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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; this one runs locally, but a token signed here is for testing only.

Base64 & URLJWT DecoderJWT GeneratorFile ↔ Base64HTML Entity Encode/DecodeBase32 Encode/DecodePunycode (IDN) Converter

How to use this tool

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

Frequently asked questions

Is my secret sent to a server?

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

Does this support RS256?

No, only HS256 (HMAC-SHA256).

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