Free browser-based developer utilities — no login, no data sent to servers, works offline. Bookmark this page.
Data & Formatting
JSON Formatter
Beautify, minify, and validate JSON instantly. Highlights syntax errors and supports tree view.
Use Tool →Text Diff Checker
Compare two blocks of text and highlight exactly what changed. Line-by-line diff with color coding.
Use Tool →Regex Tester
Test and debug regular expressions with live match highlighting and capture group inspection.
Use Tool →Encoding & Security
Base64 Encoder / Decoder
Encode and decode Base64 strings instantly. Supports text, URLs, and file content.
Use Tool →JWT Decoder
Decode JWT tokens and inspect header, payload, and signature claims without sending data anywhere.
Use Tool →URL Encoder / Decoder
Encode and decode URL strings. Handles percent-encoding for query parameters and path components.
Use Tool →Generators & Utilities
Cron Expression Generator
Build and validate cron schedules visually. See plain-English description of any cron expression.
Use Tool →Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Shows local and UTC time.
Use Tool →UUID Generator
Generate v1 and v4 UUIDs in bulk. Copy single or multiple UUIDs with one click.
Use Tool →CSS Minifier
Minify CSS and show size savings. Remove whitespace, comments, and redundant rules instantly.
Use Tool →📚 Recommended Reading
Clean Code is required reading for every developer — write better, more maintainable code starting today.
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