URL List Validator
Validate and explain issues in urls from pasted text or uploaded local files.
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URL Normalizer
Normalize, sort, and prepare urls from pasted text or uploaded local files.
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URL Parser
Break any URL into protocol, host, port, path, query and hash, with a decoded parameter table, all in your browser
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User-Agent Parser
Parse any User-Agent string into browser, engine, OS, device type and bot flag — paste a log line or read your own — browser-only
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UTF-8 Byte Counter
Count UTF-8 bytes, UTF-16 code units, Unicode code points and characters in any string, right in your browser
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UUID Deduplicator
Find duplicates and keep one clean copy of uuids from pasted text or uploaded local files.
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UUID Extractor
Extract, dedupe, and export uuids from pasted text or uploaded local files.
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UUID List Converter
Convert uuids from pasted text or uploaded local files.
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UUID List Validator
Validate and explain issues in uuids from pasted text or uploaded local files.
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UUID Normalizer
Normalize, sort, and prepare uuids from pasted text or uploaded local files.
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XML to CSV Converter
Turn repeating XML records into a CSV table, columns are the union of every field, attributes optional, custom delimiter, RFC 4180 escaping, browser-only
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XML to YAML Converter
Paste XML, get clean YAML. Attributes as @ keys, repeated tags as lists, mixed text kept, valid YAML 1.2. Browser only.
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YAML to CSV Converter
Turn a YAML list of objects into an RFC 4180 CSV — column union, JSON or flattened nested values, comma / semicolon / tab, browser-only
PDF & Document
PDF Edit
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Local File Workbench
Triage a mixed batch locally for file type mismatches, duplicate candidates, metadata privacy, archive risks, and next-step tools.
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PDF Merger
PDF merger — combine multiple PDFs into one, drag to reorder pages, 100% client-side with pdf-lib.
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PDF Splitter
PDF splitter — extract pages or split by range, every page becomes a PDF, 100% client-side with pdf-lib.
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PDF Metadata Extractor
Upload PDFs and extract document metadata, page-count hints, encryption flags, and producer details locally.
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PDF Page Size Inspector
Inspect PDF MediaBox and CropBox dimensions to catch mixed page sizes before print, merge, or upload.
AI Tools
AI Utility
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AI Token Counter
AI token counter — estimate token count for GPT / Claude / Gemini, with per-model cost calculator (2026 pricing).
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AI Model Comparison
AI model comparison — 20+ models (GPT / Claude / Gemini / Llama / Qwen) across price, context, speed, capabilities (2026).
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Prompt Template Library
200+ prompt templates for ChatGPT, Claude, Gemini — copy-paste, browse by use case.
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System Prompt Builder
Turn role, task, constraints, and output rules into a structured system prompt you can copy.
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AI Eval Planner
Generate eval cases, pass criteria, and edge cases from an AI feature, risks, and user path.
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LLM Pricing Calculator
Estimate daily and monthly LLM spend from tokens, request volume, and editable model prices.