Processed locally
Unix Timestamp Converter
Convert Unix seconds, milliseconds and readable dates in both directions.
Developer tools / JWT Decoder & Inspector
JWT Decoder & Inspector
Decode JWT headers and claims, inspect dates and explain token structure.
Processed locallyYour files never leave your device.
Loading local tool…
Continue working
Related tools
Processed locally
JSON Formatter & Validator
Format, minify and validate JSON with precise syntax errors.
Built for the task
Fast, focused and private.
What this tool does
Decode JWT header and payload data locally. Inspect claims and expiry without sending the token anywhere.
How privacy works
The input stays on this device. Processing begins only after you interact with the workspace, and the page does not contain a file-upload endpoint.
Frequently asked questions
Is JWT Decoder & Inspector free?
Yes. The tool is free to use and does not require an account.
Is my data uploaded?
No. This tool performs its work locally in your browser. Your input is not sent to NimbleWebTools.
What happens when I close the page?
Inputs and generated results are held by the current browser tab. Temporary download URLs are released when the page closes or resets.
Which browsers are supported?
Use a current browser with modern JavaScript and Web API support. The page reports a clear error when a required capability or format is unavailable.