JWT Decoder

Decode a JSON Web Token's header and payload in your browser (signature not verified).

Runs in your browser — your file never leaves your device

Frequently asked questions

Is JWT Decoder free to use?

Yes — JWT Decoder is completely free with no limits, no watermarks and no sign-up. It runs in your browser, so there is nothing to pay for.

Are my files uploaded or stored anywhere?

No. This tool does all its work locally in your browser using your own device's power. Your files never leave your device and we never see them.

Do I need to install anything or create an account?

No installation and no account needed. JWT Decoder works on any modern browser — Windows, Mac, Linux, Android and iPhone.

How do I use JWT Decoder?

Open the tool, add your file (or paste your content), adjust any options, then press “Decode JWT”. Your result is ready to download in seconds.

Convert colours between HEX and RGB.

Convert Unix timestamps to/from dates.

UPPER, lower, Title, camelCase, snake_case…

Replace text, with optional regex.

Grades + credits → your GPA.

Add, subtract, multiply, divide fractions.