Developer
JSON, regex, encoding and dev utilities.
Developer tools cover the quick utilities you reach for many times a day: formatting and validating JSON, testing a regular expression, encoding or decoding Base64 and URLs, and other small jobs that would otherwise need a script or a heavyweight IDE. They are aimed at programmers, API builders and anyone debugging data on the fly who wants a fast, distraction-free workspace in a browser tab. Everything runs locally on your machine, so the code, payloads and secrets you paste never leave your device — important when you are handling real data. No installs, no sign-up, no rate limits. Free, instant, and ready whenever you need to format, test or transform something in a hurry.
6 tools
All tools → Base64 Encode Decode Instantly convert any text to Base64 or decode Base64 back to plain text in your browser, with full Unicode (UTF-8) safety and one-click copy. JSON Formatter Paste messy or minified JSON and instantly get it beautified, validated with the exact error line, or minified — all in your browser. JSON to CSV Converter Paste a JSON array, get a clean CSV table you can download or copy in one second — and convert it back the other way too. Regex Tester Type a regular expression and sample text to see every match highlighted live, with captured groups and flags, without leaving the page. Text Diff Checker Paste two blocks of text and instantly see every added, removed, and changed line and word highlighted side by side, all in your browser. URL Encoder / Decoder Paste a URL or text and instantly percent-encode or decode it in your browser, switching between full-URL and single-component modes.