Dev tools
JSON, regex, base64, hashes
Variotools developer tools cover the daily needs of anyone who writes code: JSON formatter and validator, JSON↔CSV converters, JWT decoder, regex tester with live matches, UUID generator (v1, v4, v7), hash generator (MD5, SHA-1, SHA-256, SHA-512), Base64 and URL encoder/decoder, HTML escape, CSS/JS minifier, number base converters (binary, hex, octal, decimal), ASCII table, RGB↔HEX converter, Unix timestamp converter, cron expression builder and a diff checker to compare texts side by side. All run 100% in your browser — your code, tokens and data never leave your computer. Ideal for web, mobile, backend and DevOps developers as well as programming students. No intrusive ads, no signup, no aggressive tracking. Every tool is built to be fast: paste, process, copy. Keyboard shortcuts on most of them, dark mode supported, and available in English, Portuguese and Spanish.
Tools in Dev tools
ASCII Table
Complete ASCII reference table (0-127)
Base64 Encode / Decode
Two-way encoding and decoding
Binary and Hex Translator
Turn text into binary or hexadecimal, and back again
Color Picker
Visual + HEX, RGB, HSL, oklch
Cron Expression Builder
Build cron expressions with presets and natural-language description
CSS Minifier
Reduce CSS size by removing whitespace and comments
Diff Checker
Compare two texts and see differences by char, word or line
Hash Generator
MD5, SHA-1, SHA-256, SHA-512
HTML Escape / Unescape
Encode and decode HTML entities
JS Minifier
Minify JavaScript with Terser — mangling, dead code and comment removal
JSON and CSV Converter
Convert JSON to CSV and CSV to JSON, both ways
JSON Formatter
Format, validate and minify JSON online
JWT Decoder
Decode JWT token header and payload
Markdown Preview
Markdown editor with live preview and XSS sanitization
Number Base Converter
Convert between binary, octal, decimal and hexadecimal
Regex Builder
Build regular expressions from blocks, no syntax to memorize
Regex Tester
Test regular expressions with flags and live match highlighting
Timestamp Converter
Convert between Unix timestamp and human-readable date
URL Encode / Decode
Percent-encode strings
UUID Generator
v1, v4 or v7 with bulk export