JWT Decoder & Token Inspector
Free online JWT Token Decoder. View decoded header claims, payload JSON, algorithm signatures, and check payload expiration without sending token to server.
- No login
- Free to use
- Processes locally
- No files uploaded
Try the JWT Decoder & Token Inspector
Processed locally in your browser
Your input and generated output are processed locally and are not sent to our servers for tool execution.
Examples
Decode header and payload (unsigned sample)
eyJhbGciOiJub25lIn0.eyJzdWIiOiIxMjMiLCJuYW1lIjoiQWRhIiwiaWF0IjoxNTE2MjM5MDIyfQ.
{
"header": { "alg": "none" },
"payload": { "sub": "123", "name": "Ada", "iat": 1516239022 }
}Features
- Inspect tokens and hashes locally
- Never send secrets to a server for processing
- Copy digests and decoded claims safely
- Download output when supported
- No account required
How to use JWT Decoder & Token Inspector
- Open JWT Decoder & Token Inspector in your browser.
- Paste your input or choose Open local file when available.
- Configure options if shown, then run the primary action.
- Review the result, then copy or download the output.
Use cases
- Inspect JWT claims during local debugging
- Generate hashes for checksums and fixtures
- Create strong passwords for staging accounts
- Verify encoding without sending secrets remotely
Technical reference
| Property | Supported |
|---|---|
| Input | Text or files accepted by JWT Decoder & Token Inspector |
| Output | Transformed text, code, or downloadable result |
| Execution | 100% client-side in a modern browser |
| Account | Not required |
| Upload destination | None — Open local file stays in-browser |
| Output actions | Copy and download when available |
Common errors & troubleshooting
Invalid JWT format
Cause: A JWT must have three Base64URL parts separated by dots.
Fix: Paste a full token (header.payload.signature) without line breaks.
Decode succeeded but signature not verified
Cause: Browser decode shows claims only.
Fix: Treat decoded claims as untrusted until verified with the correct key on your backend.
Privacy and security
- JWT Decoder & Token Inspector: treat decoded tokens and hashes as sensitive. Decoding does not prove authenticity.
- Your input and generated output are processed locally and are not sent to our servers for tool execution.
- Opening a local file uses the browser File API; the file is not uploaded to UtilityKit.
- We may collect anonymous product analytics (for example page views). Tool contents are not included in those events.
- Decoding a JWT does not verify its signature or authenticity.
- Do not paste production secrets into shared or untrusted devices.
- JWT Decoder & Token Inspector runs in your browser; extremely large inputs may be slow or limited by device memory.
- Results depend on your browser’s JavaScript engine and available APIs.
Frequently asked questions
What is JWT Decoder & Token Inspector?
JWT Decoder & Token Inspector is a free UtilityKit utility that runs in your browser so you can complete the task without installing software.
Is my input uploaded?
Your input and generated output are processed locally and are not sent to our servers for tool execution.
Do I need an account?
No. You can use this tool without signing up.
Can I download the output?
Yes, when the tool supports download — use the Download control next to Copy.
Does it work on mobile?
Yes. The layout switches to a mobile-friendly Input / Output experience on smaller screens.
What file size is recommended?
For a smooth experience, keep typical text payloads under a few megabytes. Very large files may hit browser memory limits.
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