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Bethemesh
Security & privacy

JWT decoder

Read the contents of a JSON Web Token, inspect its claims and important timestamps directly in your browser without uploading the token.

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Customize the result, check the live preview, then copy the code.

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Responsive and automatically resized by Bethemesh.

  • 100% local
  • Instant
  • Free
  • No account
  • Works offline
  • Clipboard

The token is decoded only; its signature is not verified.

Why use this tool?

Inspect a JWT header and payload locally. Decoding does not automatically verify its signature.

100% local and secure

Your data stays on your device and is never sent to our servers.

Smart processing

Generate or verify sensitive data with clear and immediate controls.

Supported formats

Strings, keys, hashes, and technical formats depending on the security function.

Save time

Get a clean, ready-to-use result in seconds without installing software or configuring a complex workflow.

Fonctionnement

How does this tool work?

JWT decoder processes your data directly in the browser using the logic specific to this tool. Read the contents of a JSON Web Token, inspect its claims and important timestamps directly in your browser without uploading the token. Start by entering the required values or content, then adjust the available options before reviewing the result. The workflow is designed to stay clear and repeatable: changes to the inputs are handled by the relevant engine so you can check the output quickly before copying, downloading, or reusing it in another step of your work.

Use cases

Everyday use

Use JWT decoder to complete a common task quickly without installing additional software or preparing a complicated manual process.

Result verification

Use JWT decoder to check a value or transformation produced elsewhere and identify an input or method mistake more easily before relying on it.

Local workflow

Include JWT decoder in a browser-based workflow when you want a simple, repeatable process that keeps processing as local as the tool allows.

Guide

How to use this tool

  1. 1

    Paste the token

    Add the complete JWT in the input field.

  2. 2

    Decode the sections

    Review the header and payload as JSON.

  3. 3

    Check the claims

    Check expiry dates, issuer and other claims.

Tips and best practices

  • Work on a copy when your data is important.
  • Review the result before reusing it in another application.
  • Processing takes place directly in your browser.

Frequently asked questions

Is a decoded JWT necessarily valid?

No. Reading its contents does not prove authenticity or signature validity.

Is my data uploaded?

No. Processing happens locally in your browser.

Can I use this tool for free?

Yes. The tool is free and requires no account.

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