Text for Developer
171 text tools hand-picked for Developer.
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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
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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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AI Model Comparison
AI model comparison — 20+ models (GPT / Claude / Gemini / Llama / Qwen) across price, context, speed, capabilities (2026).
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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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ASCII Art Generator
Generate ASCII art from text — figlet-style banners, multiple fonts.
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ASCII Table Generator
Paste CSV or TSV, get a monospace table that lines up: +--+ ASCII, Unicode box, Markdown, with real CJK width
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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.
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awk + sed Cheatsheet
awk + sed cheat sheet — 80+ one-liners for text processing, with real examples and common pitfalls.
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AWS CLI Cheatsheet
AWS CLI cheat sheet — 80+ commands for EC2 / S3 / IAM / Lambda / RDS / EKS / CloudFormation with real examples.
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Base64 Block Deduplicator
Find duplicates and keep one clean copy of base64 blocks from pasted text or uploaded local files.
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Base64 Block Extractor
Extract, dedupe, and export base64 blocks from pasted text or uploaded local files.
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Base64 Block List Converter
Convert base64 blocks from pasted text or uploaded local files.
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Base64 Block List Validator
Validate and explain issues in base64 blocks from pasted text or uploaded local files.
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Base64 Block Normalizer
Normalize, sort, and prepare base64 blocks from pasted text or uploaded local files.
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Bash Cheatsheet
Bash cheat sheet — 100+ commands & idioms for variables, conditionals, loops, functions, pipes, traps, with real one-liners.
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Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, Title Case, UPPER, lower — instant, browser-only
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Character Frequency Counter
Count how often every character appears, ranked by frequency, with case, space and punctuation toggles, browser-only
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Chinese Pinyin Converter
Chinese characters to pinyin — with tone marks or numbers, supports simplified and traditional.
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Column Align
Pad delimited rows into an even monospace grid, like column -t, with correct CJK width — browser-only
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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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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.
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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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CSS Variable Deduplicator
Find duplicates and keep one clean copy of css variables from pasted text or uploaded local files.
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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.
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CSS Variable List Validator
Validate and explain issues in css variables from pasted text or uploaded local files.
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CSS Variable Normalizer
Normalize, sort, and prepare css variables from pasted text or uploaded local files.
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curl Cheatsheet
curl cheat sheet — 80+ curl commands for GET/POST/auth/upload/download/SSL/proxy, with real examples and pitfalls.
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DNS Record Explainer
DNS record explainer — all 18 common record types (A, AAAA, CNAME, MX, TXT, SRV, etc.) with syntax, examples, and gotchas.
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Docker Cheatsheet
Docker command cheat sheet — 80+ commands with real examples, common mistakes, and Compose section.
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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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.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.
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Elasticsearch Cheatsheet
Elasticsearch cheat sheet — 80+ Query DSL, mapping, analyzer, aggregation, replication, with real examples.
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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 Validator
Validate emails — RFC 5321 syntax + bulk paste + disposable detection + MX hint.
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Emoji Remover
Strip every emoji from text, family and skin-tone combos removed whole, your words and punctuation left untouched, browser-only
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Emoji to Unicode Converter
Emoji ⇄ Unicode code points, both ways. U+XXXX, decimal, HTML entity, JS and CSS escapes, every code point of a ZWJ family, skin tone or flag, plus one-click restore, all in your browser
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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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Environment Variable Deduplicator
Find duplicates and keep one clean copy of environment variables from pasted text or uploaded local files.
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Environment Variable Extractor
Extract, dedupe, and export environment variables from pasted text or uploaded local files.
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Environment Variable List Converter
Convert environment variables from pasted text or uploaded local files.
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Environment Variable List Validator
Validate and explain issues in environment variables from pasted text or uploaded local files.
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Environment Variable Normalizer
Normalize, sort, and prepare environment variables from pasted text or uploaded local files.
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Filename Sanitizer
Strip illegal characters and make any string a safe cross-platform filename, in your browser
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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
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Git Cheatsheet
Git command cheat sheet — searchable, with explanations, common mistakes, and real examples.
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Go (Golang) Cheatsheet
Go (Golang) cheat sheet — 100+ idiomatic snippets covering syntax, goroutines, channels, generics, errors, stdlib.
