Diff Tool
Decodes and validates JWT tokens for debugging and security analysis. It extracts claims, expiration details, and verifies signatures if applicable.
Diff Tool — Free Online Tool
Compares two text inputs and highlights their differences. Useful for code reviews, debugging, and tracking changes between document versions.
How to use the Diff Tool
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Is the Diff Tool free to use?
Yes. The Diff Tool is completely free, with no signup, no ads inside the tool, and no hidden limits.
Does the Diff Tool upload my data?
No. The Diff Tool processes everything locally in your browser. Your input is never sent to a server, so it stays private even on shared devices.
Does the Diff Tool work offline?
After the page loads, the Diff Tool runs entirely in your browser, so it keeps working without a network connection.
Free & private — why use this Diff Tool
The Diff Tool runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.