JWT Decoder
Decode and inspect JSON Web Tokens (JWT). Shows header, payload, and signature. Free, runs locally — never logged.
About this JWT Decoder tool
JWT decoding is base64url + JSON. CheckHub splits the token into header and payload locally — nothing is transmitted.
How to use the JWT Decoder
- Step 1. Paste a JWT.
- Step 2. Read the header, payload, and signature.
- Step 3. Inspect the algorithm and claims.
Frequently asked questions
- Does this verify the signature?
- No, decoding does not verify. Verification needs the issuer's public key, which we don't fetch.
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