Tools for Marketer
191 hand-picked tools for Marketer. Free, private, browser-based.
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Age Calculator
Calculate your exact age — years, months, days, hours. Compare two dates or count to a future date.
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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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Annuity Calculator
Annuity & retirement calculator — see monthly income from your savings, accumulation + payout phases, multiple scenarios.
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Avatar Generator
Generate avatars from initials, identicons, or random shapes. Download PNG/SVG.
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Barcode Generator
Code 128 / EAN-13 / UPC-A / Code 39 — generate scannable 1D barcodes, export SVG or PNG, fully offline.
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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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Batch File Rename Planner
Upload a batch, generate safe new filenames with sequence numbers and case rules, then export a CSV plan.
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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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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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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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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.
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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 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 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 Unemployment Benefits Calculator
China unemployment benefits calculator — monthly amount + total months by city + insurance years, per 2026 policy.
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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.
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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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Chinese Idiom Search
800+ everyday chengyu — pinyin, origin, usage.
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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 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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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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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 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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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.
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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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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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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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Chinese Zodiac Sign Checker (Sheng Xiao)
Chinese zodiac checker — your animal sign, element, compatibility, lucky numbers/colors by birth year.
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Churn Rate Calculator
Churned ÷ starting customers = churn % — retention, monthly→annual, average lifetime, optional MRR churn — 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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Color Converter
HEX ⇄ RGB ⇄ HSL ⇄ HSV ⇄ CMYK — instant 5-way conversion, live swatch — browser-only
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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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Western Zodiac Calculator (Sun Sign)
Western zodiac calculator — your sign, element, ruling planet, compatibility, daily traits.
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Content Refresh Checklist
Generate a prioritized content refresh checklist from URL, topic, and performance signals.
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Conversion Rate Calculator
Conversions / visitors, solve for any of the three, plus A/B uplift and visitors needed for a goal. 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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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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CPM Calculator
CPM = ad spend ÷ impressions × 1000 — solve for spend, impressions or CPM, plus CPC, CTR and CPA off the same budget — browser-only
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CSS Minifier
Minify CSS — strip comments, whitespace, shorten colors, merge selectors. 30-60% smaller.
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CSV Column Extractor
Upload or paste CSV, keep only selected columns by name or index, and export a smaller privacy-safe file.
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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.
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CSV Deduplicator
Remove duplicate CSV rows by full row or selected key columns from uploaded files, locally and safely.
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CSV Filter
Filter uploaded CSV rows by column value using contains, equals, or regex, with local browser processing.
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CSV Header Normalizer
Standardize CSV header rows to snake_case, kebab-case, camelCase, or Title Case before imports and scripts.
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CSV Sorter
Sort uploaded CSV rows by a selected column with numeric-aware ordering and local-only processing.
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CSV Stats Summary
Upload CSV and get a quick Markdown profile of filled, missing, unique, numeric, min, max, and average values.
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CSV ⇄ JSON Converter
Convert CSV to JSON or JSON to CSV — handles quoted commas, newlines in cells, custom delimiter — browser-only
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CSV to Markdown Table
Convert uploaded or pasted CSV into clean Markdown tables with quoted-cell support, locally in the browser.
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CSV to TSV Converter
Convert CSV files to tab-separated values while preserving quoted commas, quotes, and multiline cells locally.
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CSV Transposer
Flip CSV rows and columns from uploaded files or pasted data, with ragged-row handling and local output.
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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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Customer Lifetime Value Calculator
CLV / LTV for SaaS and e-commerce — simple and SaaS formulas, LTV:CAC health check, one-click copy — runs in your browser
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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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Domain Name Deduplicator
Find duplicates and keep one clean copy of domain names from pasted text or uploaded local files.
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Domain Name Extractor
Extract, dedupe, and export domain names from pasted text or uploaded local files.
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Domain Name List Converter
Convert domain names from pasted text or uploaded local files.
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Domain Name List Validator
Validate and explain issues in domain names from pasted text or uploaded local files.
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Domain Name Normalizer
Normalize, sort, and prepare domain names from pasted text or uploaded local files.
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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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Email Address Deduplicator
Find duplicates and keep one clean copy of email addresses from pasted text or uploaded local files.
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Email Address Extractor
Extract, dedupe, and export email addresses from pasted text or uploaded local files.
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Email Address List Converter
Convert email addresses from pasted text or uploaded local files.
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Email Address List Validator
Validate and explain issues in email addresses from pasted text or uploaded local files.
