JWT Decoder
Decode JWT headers and payloads to inspect token claims; decoding does not verify signatures.
FreeBrowserAbout JWT Decoder
Decode the header and payload of a JSON Web Token to inspect its claims. Use the readable JSON to debug authentication flows and compare what an identity provider returns across environments.
When to use this tool
- Inspect a subject or issuer claim during development.
- Compare claims from two identity provider configurations.
Limits to know before using it
Decoding does not verify the signature, expiry, audience or issuer. A readable payload is not evidence that the token is trustworthy.
Data handling and cost
The main operation runs in your browser; tool input is not uploaded for processing. The site can still use session cookies and collect operational or usage data as described in the privacy policy.
Free to use in your browser, with no sign-in needed.
Frequently Asked Questions
No. The token is decoded locally in your browser. The tool does not send the JWT, header, payload, or claims to any server.
No. JWT Decoder only Base64URL-decodes the header and payload so you can inspect their JSON content. It does not validate the signature, issuer, audience, expiry, or revocation status.
Use it to debug authentication flows, inspect claims during local development, compare environments, or confirm what an identity provider placed in a token. Do not treat decoded output as proof that a token is trusted.