Free Online Developer Tools
Dozens of browser-based utilities for developers — JSON formatter, encoders, regex tester, JWT decoder and more.
JSON Formatter
Format, validate and minify JSON in your browser.
Base64 Encoder / Decoder
Encode and decode Base64 text instantly.
URL Encoder / Decoder
Encode and decode URL components.
Regex Tester
Test regular expressions with live highlighting.
JWT Decoder
Decode JWT header and payload locally — no verification.
HTML / CSS / JS Minifier
Lightweight minifier for HTML, CSS and JS snippets.
About our developer tools
Every tool in this category was built to be fast, private, and easy to use. Most run completely in your browser, so your files never leave your device. Whether you're working from a phone, tablet, or laptop, you'll get the same instant experience without sign-ups or watermarks.
Pick a tool above to get started, or use the search bar to jump straight to what you need. New utilities are added regularly based on what people search for most.