How to use the JWT Decoder
- Paste your text into the input box.
- The output updates automatically as you type.
- Copy the JSON or download it as a file.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This JWT Decoder processes everything locally in your browser tab. There is no server round-trip, no logging and no storage of your input. Prefer a native app? Read about JWT Decoder in DevT Pro.
Frequently asked questions
Is this JWT Decoder free?
Yes. This JWT Decoder is completely free to use with no sign-up, no limits and no ads inside the tool.
Is my data uploaded to a server?
No. The JWT Decoder runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Does this verify the JWT signature?
No. It decodes the header and payload so you can inspect them. Signature verification requires the secret or public key and should happen on your server.
Can I use the JWT Decoder offline?
Yes. JWT Decoder is also built into DevT Pro, a native app for Mac, Windows, iPad and Linux with 120+ developer tools that work fully offline. It is a $5.99 one-time purchase with no subscription.
