How do I decode a JWT token?

Paste your JWT token into the input field. The tool will automatically decode the header and payload, showing you the JSON structure. You can optionally verify HS256 signatures by entering the secret key.

Is the JWT Decoder free?

Yes, this tool is completely free and works entirely in your browser. No data is sent to any server.

Can I verify JWT signatures?

Yes, you can verify HS256 signatures by entering the secret key. The tool will check if the signature is valid. Other signature algorithms are not currently supported.

🔑JWT Decoder

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Decode JSON Web Tokens (JWT) safely in your browser. Optionally verify HS256 signatures with a secret.

📥JWT Input

JWT Token

Header

Payload

🔐Signature & Verification

Signature

—

HS256 Secret (optional, for verification)

How this tool works

Enter JWT token

Paste your JSON Web Token (JWT) into the input field. JWTs have three parts separated by dots: header.payload.signature.

View decoded parts

The tool automatically decodes the header and payload, displaying them as formatted JSON. The signature is shown separately.

Verify signature (optional)

Enter your HS256 secret key and click "Verify HS256" to check if the token signature is valid.

Review results

See verification status: valid (green), invalid (red), or not available (amber). Decoding does not validate the token—only verification confirms authenticity.

Clear and start over

Click "Clear" to reset all fields and start with a new token.

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