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GraphQL Formatter & Minifier
GraphQL formatter + minifier — beautify query/mutation/subscription/schema, validate syntax, copy minified single-line for HTTP body.
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Hex Color Deduplicator
Find duplicates and keep one clean copy of hex colors from pasted text or uploaded local files.
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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.
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Hex Color List Validator
Validate and explain issues in hex colors from pasted text or uploaded local files.
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Hex Color Normalizer
Normalize, sort, and prepare hex colors from pasted text or uploaded local files.
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HTML Entities Encoder
Encode/decode HTML entities — & < > " ' and all numeric refs — browser-only
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HTTP Header Deduplicator
Find duplicates and keep one clean copy of http headers from pasted text or uploaded local files.
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HTTP Header Extractor
Extract, dedupe, and export http headers from pasted text or uploaded local files.
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HTTP Header List Converter
Convert http headers from pasted text or uploaded local files.
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HTTP Header List Validator
Validate and explain issues in http headers from pasted text or uploaded local files.
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HTTP Header Normalizer
Normalize, sort, and prepare http headers from pasted text or uploaded local files.
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HTTP Status Code Explorer
HTTP status code explorer — all 70+ codes with meaning, common causes, real examples, and what to check.
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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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Interview Questions Bank
Interview questions bank — 300+ real questions across behavioral / technical / case / culture, with strong answer frameworks.
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IPv4 Address Deduplicator
Find duplicates and keep one clean copy of ipv4 addresses from pasted text or uploaded local files.
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IPv4 Address Extractor
Extract, dedupe, and export ipv4 addresses from pasted text or uploaded local files.
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IPv4 Address List Converter
Convert ipv4 addresses from pasted text or uploaded local files.
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IPv4 Address List Validator
Validate and explain issues in ipv4 addresses from pasted text or uploaded local files.
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IPv4 Address Normalizer
Normalize, sort, and prepare ipv4 addresses from pasted text or uploaded local files.
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IPv6 Address Deduplicator
Find duplicates and keep one clean copy of ipv6 addresses from pasted text or uploaded local files.
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IPv6 Address Extractor
Extract, dedupe, and export ipv6 addresses from pasted text or uploaded local files.
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IPv6 Address List Converter
Convert ipv6 addresses from pasted text or uploaded local files.
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IPv6 Address List Validator
Validate and explain issues in ipv6 addresses from pasted text or uploaded local files.
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IPv6 Address Normalizer
Normalize, sort, and prepare ipv6 addresses from pasted text or uploaded local files.
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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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JSONPath / JMESPath Query Tester
JSONPath / JMESPath query tester — paste JSON, write a path, see matched values + matched paths highlighted live.
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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.
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JWT Token List Validator
Validate and explain issues in jwt tokens from pasted text or uploaded local files.
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JWT Token Normalizer
Normalize, sort, and prepare jwt tokens from pasted text or uploaded local files.
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kubectl Cheatsheet
kubectl cheat sheet — 100+ Kubernetes commands with real examples, common pitfalls, and YAML snippets.
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List Comparison
Compare two lists line by line: only in A, only in B, in both, and merged — all in your browser
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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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Log Error Analyzer
Paste logs and group repeated errors, warnings, stack traces, HTTP statuses, endpoint patterns, and time ranges into a local incident report.
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Log Line Cleaner
Clean noisy logs by removing timestamps, ANSI colors, blank lines, long lines, or non-error entries in your browser.
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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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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.
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MAC Address List Converter
Convert mac addresses from pasted text or uploaded local files.
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MAC Address List Validator
Validate and explain issues in mac addresses from pasted text or uploaded local files.
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MAC Address Normalizer
Normalize, sort, and prepare mac addresses from pasted text or uploaded local files.
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Markdown Cheat Sheet
Markdown syntax cheat sheet — every rule with live preview side by side, GFM + flavors.
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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.
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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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Markdown to Plain Text
Strip Markdown to clean plain text — headings, bold, links, code, lists, tables, HTML all flattened — browser-only
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MongoDB Cheatsheet
MongoDB cheat sheet — 80+ shell commands & query operators for CRUD, aggregation, indexing, replication.
