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Merlin Tools

Free. Client-side. No sign-up.

Developer tools that
never touch your data.

cURL to code, JWT decoder, formatter, regex, hashing and more. Everything runs in your browser: your code, tokens and secrets stay on your machine.

Why they're different.

Not marketing: it's how they're built.

Your data never leaves the browser

Everything runs client-side: no upload, no server round-trip. Paste a token, a curl command, a secret, a whole file: it stays on your machine. That's a real security property, not a privacy-policy line.

No sign-up, no limits, no ads

Every tool is free, with no account, no rate limit, no cookies and no tracking. The features other sites lock behind a paywall are just here, in the open.

Deterministic, not AI

Real algorithms on your real input: same input, same output, every time. No model guessing, nothing to get quietly wrong.