JWT Decoder
Decode JWT tokens instantly to inspect header, payload, and common claims like expiration time. Everything runs privately in your browser.
- Decode header & payload
- View token claims clearly
- Private local processing
- No token sent to server
Paste a JWT token with three dot-separated parts.
Decoded token details will appear here.
JWT Decoder Online
Decode JWT tokens instantly to inspect headers, payload data, and common claims such as expiration, issuer, and subject. Safe browser-only processing with no server upload.
Where Is This Useful?
How to Use
- Paste JWT token.
- Click Decode.
- Review header and payload.
- Inspect claims.
- Copy values if needed.
What You See
- Header: algorithm and token metadata.
- Payload: claims and custom data as JSON.
- Claims: readable summary of common fields like
exp,iat,iss,sub.
Security Notes
- This tool decodes but does not verify signatures.
- Do not paste sensitive production tokens unnecessarily.
- Processing happens locally in your browser.
Frequently Asked Questions
Is this free?
Yes. The JWT decoder is free with no sign-up.
Is my token uploaded?
No. Decoding runs locally in your browser.
Does this verify signatures?
No. Use your identity provider or backend with the correct keys to verify signatures before trusting a token.
What is the payload?
The middle segment of a JWT, decoded as JSON containing registered and custom claims.
Why can I read a JWT?
Header and payload are only encoded, not encrypted. Signature verification proves they were not tampered with.
What does exp mean?
exp is the expiration time (Unix seconds). After that instant, the token should be considered expired.
Does it work on mobile?
Yes. Editors and the token actions sheet are optimized for small screens.
Can I copy decoded data?
Yes. Copy header, payload, or full output from the tool.
Related Tools