JWT Decoder & Signature Verifier

Securely decode JSON Web Tokens and verify HS256 signatures via PHP backend.

Encoded JWT Token Secret Key (Optional - for Verification)

Header (Algorithm & Type)

Payload (Data)

Signature Status

How to Use This Tool

1. Provide Input: Paste your encoded JWT token. Optionally, provide the HS256 secret key if you want to verify the signature.

2. Execute Action: Click Decode & Verify.

3. Get Results: The secure processing engine decodes the Base64Url headers/payload and instantly computes the HMAC signature to verify authenticity without exposing your secret.