JWT Encoder/Decoder;

The JWT Encoder/Decoder is a free online tool that helps you encode, decode, and debug JSON Web Tokens (JWT). View header, payload, and signature details, validate token structure, and verify signatures. Perfect for developers working with authentication, API security, and JWT-based systems. All processing happens locally in your browser for complete privacy.

What is JWT Encoder/Decoder?

The JWT Encoder/Decoder is a powerful free online tool that helps you encode, decode, and debug JSON Web Tokens (JWT). View header, payload, and signature details, validate token structure, and verify signatures. Perfect for developers working with authentication, API security, and JWT-based systems.

Why Use a JWT Tool?

JSON Web Tokens are widely used for authentication and authorization in modern web applications. Our tool makes it easy to inspect JWT tokens, debug authentication issues, and understand token structure.

Unlike other tools that only decode, our tool also encodes JWTs and provides detailed validation feedback.

How to Use This Tool

Using the JWT Encoder/Decoder is simple and straightforward:

1. Paste Token: Paste your JWT token to decode and inspect.
2. View Parts: See header, payload, and signature separately.
3. Validation: Check if the token is valid and properly formatted.
4. Encode: Create a new JWT with custom header and payload.
5. Copy: Copy the encoded token to your clipboard.

Key Features

• Decode: Split JWT into header, payload, signature
• Encode: Create JWT from custom header and payload
• Validation: Check token structure and format
• Base64 Decoding: View decoded header and payload
• Copy: Copy encoded token with one click
• Clear: Reset the tool with one click
• Privacy First: All processing is local
• Responsive Design: Works on all devices

Perfect For

This tool is ideal for developers, security engineers, system administrators, and anyone working with JWT-based authentication.