Developer tools

Format, decode, test, and generate — the everyday dev utilities, running with zero server round-trips.

JSON formatting and validation, JSON to CSV and back, a live regex tester, a JWT decoder, Base64 and URL encoding, HTML entity conversion, UUID generation, SHA hashing, and an SVG optimizer. Developers paste production data into online tools constantly — API responses with customer records, JWTs with live session claims, connection strings inside configs. Pasting those into a tool that posts to a server is a quiet data leak. Every tool here runs locally in your browser: the JWT never leaves the page, the JSON is parsed on your device, the hashes come from Web Crypto. Live-as-you-type, no signup, and they work offline once loaded.

Every developer tool

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All files • or paste with ⌘V

Nothing has left this page since you opened the tool. Show network activity

The browser enforces this: the site’s security policy only lets the page talk to the code libraries’ servers and an anonymous usage counter (tool name, file type, size range). A request carrying your file to anywhere else would be blocked before it left.

Check it yourself: open your browser’s developer tools, go to the Network tab, and run the tool. Or turn off Wi-Fi once the tool has loaded; it keeps working.

Every developer tool

Drop your file here

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