JWT Decoder
Free online JWT decoder. Decode JSON Web Tokens to view header and payload claims. Verify token structure and expiration details. Local browser processing, no signup, completely safe and private.
How to Use JWT Decoder
- 1Paste your JWT token into the input field
- 2The tool automatically decodes the header and payload
- 3Review the algorithm, token type, and claims
- 4Check expiration time and other time-based claims
Frequently Asked Questions
Does this tool verify JWT signatures?
No, this tool decodes the header and payload only, which are base64url-encoded and can be read by anyone. Signature verification would require the secret key or public key, which should never be shared or pasted into online tools for security reasons.
Is it safe to paste my JWT tokens into this tool?
Yes, completely safe. All processing happens locally in your browser and tokens are never sent to any server. However, you should still avoid sharing JWTs publicly as they may contain sensitive claims, personal information, or access to your accounts.
What information can I see in a decoded JWT?
You can see the header (algorithm, token type) and the payload which typically includes issued at time, expiration time, subject, issuer, audience, and custom claims like user ID, role, permissions, and any other data the server included in the token.
Is JWT Decoder free, and do I need to sign up or upload my files?
JWT Decoder is 100% free to use with no signup, no registration, and no usage limits. All processing happens locally in your browser - your files and data never leave your device, so no upload is required and your privacy is fully protected.