Free Online Developer Tools
Format, validate, encode, and test code snippets.
JSON Formatter
Format, validate, and minify JSON.
Base64 Encode/Decode
Encode and decode Base64 strings.
URL Encode/Decode
Percent-encode or decode URL strings.
JWT Decoder
Decode JSON Web Tokens locally.
Regex Tester
Test regular expressions with live matches.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
UUID Generator
Generate v4 UUIDs on demand.
Timestamp Converter
Convert Unix timestamps to dates and back.
Cron Expression Reader
Explain cron expressions in plain English.
HTML Beautifier
Format HTML with proper indentation.
CSS Beautifier
Format CSS with consistent indentation.
JavaScript Beautifier
Format JavaScript source code.
CSS Minifier
Shrink CSS for production.
JavaScript Minifier
Shrink JS for production.
HTML Minifier
Compress HTML for faster loads.
SQL Formatter
Pretty-print SQL queries.
XML Formatter
Format and validate XML.
About developer tools
A fast, searchable collection of developer utilities used daily by engineers — formatters, validators, encoders, and generators. Everything is keyboard-friendly, copy-ready, and private.