How to use Token Decoder
- Paste the text you need to decode into the input box.
- The result is computed live in your browser as you edit the input.
- Finish by choosing Copy to take the output with you.
About this tool
Token Decoder is a static, client-side tool with no backend. Token Decoder decodes a JSON Web Token in your browser, showing the header and payload without verifying secrets remotely.
Signature verification that needs a secret should be done in a trusted environment; Token Decoder focuses on decoding. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
What is Token Decoder for?
Token Decoder runs entirely on your device: add your input, and it decodes it locally in real time.
Is Token Decoder free to use?
Yes — Token Decoder is completely free, with no usage limits.
Does Token Decoder upload my data?
No — Token Decoder processes everything locally in your browser, so nothing you enter is uploaded or stored.
Does Token Decoder verify the JWT signature?
Token Decoder decodes the token locally so you can inspect its header and payload; verification needs the matching key.
Does Token Decoder work on mobile?
Yes — Token Decoder is just a web page and runs on any modern browser, including phones and tablets.