JWT decoder
Decode a JWT header, payload, signature bytes, and timestamp claims without uploading the token.
Decode a JWT header, payload, signature bytes, and timestamp claims without uploading the token.
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Signature not verified
Header
Payload
Signature
How to use JWT decoder
Inspect the decoded JSON and timestamps, but verify signatures and claims in the system that owns the signing key. Decoding alone does not establish trust.
Private, local processing
Your input and results are not uploaded or stored. They remain in this browser tab.
Frequently asked questions
What does JWT decoder do?
Decode a JWT header, payload, signature bytes, and timestamp claims without uploading the token.
Is my data uploaded?
Your input and results are not uploaded or stored. They remain in this browser tab.
What should I check when using JWT decoder?
Inspect the decoded JSON and timestamps, but verify signatures and claims in the system that owns the signing key. Decoding alone does not establish trust.