Skip to content
On-device · nothing uploaded

Read a JWT and check its signature

Read what is inside a JSON Web Token, check when it expires and verify its signature. Free, private, nothing uploaded.

How it works, privately

How it works, privately

  1. The tool opens right here. There is nothing to install and no account to make.
  2. Paste the token. Add the key to check the signature.
  3. What you type stays in this browser on this device. Nothing is sent to a server.

Questions

Is it free?
Yes. Encode & checksum is free to use, with no account, no sign-up and no daily limit.
Is what I type sent anywhere?
No. Encode & checksum runs inside your browser, on your own device. Nothing you type or make is sent to a server.
Does it work on my phone?
Yes. It works in an up-to-date browser on phones, tablets and computers. Very big files are quicker on a computer.
Do I need to install anything?
No. Open the page and use it. You can also add Toolbox to your home screen like an app.