How to use JWT.io Decode
- Enter or paste your JWT into JWT.io Decode's input field to begin.
- The result is computed live in your browser as you edit the input.
- When it looks right, Copy to save it.
About this tool
There is no server behind JWT.io Decode. JWT.io Decode decodes a JSON Web Token in your browser, showing the header and payload without verifying secrets remotely.
The token is parsed on your device and never transmitted. Your input never leaves the page, and no account or install is required.
Frequently asked questions
What does JWT.io Decode do?
JWT.io Decode runs entirely on your device: add your input, and it decodes it locally in real time.
Does JWT.io Decode cost anything?
No — JWT.io Decode is completely free, with no sign-up and no hidden limits.
Where is my data processed by JWT.io Decode?
Entirely in your browser — JWT.io Decode keeps your data on your own machine and sends nothing anywhere.
Does JWT.io Decode verify the JWT signature?
JWT.io Decode decodes the token locally so you can inspect its header and payload; verification needs the matching key.
Can I use JWT.io Decode without a connection?
Yes — after the first load JWT.io Decode runs entirely offline.