Text for Developer

186 text tools hand-picked for Developer.

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
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).
Apache Cheatsheet

Apache HTTP Server cheatsheet for httpd.conf, VirtualHost, .htaccess, mod_rewrite, SSL, proxying, auth, headers, and logs.
ASCII Art Generator

Generate ASCII art from text — figlet-style banners, multiple fonts.
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.
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.
AWS S3 Cheatsheet

AWS S3 cheat sheet — 58+ commands covering buckets, sync, presign, versioning, lifecycle, encryption, CORS, and multipart.
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.
Bash Cheatsheet

Bash cheat sheet — 100+ commands & idioms for variables, conditionals, loops, functions, pipes, traps, with real one-liners.
Case Converter

Convert text between camelCase, snake_case, kebab-case, PascalCase, Title Case, UPPER, lower — instant, browser-only
Character Frequency Counter

Count how often every character appears, ranked by frequency, with case, space and punctuation toggles, browser-only
Chinese Pinyin Converter

Chinese characters to pinyin — with tone marks or numbers, supports simplified and traditional.
Column Align

Pad delimited rows into an even monospace grid, like column -t, with correct CJK width — browser-only
Cover Letter Generator

Cover letter generator — fill 6 fields, pick a tone, get a tailored cover letter in 4 templates, bilingual.
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.
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.
curl Cheatsheet

curl cheat sheet — 80+ curl commands for GET/POST/auth/upload/download/SSL/proxy, with real examples and pitfalls.
Directory Tree Generator

Turn an indented file list into a clean ASCII folder tree with box-drawing guides, choose Unicode or ASCII, then copy it into any README, browser-only
DNA to RNA Converter

Transcribe DNA to mRNA, build the reverse complement, translate codons to protein — standard genetic code, browser-only
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.
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.
.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.
Elasticsearch Cheatsheet

Elasticsearch cheat sheet — 80+ Query DSL, mapping, analyzer, aggregation, replication, with real examples.
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 Validator

Validate emails — RFC 5321 syntax + bulk paste + disposable detection + MX hint.
Emoji Remover

Strip every emoji from text, family and skin-tone combos removed whole, your words and punctuation left untouched, browser-only
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
ENV Secret Scanner

Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.
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.
Figlet ASCII Banner Generator

Turn a short word into a big ASCII letter banner with three built-in fonts, all in your browser
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
GC Content Calculator

Paste a DNA or RNA sequence and get GC%, AT%, per-base counts, length and a melting-temperature estimate. FASTA headers and spaces are ignored, invalid bases flagged, all in your browser.
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.
GraphQL Formatter & Minifier

GraphQL formatter + minifier — beautify query/mutation/subscription/schema, validate syntax, copy minified single-line for HTTP body.
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 Entities Encoder

Encode/decode HTML entities — & < > " ' and all numeric refs — browser-only
HTML Entity Encoder / Decoder

Encode & decode all HTML5 entities — named, decimal, hex — XSS prevention and safe markup, 100% client-side
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.
HTTP Status Code Explorer

HTTP status code explorer — all 70+ codes with meaning, common causes, real examples, and what to check.
Image to ASCII Art

Image to ASCII art — convert any image to text-based art with adjustable density and character set.
Interview Questions Bank

Interview questions bank — 300+ real questions across behavioral / technical / case / culture, with strong answer frameworks.
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.
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.
kubectl Cheatsheet

kubectl cheat sheet — 100+ Kubernetes commands with real examples, common pitfalls, and YAML snippets.
List Comparison

Compare two lists line by line: only in A, only in B, in both, and merged — all in your browser
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
Log Error Analyzer

Paste logs and group repeated errors, warnings, stack traces, HTTP statuses, endpoint patterns, and time ranges into a local incident report.
Log Line Cleaner

Clean noisy logs by removing timestamps, ANSI colors, blank lines, long lines, or non-error entries in your browser.
Lorem Ipsum Generator

Classic Lorem Ipsum filler text — paragraphs, sentences, or words — copy in one click, browser-only
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 Cheat Sheet

Markdown syntax cheat sheet — every rule with live preview side by side, GFM + flavors.
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
Markdown to HTML

Convert Markdown to clean HTML — headings, lists, code, links, images, tables — instant live preview, browser-only
Markdown to Plain Text

Strip Markdown to clean plain text — headings, bold, links, code, lists, tables, HTML all flattened — browser-only
MIDI Note Number Converter

MIDI number ⇄ note name ⇄ frequency — note 60 is middle C, A4 = 440 Hz, cents off, C3/C4 toggle — browser-only
MongoDB Cheatsheet

MongoDB cheat sheet — 80+ shell commands & query operators for CRUD, aggregation, indexing, replication.
Morse Code Translator

Text to Morse code and back — encode, decode, audio playback, ITU standard.
Multicultural Name Generator

Random names from 11 cultures — Chinese, English, Japanese, Korean, Arabic, Russian + 5 European.
Netlify Redirects Cheatsheet

Netlify _redirects and netlify.toml cheatsheet for rewrites, proxies, SPA fallbacks, splats, status codes, and country/language rules.
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.
Number Extractor

Pull every number out of any text: integers, decimals, negatives, 1,234 commas, percents and 6.02e23, with instant sum and average
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.
Palindrome Checker

Tells you if text reads the same backwards, finds the longest palindrome inside, handles Chinese and emoji, runs in your browser
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.
Pluralizer

Turn singular English nouns into plurals and back, with irregulars, -ies, -ves and uncountables handled, all in your browser
PostgreSQL Cheatsheet

