JWT Decoder

Decode a JSON Web Token header and payload and show expiry dates. Runs locally. 🔒 Runs in your browser

Output

How to use the JWT Decoder

  1. Paste your text in the Input box, drop a file on it, or click "Example" to try it.
  2. The output updates instantly as you type.
  3. Click Copy or Download. Use "Use as input" to chain another operation.

About this tool

Decode a JSON Web Token header and payload and show expiry dates. Runs locally. It is part of the free Developer Tools collection on Online Tools Harbor. Everything happens locally in your browser, so it is fast and private.

Frequently asked questions

Is the JWT Decoder free?

Yes. The JWT Decoder is completely free to use, with no sign-up and no limits on normal use.

Is my data safe?

Yes. This tool runs entirely in your web browser using JavaScript. Your text is never uploaded to our servers.

Is there a size limit?

There is no fixed limit: it depends on your device. Several megabytes of text are processed in a fraction of a second on most computers.

Does it work on mobile?

Yes, it works in any modern browser on phones, tablets and computers. No app to install.

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