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.
16 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. Cron Expression Explainer Paste a cron expression and instantly get a plain-English description plus the next run times — no signup, computed entirely in your browser. CSS Minifier Paste CSS and instantly minify it for production or beautify it for reading — with the exact byte count and percentage saved, all in your browser. Hash Generator Type or drop a file and instantly get its MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes — all computed in your browser, nothing uploaded. HTML Formatter Paste HTML and instantly beautify it with clean indentation or minify it to the smallest size — with before/after byte savings, all in your browser. HTML to Markdown Paste HTML and instantly get clean, structure-preserving Markdown you can copy or download — converted entirely in your browser. 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. JWT Decoder Paste a JWT and instantly read its header and payload as formatted JSON, with expiry/issued-at timestamps turned into human-readable dates — all decoded in your browser, never uploaded. Markdown to HTML Paste Markdown and instantly get a live HTML preview plus the raw HTML source, ready to copy or download — all in your browser. Regex Tester Type a regular expression and sample text to see every match highlighted live, with captured groups and flags, without leaving the page. SQL Formatter Paste messy SQL and instantly get it beautified with consistent indentation and keyword casing, for the dialect you actually use — all in your browser. 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. URL Shortener Paste a long URL and get a clean short link in one click — no sign-up, no interstitial ad before the redirect, scanned for safety, with an inline QR code and an optional expiry and use limit. XML Formatter Paste raw or minified XML and instantly beautify it, check that it is well-formed with the exact error line, or minify it — all in your browser.