Free Online Developer Tools
Fast, secure, and private — every tool runs entirely in your browser. Your data never touches any server.
All Tools
JSON Formatter
Format, compress and validate JSON data with syntax highlighting and error detection
Base64 Encode / Decode
Encode and decode Base64 strings — supports Chinese, Unicode and special characters
Regex Tester
Test and debug regular expressions in real-time with live match highlighting
UUID Generator
Generate random UUIDs (v4) in bulk — copy with one click
Timestamp Converter
Convert between Unix timestamps and human-readable dates in multiple formats
Color Converter
Convert colors between HEX, RGB, HSL and HSL — with live preview
URL Encoder / Decoder
Encode and decode URL components — perfect for query string manipulation
JWT Decoder
Decode and inspect JWT tokens — view header, payload and signature info
Latest from the Blog
10 Free Online Developer Tools to Supercharge Your Workflow in 2026
Discover essential free developer tools for 2026 — from JSON formatting to regex testing. All are privacy-first and run locally in your browser.
JSON Formatting 101: How to Debug JSON Data Like a Pro
Master JSON formatting, validation, and debugging. Learn common mistakes, best practices, and how to use a JSON formatter effectively.
Base64 Encoding & Decoding: What Every Developer Needs to Know
Learn how Base64 works, when to use it, and browser pitfalls. Includes practical examples with data URLs, JWT tokens, and Unicode handling.
The Complete Guide to Writing Better Regular Expressions
Practical regex patterns, named capture groups, common traps like catastrophic backtracking, and debugging techniques for daily use.