Encoding tool

JWT Decoder

Decode JWT header and payload values without leaving the browser.

JWT token

Decoded output

What This Tool Does

The JWT decoder lets you inspect the header and payload sections of a token without sending it to a server. It is useful for debugging auth flows, reviewing claims, and checking token structure during development.

This page is designed for fast browser-based workflows, so you can move from input to result without installing extra software. Decodes header and payload locally in the browser. Helpful for auth debugging and claim inspection. Related tools such as String Encoder and Hasher, Query String Encoder can help when you need the next step in the same workflow.

How To Use It

Paste a JWT into the input field.
Review the decoded header and payload JSON.
Use the output to inspect claims or troubleshoot token content.

Most users can finish the task in a few clicks or a quick paste-and-review workflow, which makes this kind of browser tool useful for repeat checks as well as one-off tasks.

Why Use This Tool

Decodes header and payload locally in the browser.
Helpful for auth debugging and claim inspection.
Does not attempt to validate signatures or call external services.

FAQ

Does this verify signatures?

No. It only decodes the token structure and contents.

What parts are decoded?

The header and payload are decoded from Base64URL. The signature remains untouched.

Is my token uploaded?

No. The decoding runs in your browser.

Common Use Cases

Decodes header and payload locally in the browser. This is especially helpful when you want a quick result inside the browser instead of switching between multiple apps or manual cleanup steps. A related follow-up task is often String Encoder and Hasher.

Helpful for auth debugging and claim inspection. This is especially helpful when you want a quick result inside the browser instead of switching between multiple apps or manual cleanup steps. A related follow-up task is often Query String Encoder.

Does not attempt to validate signatures or call external services. This is especially helpful when you want a quick result inside the browser instead of switching between multiple apps or manual cleanup steps.

Related Tools

Browse connected tools to continue the same workflow without starting over. These links help with adjacent tasks such as cleanup, conversion, validation, generation, and follow-up checks.

String Encoder and Hasher Query String Encoder