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Email Address Normalizer
Normalize, sort, and prepare email addresses from pasted text or uploaded local files.
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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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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
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Email Validator
Validate emails — RFC 5321 syntax + bulk paste + disposable detection + MX hint.
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Emoji Finder
Unicode 15.1 / 1500+ emojis with bilingual search — one-click copy, browser-only
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Emoji Kitchen
Emoji mashup — combine two emojis to make a new one (Unicode-only, no Google API, with 500+ pre-defined combos).
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Emoji Recommender
Emoji recommender — paste your headline or post, get matching emoji suggestions.
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Expense Tracker
Expense tracker — log spend, categorize, see monthly totals, all in your browser.
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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.
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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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Hashtag Deduplicator
Find duplicates and keep one clean copy of hashtags from pasted text or uploaded local files.
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Hashtag Extractor
Extract, dedupe, and export hashtags from pasted text or uploaded local files.
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Hashtag Generator
Hashtag generator — Instagram / TikTok / Twitter / Xiaohongshu / Weibo hashtags from your topic.
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Hashtag List Converter
Convert hashtags from pasted text or uploaded local files.
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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.
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Headline Analyzer
Headline analyzer — score your title's clickability, SEO length, emotional words, power words.
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Hreflang Tag Generator
Paste lang|url pairs, get hreflang link tags, HTTP Link header and sitemap XML with x-default and code validation, browser-only
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HTML Link Extractor
Upload HTML and extract anchors, images, scripts, stylesheets, canonicals, and meta URLs into CSV locally.
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HTML Minifier
Minify HTML — strip comments, whitespace, optional attributes, inline CSS/JS. 40-60% smaller.
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HTML to Markdown
HTML to Markdown — paste rich content, get clean .md with links, code, tables, lists preserved.
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Google Fonts CSS2 URL Builder
Parse, edit, and generate Google Fonts CSS2 links, HTML preconnect tags, @import CSS, variables, and Tailwind font stacks.
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ICS Event Generator
Fill a form, get a valid .ics calendar event with reminder and repeat rule, ready to import into Google, Apple or Outlook
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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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Image Host
Upload an image, get a permanent direct link plus ready-to-paste Markdown, HTML and BBCode.
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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 Target Size Compressor
Compress one image to a target KB size locally with quality search, automatic downscaling, preview, and download.
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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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Interview Questions Bank
Interview questions bank — 300+ real questions across behavioral / technical / case / culture, with strong answer frameworks.
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Invoice Generator
Free invoice generator — clean PDF in your browser, no signup, no watermark.
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JS Minifier
Minify JavaScript — strip comments, whitespace, optional name shortening. 40-70% smaller.
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JSON-LD Schema Generator
Build valid schema.org JSON-LD for Article, Product, FAQ, LocalBusiness, Event and more, copy the script tag, drop it in your head
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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
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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
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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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Lorem Ipsum Generator
Classic Lorem Ipsum filler text — paragraphs, sentences, or words — copy in one click, browser-only
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Lunar Calendar Converter (Chinese Nongli)
Gregorian ⇄ Chinese Lunar (Nongli) calendar — bi-directional, accurate 1900-2100.
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Mailto Link Generator
Build a mailto link with recipients, cc, bcc, subject and a multi-line body. Correct URL encoding, copy as plain URL or HTML anchor, all in your browser.
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Markdown Link Extractor
Upload Markdown and extract inline links, reference links, images, and bare URLs into a local CSV.
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Markdown Table Generator
Build Markdown tables visually — add/remove rows, column alignment, paste from Excel / CSV — browser-only
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Markdown to HTML
Convert Markdown to clean HTML — headings, lists, code, links, images, tables — instant live preview, browser-only
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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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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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Meta Description Brief Generator
Generate SEO meta description options from a page topic, keywords, and audience.
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Meta Tag Generator
Generate SEO meta tags — title, description, Open Graph, Twitter Card, Schema.org.
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Mock Data Generator
Generate realistic mock JSON / CSV / SQL data — names, emails, dates, addresses, nested objects.
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Mortgage Calculator
Mortgage calculator — monthly payment, total interest, amortization schedule, early payoff scenarios.
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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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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.
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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.
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Password Strength Checker
Check password strength — entropy, time-to-crack, breach pattern check (offline).
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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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PDF Merger
PDF merger — combine multiple PDFs into one, drag to reorder pages, 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 Splitter
PDF splitter — extract pages or split by range, every page becomes a PDF, 100% client-side with pdf-lib.
