JWT Signer

Sign and verify JSON Web Tokens locally.

Sign and verify JSON Web Tokens entirely in your browser. Pick HS, RS, PS, ES or EdDSA, edit the claims, generate a keypair, and watch the token decode live with humanized expiry. A prominent pass/fail banner confirms the signature. Keys and tokens never leave your machine.

Processes your input on your device without uploading it. Libraries or models may need downloading. No site account is required.