Developer Tools
That Just Work
A collection of 101 fast, free, and privacy-first developer tools. Format JSON, compare diffs, generate tokens, convert colors, decode JWTs, and more — all running entirely in your browser.
Lightning Fast
All tools run client-side with zero network latency. Instant results every time.
Privacy First
Your data never leaves your browser. No tracking, no analytics, no cookies.
Developer Focused
101 tools built by developers, for developers. Clean UI, copy buttons, and clear error messages.
Newly Added
All 101 Tools
View all →Data (15)
JSON Formatter / Validator
Format, beautify, and validate JSON data
DataYAML to JSON Converter
Convert YAML to JSON format
DataJSON to CSV Converter
Convert JSON arrays to CSV format
DataCSV to JSON Converter
Convert CSV data to JSON format
DataJSON Minify
Minify JSON by removing whitespace
DataJSON Diff Checker
Compare two JSON objects side by side
DataJSON to YAML Converter
Convert JSON to YAML format
DataXML Formatter / Validator
Format and beautify XML documents
DataJSON Path Evaluator
Query JSON data with JSONPath expressions
DataJSON to TypeScript
Generate TypeScript interfaces from JSON
DataJSON to Go Struct
Generate Go structs from JSON
DataJSON Schema Validator
Validate JSON against a schema
DataTOML to JSON Converter
Convert between TOML and JSON
DataCSV Viewer
View CSV data as a table
DataJSON to XML Converter
Convert JSON to XML format
DataEncoding (11)
Base64 Encode / Decode
Encode and decode Base64 strings
EncodingURL Encode / Decode
Encode and decode URL strings
EncodingHTML Encode / Decode
Encode and decode HTML entities
EncodingUnicode Escape / Unescape
Escape and unescape Unicode sequences
EncodingHex Encode / Decode
Encode and decode hexadecimal strings
EncodingROT13 Encoder / Decoder
ROT13 letter rotation cipher
EncodingPunycode Converter
Convert between IDN and Punycode
EncodingMorse Code Translator
Translate between text and Morse code
EncodingAscii85 / Base85 Encoder
Encode and decode Ascii85 / Base85
EncodingString Escape / Unescape
Escape strings for different languages
EncodingBase64 ↔ Image Converter
Convert between Base64 and images
EncodingText (17)
Regex Tester
Test and debug regular expressions in real-time
TextMarkdown Preview
Live Markdown editor with real-time preview
TextSlug Generator
Convert text to URL-friendly slugs
TextText Diff Checker
Compare two texts and highlight differences
TextRemove Duplicate Lines
Remove duplicate lines from text
TextSort Lines
Sort text lines in various orders
TextWord Counter
Count words, characters, and reading time
TextCharacter Counter
Count characters, bytes, and Unicode points
TextText Case Converter
Convert text between different cases
TextFind & Replace
Find and replace text with regex support
TextText to Binary
Convert between text and binary
TextLine Number Adder
Add line numbers to text
TextText Reverser
Reverse text by characters, words, or lines
TextWhitespace Cleaner
Clean up whitespace in text
TextHTML to Markdown Converter
Convert HTML to Markdown
TextMarkdown to HTML Converter
Convert Markdown to HTML
TextNATO Phonetic Alphabet
Convert text to NATO phonetic alphabet
TextSecurity (11)
Password Generator
Generate strong, secure passwords
SecurityJWT Decoder
Decode and inspect JSON Web Tokens
SecurityHash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
SecurityJWT Encoder
Create and sign JWTs for testing
SecurityHMAC Generator
Generate HMAC signatures with a secret key
SecurityRSA Key Pair Generator
Generate RSA key pairs in PEM format
SecurityBcrypt Hash Generator
Generate and verify bcrypt hashes
SecurityAES Encrypt / Decrypt
AES-256 encryption and decryption
SecurityCSP Header Generator
Generate CSP headers visually
SecurityPassword Strength Checker
Analyze password strength
SecuritySSH Key Generator
Generate SSH key pairs
SecurityGenerator (13)
UUID Generator
Generate random UUID v4 identifiers
GeneratorRandom String Generator
Generate random strings and tokens
GeneratorLorem Ipsum Generator
Generate placeholder text for designs
GeneratorQR Code Generator / Decoder
Generate and decode QR codes
GeneratorTOTP / 2FA Generator
Generate TOTP 2FA codes
GeneratorFavicon Generator
Generate favicons from text or emoji
GeneratorNanoID Generator
Generate NanoID unique identifiers
GeneratorMock Data Generator
Generate realistic fake data
Generator.gitignore Generator
Generate .gitignore from templates
GeneratorMeta Tag Generator
Generate SEO and social meta tags
GeneratorLicense Generator
Generate open source licenses
GeneratorChmod Calculator
Calculate Unix file permissions
GeneratorCUID2 Generator
Generate CUID2 sortable IDs
GeneratorCode (15)
HTML Formatter
Format and beautify HTML code
CodeSQL Formatter
Format and beautify SQL queries
CodeCSS Formatter
Format and beautify CSS code
CodeColor Converter
Convert colors between HEX, RGB, HSL formats
CodeJavaScript Formatter
Format and beautify JavaScript code
CodeSVG Preview & Optimizer
Preview and optimize SVG code
CodeCSS Unit Converter
Convert between CSS units
CodeCSS Gradient Generator
Create CSS gradients visually
CodeBox Shadow Generator
Create CSS box-shadow visually
CodeRegex Quick Reference
Regex syntax cheatsheet
CodeJSON to CSS Variables
Convert JSON to CSS custom properties
CodeTypeScript Type Helper
TypeScript utility type reference
CodeYAML Formatter
Format and validate YAML
CodeCode to Image
Create code snippet screenshots
CodeTailwind ↔ CSS Converter
Convert Tailwind classes to CSS
CodeDate & Time (8)
Timestamp Converter
Convert Unix timestamps to dates and vice versa
Date & TimeCron Expression Parser
Parse and generate cron expressions
Date & TimeTime Zone Converter
Convert times across global time zones
Date & TimeDate Difference Calculator
Calculate date differences
Date & TimeISO 8601 Date Formatter
Format dates in multiple standards
Date & TimeDuration Calculator
Add and subtract time durations
Date & TimeCalendar / Week Number
Calendar with ISO week numbers
Date & TimeAge Calculator
Calculate exact age from birthdate
Date & Time