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JWT Encoder

Build a demo JWT from header and payload JSON in your browser.

Tool workspace

Learning/debug only — not for production auth. Secret stays in your browser.

Builds a demo JWT locally. Blank secret → unsigned (alg: none). With secret → local HS256. Not for production authentication.

How it works

Enter header and payload JSON. Leave the secret blank for an unsigned token (alg: none). Provide a secret to sign locally with HS256.

This is for learning and debugging — not production authentication. Secrets never leave your browser.

Empty fields clear the result when all inputs are blank.

Examples

  • Header + payload, no secret → unsigned JWT ending with a trailing dot
  • With secret → HS256-signed JWT

Privacy

Privacy: this tool builds JWTs locally in your browser. We do not log or store secrets or tokens. Login is not required.

FAQ

Is this safe for production auth?

No. Use a proper identity provider and key management in production.

Is my secret uploaded?

No. Signing runs entirely in your browser.

Do I need an account?

No. All published tools work for guests without login.

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