JWT Decoder
Decode JWT header and payload JSON in your browser without verifying signatures.
Privacy first
- Your files never leave your device
- Processing happens locally in your browser
- No upload to our servers
- No registration required
JWT Decoder
Decode JWT header and payload JSON without verifying signatures.
About this tool
Decode JWT tokens online to inspect header and payload JSON. This tool does not verify signatures.
How it works
Paste a JWT token into the decoder.
The tool splits the token into header, payload, and signature segments.
Header and payload are Base64URL-decoded and shown as formatted JSON without signature verification.
Frequently asked questions
Does this JWT Decoder verify signatures?
No. This tool only decodes JWT tokens. It does not verify signatures.
Is it safe to paste production tokens here?
The decoder runs client-side, but you should still avoid pasting sensitive tokens into any tool unless you understand the risk.
What parts of a JWT can I inspect?
You can inspect the decoded header and payload JSON. The signature is not validated.
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