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Morse Code Translator
Text to Morse code and back — encode, decode, audio playback, ITU standard.
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Multicultural Name Generator
Random names from 11 cultures — Chinese, English, Japanese, Korean, Arabic, Russian + 5 European.
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Next.js Cheatsheet
Next.js 15 cheat sheet — App Router, Server Components, Server Actions, dynamic routes, with examples and pitfalls.
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Nginx Cheatsheet
Nginx cheat sheet — common configs, location/server blocks, SSL, reverse proxy, gzip, real examples & gotchas.
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npm / yarn / pnpm Cheatsheet
npm / yarn / pnpm cheat sheet — 80+ commands across init, install, scripts, publish, with cross-tool comparison.
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Number Extractor
Pull every number out of any text: integers, decimals, negatives, 1,234 commas, percents and 6.02e23, with instant sum and average
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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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Palindrome Checker
Tells you if text reads the same backwards, finds the longest palindrome inside, handles Chinese and emoji, runs 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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PostgreSQL Cheatsheet
PostgreSQL cheat sheet — 80+ commands & functions for psql, JSONB, CTEs, window functions, indexing, partitioning, advanced extensions.
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Prompt Template Library
200+ prompt templates for ChatGPT, Claude, Gemini — copy-paste, browse by use case.
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Python Cheatsheet
Python cheat sheet — 100+ idiomatic Python snippets for string, list, dict, file, async, with real examples.
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React Hooks Cheatsheet
React hooks cheat sheet — all 17 built-in hooks (useState / useEffect / useMemo / useTransition / useFormStatus...) with real examples and pitfalls.
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Redis Cheatsheet
Redis cheat sheet — 80+ commands across strings, hashes, lists, sets, sorted sets, pub/sub, streams, scripts, with examples and pitfalls.
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Regex Cheatsheet
Interactive regex cheat sheet — quick reference for every flavor (JS, Python, PCRE).
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Regex Tester
Test JavaScript regex live — match highlighting, group capture, replace preview, flag toggles — browser-only
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Remove Accents
Strip diacritics from Latin text, café to cafe, ñ to n, ß to ss, runs entirely in your browser
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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
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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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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
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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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ROT13 Encoder & Decoder
ROT13 / ROT47 / Caesar cipher — encode and decode in your browser, instant.
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Rust Cheatsheet
Rust cheat sheet — 100+ snippets covering ownership, borrowing, lifetimes, traits, async, error handling.
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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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URL Slug Generator
Turn any title into a clean URL slug — lowercase, dashes, ASCII-safe transliteration, multiline batch — browser-only
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SQL Cheatsheet
SQL cheat sheet — 100+ statements covering SELECT, JOIN, window functions, indexing, MySQL/PostgreSQL/SQLite differences.
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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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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.
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Svelte Cheatsheet
Svelte 5 cheat sheet — runes ($state, $derived, $effect), snippets, props, stores, with Svelte 4 comparison.
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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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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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Tailwind CSS Cheatsheet
Tailwind CSS cheat sheet — 100+ utility classes (spacing, color, flex, grid, typography, responsive) with live preview.
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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 Diff
Compare two blocks of text — line-by-line additions, deletions, equal — colour highlighted, 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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Text to Binary Converter
Text to binary (and back) — UTF-8 aware, 8/16/32 bit grouping, emoji safe.
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Text Wrap
Hard-wrap text at any column width, by word or by character, with optional line prefix, all in your browser
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Traditional ⇄ Simplified Chinese Converter
Traditional ⇄ Simplified Chinese — fast, character-level, no API.
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TypeScript Cheatsheet
TypeScript cheat sheet — 100+ snippets for types, generics, utility types, narrowing, async patterns.
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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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Unslugify
Turn my-blog-post, user_first_name and parseHTMLContent back into readable text, browser-only
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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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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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Vim Cheatsheet
Vim cheat sheet — 100+ commands covering modes, motions, edits, search, registers, splits, with mnemonics.
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Vue 3 Cheatsheet
Vue 3 cheat sheet — Composition API, reactivity, components, directives, Pinia, with side-by-side Options API comparison.
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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