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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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Percentage Change Calculator
Growth rate, drop, percentage-point gap, and reverse-solve the new value — signed, color-coded, browser-only
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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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Placeholder Image Generator
Generate placeholder images instantly — size, color, text, PNG/JPG/WebP.
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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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Pregnancy Due Date Calculator
Pregnancy due date calculator — track weeks, trimester, baby development by week.
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Prompt Template Library
200+ prompt templates for ChatGPT, Claude, Gemini — copy-paste, browse by use case.
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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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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.
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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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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
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Random Number Generator
Generate cryptographically-secure random integers — single or batch, with/without duplicates — browser-only
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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
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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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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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Robots.txt Auditor
Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.
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robots.txt Generator
Generate robots.txt with templates for common crawlers (Google, Bing, AI scrapers).
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ROI Calculator
ROI %, net gain, annualized ROI (CAGR) and payback period — one screen, share a link — 100% in your browser
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Salary to Hourly Converter
Hourly ⇄ daily ⇄ weekly ⇄ monthly ⇄ annual pay — set your hours/week and weeks/year, see all five at once — browser-only
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Sample Size Calculator
How many people to survey for a given confidence and margin of error — finite-population correction, reverse mode, one-click copy, browser-only
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Shoe Size Converter
US ⇄ UK ⇄ EU ⇄ CN ⇄ JP + foot length (cm/in) — men, women, kids — browser-only
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Sitemap URL Auditor
Paste sitemap XML and audit URL count, HTTP links, duplicates, trailing-slash conflicts, query parameters, lastmod freshness, and extensions.
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Slogan Generator
Slogan generator — 30+ proven copywriting formulas, generate brand slogans in seconds, bilingual.
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URL Slug Generator
Turn any title into a clean URL slug — lowercase, dashes, ASCII-safe transliteration, multiline batch — browser-only
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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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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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Social Media Character Counter
Count characters against real X, Instagram, Weibo, LinkedIn, TikTok and SMS limits as you type, all in your browser
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Startup Name Generator
Suffix, blend, vowel-drop, prefix and Latin-root naming in one click — seed it with your industry, batch up to 30, copy any one
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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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System Prompt Builder
Turn role, task, constraints, and output rules into a structured system prompt you can copy.
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TDEE Calculator
TDEE calculator — BMR × activity factor, with cut/bulk calorie targets and projected weekly weight change.
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Text Deduplicator
Remove duplicate lines from any list — case-sensitive optional, whitespace-trim optional, count duplicates — browser-only
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Text Sorter
Sort lines alphabetically, numerically, by length, or reverse — case-sensitive optional — browser-only
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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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Title Case Converter
Capitalize an English title the way editors do, AP / Chicago / APA / MLA, small words stay down, acronyms kept, runs in your browser
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Traditional ⇄ Simplified Chinese Converter
Traditional ⇄ Simplified Chinese — fast, character-level, no API.
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TSV to CSV Converter
Turn tab-separated files into standards-friendly CSV with proper quoting, download, and local processing.
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Twitter Card Generator
Build twitter:card meta tags for X with a live card preview, Open Graph fallback and one-click copy, 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 Encoder Decoder with Query Parameter Table
Encode, decode, inspect query parameters, process bulk URL lists, and copy clean outputs entirely in your browser.
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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 Query Params Extractor
Extract, deduplicate, inspect, copy, and export query parameters from one URL or many URLs locally.
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Username Generator
Random usernames in five styles, four case formats, optional numbers, batch up to 50, all in your browser
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UTM Link Builder
UTM link builder — track campaign source, medium, name. GA4/Google Analytics compatible.
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VAT / Sales Tax Calculator
Add tax, remove tax, or find the rate — net ⇄ gross at any VAT / GST / sales-tax rate — instant, browser-only
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vCard Generator
Fill in a contact, get a standard vCard 3.0 (.vcf) file, download or copy, runs only in your browser
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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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Wedding Budget Planner
Wedding budget planner — itemized cost calculator with regional benchmarks for venue, photography, catering, etc.
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Weekly Report Generator
Weekly report generator — fill blanks, get clean markdown, no AI hallucination.
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Word Counter
Count words, characters, sentences, paragraphs and reading time in any text — instant, browser-only
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Word Frequency Counter
Rank every word + phrase by frequency, with keyword density, stop-word filtering, and n-gram analysis — browser-only
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Work Anniversary Calculator
Work tenure calculator — service years, annual leave entitlement (China), retirement countdown.
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YouTube Title Analyzer
Score a YouTube title for clarity, specificity, length, and keyword position.