JWT Decoder
Decode the header and payload of a JWT to inspect its claims. This does not verify the signature.
Your file is processed locally in your browser and is not uploaded to our server.
This tool decodes a JWT's contents; it does not verify its signature.
How to use JWT Decoder
- 1Paste a JWT (JSON Web Token).
- 2The header and payload are decoded and shown as JSON.
- 3This does not verify the signature — it only decodes the readable parts.
Frequently asked questions
No. Decoding only reveals the claims inside the token. Verifying a signature requires the secret or public key, which this tool never asks for or has access to.
No — decoding happens entirely in your browser using standard Base64URL decoding.
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