JWT Decoder
Paste a JSON Web Token to read its header and payload as formatted JSON, with the standard claims (algorithm, issued-at, expiry, issuer, subject, audience) pulled out. The token is decoded in your browser and never sent anywhere.
- Runs entirely in your browser
- No sign-up, no watermark
- Free and unlimited
🔒 Your file stays on your device
How to use JWT Decoder
- 1
Open JWT Decoder and paste or type your text into the input box.
- 2
Adjust any options to match what you need.
- 3
The result updates instantly below — copy it with one click.
What you get
- Header + payload as pretty JSON
- Standard claims and expiry status
- Decoded locally — token never leaves your device
What happens to your files
This tool runs entirely in your browser. The file you choose is read into memory, processed on your device, and offered back as a download. Nothing is uploaded and nothing is kept once you leave the page.
There is no account, no email, no watermark and no daily limit. Come back whenever you need it.
Frequently asked questions
- Does this verify the signature?
- No. Verifying a JWT needs the signing secret or public key, which you should never paste into a website. This tool only decodes the readable parts.
- Is it safe to paste a real token here?
- The decoding happens entirely in your browser and nothing is transmitted. Still, treat production tokens as secrets and avoid pasting them into any tool you don't control.