Developer tools
Tools for coders and engineers. All tools are free and run in your browser.
Private JSON Formatter & Validator
Format and validate JSON securely offline in your browser. 100% local—no data sent to servers.
Base64 Encoder / Decoder
Encode and decode Base64 strings instantly.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
Code Diff Checker
Compare two blocks of text or code and highlight differences.
Regex Tester
Test regular expressions with live match highlighting and saved patterns.
JWT Decoder
Decode and inspect JWT tokens — header, payload and expiry.
Cron Expression Generator
Build cron expressions visually and see them in plain English.
Mock Data Generator — Users, APIs & JSON
Generate fake users, IPs, UUIDs, credit cards, and custom JSON instantly.
SQL Formatter
Format and beautify SQL queries with dialect support.
CSV ↔ JSON Converter
Convert CSV to JSON and JSON to CSV with live preview.
XML / HTML Formatter
Format, validate and minify XML and HTML with error highlighting.
Code Snippet Manager
Save, organize and search code snippets with syntax highlighting.
Markdown Editor
Full markdown editor with live preview and document library.
Favicon Generator
Generate favicon.ico and PNG icons in all sizes from any image.