PostgreSQL cheat sheet — 80+ commands & functions for psql, JSONB, CTEs, window functions, indexing, partitioning, advanced extensions.
Prompt Template Library

200+ prompt templates for ChatGPT, Claude, Gemini — copy-paste, browse by use case.
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).
Regex Tester

Test JavaScript regex live — match highlighting, group capture, replace preview, flag toggles — browser-only
Remove Accents

Strip diacritics from Latin text, café to cafe, ñ to n, ß to ss, runs entirely 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
Resume Template Builder

Resume template builder — fill a form, get a clean PDF resume in 3 templates (modern / classic / minimal), bilingual.
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.
ROT13 Encoder & Decoder

ROT13 / ROT47 / Caesar cipher — encode and decode in your browser, instant.
Rust Cheatsheet

Rust cheat sheet — 100+ snippets covering ownership, borrowing, lifetimes, traits, async, error handling.
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.
URL Slug Generator

Turn any title into a clean URL slug — lowercase, dashes, ASCII-safe transliteration, multiline batch — browser-only
SQL Cheatsheet

SQL cheat sheet — 100+ statements covering SELECT, JOIN, window functions, indexing, MySQL/PostgreSQL/SQLite differences.
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.
Svelte Cheatsheet

Svelte 5 cheat sheet — runes ($state, $derived, $effect), snippets, props, stores, with Svelte 4 comparison.
System Prompt Builder

Turn role, task, constraints, and output rules into a structured system prompt you can copy.
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
Tailwind CSS Cheatsheet

Tailwind CSS cheat sheet — 100+ utility classes (spacing, color, flex, grid, typography, responsive) with live preview.
Text Box Drawing Generator

Wrap text in single, double, rounded, bold, ascii or stars boxes with CJK-aware alignment, padding and a title row, all in your browser
Text Deduplicator

Remove duplicate lines from any list — case-sensitive optional, whitespace-trim optional, count duplicates — browser-only
Text Diff

Compare two blocks of text — line-by-line additions, deletions, equal — colour highlighted, browser-only
Text Repeater

Repeat any text N times with newline, space, comma or custom separators, optional numbering and a wrap, browser-only
Text Sorter

Sort lines alphabetically, naturally (file2 < file10), numerically, by length — locale-aware — browser-only
Text to Binary Converter

Text to binary (and back) — UTF-8 aware, 8/16/32 bit grouping, emoji safe.
Text Wrap

Hard-wrap text at any column width, by word or by character, with optional line prefix, all in your browser
Traditional ⇄ Simplified Chinese Converter

Traditional ⇄ Simplified Chinese — fast, character-level, no API.
TypeScript Cheatsheet

TypeScript cheat sheet — 100+ snippets for types, generics, utility types, narrowing, async patterns.
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 Code Point Inspector

Paste text → get a per-code-point table: U+XXXX, UTF-8 bytes, UTF-16, HTML entity, JS escape, character name.
Unicode Inspector and Normalizer

Inspect code points, names, categories, UTF-8 bytes and normalize text to NFC, NFD, NFKC or NFKD entirely in your browser.
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
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.
URL List Converter

Convert 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.
UTF-8 Byte Counter

Count UTF-8 bytes, UTF-16 code units, Unicode code points and characters in any string, right in your browser
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.
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.
Whitespace Visualizer

See every space, tab, newline and hidden character — middle-dot spaces, arrow tabs, pilcrow line breaks, trailing-space highlight, 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

Add Line Numbers

AI Eval Planner

AI Model Comparison

AI Token Counter

Apache Cheatsheet

ASCII Art Generator

ASCII Table Generator

ASCII Table Reference

awk + sed Cheatsheet

AWS CLI Cheatsheet

AWS S3 Cheatsheet

Base64 Block Deduplicator

Base64 Block Extractor

Base64 Block List Converter

Base64 Block List Validator

Base64 Block Normalizer

Bash Cheatsheet

Case Converter

Character Frequency Counter

Chinese Pinyin Converter

Column Align

Cover Letter Generator

Credit Card Number Deduplicator

Credit Card Number Extractor

Credit Card Number List Converter

Credit Card Number List Validator

Credit Card Number Normalizer

CSS Variable Deduplicator

CSS Variable Extractor

CSS Variable List Converter

CSS Variable List Validator

CSS Variable Normalizer

curl Cheatsheet

Directory Tree Generator

DNA to RNA Converter

DNS Record Explainer

Docker Cheatsheet

Domain Name Deduplicator

Domain Name Extractor

Domain Name List Converter

Domain Name List Validator

Domain Name Normalizer

.env File Validator

Elasticsearch Cheatsheet

Email Address Deduplicator

Email Address Extractor

Email Address List Converter

Email Address List Validator

Email Address Normalizer

Email Validator

Emoji Remover

Emoji to Unicode Converter

ENV Secret Scanner

Environment Variable Deduplicator

Environment Variable Extractor

Environment Variable List Converter

Environment Variable List Validator

Environment Variable Normalizer

Figlet ASCII Banner Generator

Filename Sanitizer

Find and Replace Text

GC Content Calculator

Git Cheatsheet

Go (Golang) Cheatsheet

GraphQL Formatter & Minifier

Hex Color Deduplicator

Hex Color Extractor

Hex Color List Converter

Hex Color List Validator

Hex Color Normalizer

HTML Entities Encoder

HTML Entity Encoder / Decoder

HTTP Header Deduplicator

HTTP Header Extractor

HTTP Header List Converter

HTTP Header List Validator

HTTP Header Normalizer

HTTP Status Code Explorer

Image to ASCII Art

Interview Questions Bank