tools

JWT Signer

100% local v1.1.3

Sign and verify JSON Web Tokens with HMAC, RSA, ECDSA and EdDSA. Generate keypairs, edit claims, and watch the token decode live. Everything runs in your browser — keys and tokens are never sent anywhere.

Payload (claims)

valid JSON

Add claim:

Algorithm

Secret

Public key (SPKI PEM)

Your signed JWT will appear here.

Signed JWT

Token

Algorithm

Secret

Paste a token above to preview its header, payload and claims.

Header

Payload

Signature

About this tool

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.

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