JWT Decoder Online
Decode JWT tokens online. Inspect the header, payload, claims, expiration and signature segments locally without uploading your token.
JWT decoder
Free JWT Decoder Online
This JWT decoder splits a JSON Web Token into readable header, payload and signature segments so you can inspect claims such as issuer, audience, subject, issued-at time and expiration locally in your browser.
How to use this tool
- Paste your text into the input field.
- Click the action button to process it locally in your browser.
- Copy or download the result.
Privacy
This tool runs in your browser. Your text is not uploaded to a server.
Decode JWT tokens locally
Paste a JWT token to decode the header and payload into readable JSON. The decoding runs locally in your browser and your token is not uploaded to a server.
Use this tool to inspect common claims such as sub, iss, aud, exp, iat, roles and custom application claims.
Important security note
JWT decoding is not the same as verification. This tool helps you read token contents, but it does not prove that a token is trusted by your backend.
Avoid pasting production secrets or highly sensitive tokens into any online tool unless you understand the privacy and security risks.
JWT Decoder Online FAQ
Is my JWT uploaded?
No. The JWT decoder runs locally in your browser and does not upload your token to a server for decoding.
Can this verify a JWT signature?
No. This decoder shows the header, payload and signature segment. Signature verification requires the correct secret or public key and backend-specific rules.
What parts of a JWT can I see?
You can inspect the decoded header and payload JSON, including claims such as issuer, audience, subject, issued-at time and expiration time when present.
Is Base64URL different from Base64?
Yes. JWTs use Base64URL encoding, which is URL-safe and commonly uses three dot-separated segments.