Free Online Developer Tools
12 essential developer tools that run 100% in your browser. Format JSON, test regex, encode Base64, generate UUIDs, decode JWTs, and more — all free, fast, and private.
Developer Tools
JSON Formatter
Format, validate, and beautify JSON with tree view and syntax highlighting.
Regex Tester
Test regex patterns with real-time match highlighting and pattern library.
Base64 Encode/Decode
Encode and decode Base64 strings and files with drag & drop support.
URL Encode/Decode
Encode, decode, and parse URLs with component breakdown.
HTML Formatter
Beautify and minify HTML code with proper indentation.
CSS Generator
Generate gradients, box shadows, and flexbox layouts visually.
JS Minifier
Minify JavaScript code and see size reduction percentage.
SQL Formatter
Format SQL queries with dialect support and keyword capitalization.
Cron Generator
Build cron expressions visually with human-readable descriptions.
JWT Decoder
Decode JWT tokens and inspect header, payload, and expiration.
UUID Generator
Generate UUID v4 with bulk generation and format options.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text or files.
Developer Guides & References
How to Format JSON
Complete guide to JSON formatting, validation, and common errors.
Read more →Regex Cheat Sheet
Comprehensive regex reference with examples for common patterns.
Read more →Base64 Encoding Explained
What is Base64, how it works, and when to use it.
Read more →Cron Expression Guide
Complete guide to cron syntax with examples for common schedules.
Read more →JWT Tokens Explained
Understanding JWT structure, use cases, and security best practices.
Read more →SQL Formatting Best Practices
SQL style guide with naming conventions and optimization tips.
Read more →