JWT Generator

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Sign a JWT with HS256 directly in your browser.

Runs in your browser — your files and text stay on your device

Sign a JSON Web Token with HS256 directly in your browser. It's useful for testing and development. Never paste a production secret into any website you don't fully trust; a token signed here is for testing only.

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Payload (JSON)Secret (HS256)

How to use this tool

1Edit the JSON payload (header is fixed to HS256/JWT).
2Enter a secret key.
3Click Generate JWT and copy the signed token.

Frequently asked questions

Is my secret sent to a server?

No — signing uses the browser's built-in Web Crypto API entirely locally.

Does this support RS256 or other algorithms?

No, only HS256 (HMAC-SHA256), the most common algorithm for single-service signing.

Is this safe to use for production secrets?

The math is correct, but avoid pasting real production secrets into any browser tool — use a real secret only in a trusted, offline context.

Guides

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