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JWT Encoder & Signer

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Build and sign a JWT — pick HS256 / HS384 / HS512, paste a header and payload (JSON), provide your secret, get a signed token. Uses Web Crypto API; your secret never leaves the browser.

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How to use JWT Encoder / Signer

  1. Set algorithm + secret.
  2. Type or paste the header and payload JSON.
  3. Click Encode JWT.
  4. Copy the signed token.

What is JWT Encoder / Signer?

Useful for testing API endpoints that expect signed JWTs. The signing happens in-browser via the Web Crypto API's HMAC subtle.sign call. For RS256/ES256 (asymmetric) signing, you'd need a separate key management flow — those aren't supported yet.

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FAQ

Is my secret sent anywhere?
No — all signing is local via Web Crypto. The secret stays in memory.
Does it support RS256 / ES256?
Not yet — only HMAC variants. RSA / ECDSA require private-key management.

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