Free Online JWT Generator Tool
Generate custom JSON Web Tokens (JWTs) with your own header and payload. Choose from multiple signing algorithms including HS256, HS384, HS512, and more. Perfect for testing authentication flows, API development, and prototyping. 100% client-side.
Computing signature...
All JWT generation happens in your browser using the Web Crypto API · 100% client-side
How to Use the JWT Generator Tool
Configure Header
Select your signing algorithm (HS256, HS384, HS512) and optionally customize the header fields like kid or typ.
Set Payload Claims
Add your JWT claims in the payload editor. Pre-filled with standard claims like iss, sub, exp, and iat. Add or remove claims as needed.
Enter Secret Key
Provide a secret key (for HMAC algorithms) to sign your token. The tool generates the complete JWT with signature ready to use.
Powerful JWT Generator Features
Everything you need to generate signed JWT tokens for testing and development — entirely in your browser.
Multiple Algorithms
Supports HS256, HS384, and HS512 HMAC-based signing algorithms. Select the one that matches your application's requirements.
Custom Payload Editor
Edit the payload as a JSON object with pre-filled standard claims. Add, modify, or remove claims freely.
Editable Header
Customize the JWT header including kid (key ID), typ, and other header parameters for advanced use cases.
Auto-Generated Claims
Automatic iat (issued at) timestamp generation. Configure exp (expiration) with presets or custom values.
Copy Token
Copy the complete signed JWT to your clipboard with a single click. Ready to use in your API calls.
Live Token Preview
See your generated JWT update in real-time as you modify the header, payload, or secret key.
Clear & Sample
Load a sample configuration to get started quickly, or clear everything and build from scratch.
100% Client-Side
All token generation happens in your browser. Your secret keys and payload data never leave your device.
Why Use Our JWT Generator Tool
The easiest way to generate signed JWT tokens for testing and development. No setup, no secrets leaving your browser.
100% Free
No hidden fees, no premium plans, no usage limits. Generate as many JWT tokens as you need.
Privacy First
Your secret key and payload data never leave your browser. Everything is processed locally.
Instant Generation
See your signed JWT token update in real-time as you type. No waiting, no page reloads.
Developer-Friendly
Perfect for testing authentication middleware, generating test tokens for API development, and prototyping login flows.
Key Highlights
- No sign-up or registration required
- Processes everything in your browser — zero server uploads
- Supports HS256, HS384, and HS512 algorithms
- Auto-generates iat and exp timestamps
- Customizable header and payload
- Works on any device — desktop, tablet, or mobile
Frequently asked questions
What is a JWT token?
JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It consists of three parts: a header (algorithm & token type), a payload (claims/data), and a signature (for verification) — all Base64URL-encoded and separated by dots.
Is this JWT generator really free?
Yes, completely free. There are no hidden charges, no usage limits, and no premium features locked behind a paywall. Generate as many tokens as you need.
Is my secret key secure?
Absolutely. All JWT generation happens entirely in your browser using JavaScript. Your secret key and payload data are never sent to any server, stored, or logged. They stay completely private on your device.
What algorithms are supported?
Currently supports HMAC-based algorithms: HS256 (SHA-256), HS384 (SHA-384), and HS512 (SHA-512). RSA and ECDSA algorithms require private/public key pairs and are not supported in this browser-based tool.
How do I use the generated JWT?
Copy the generated JWT and use it as a Bearer token in your API requests (Authorization: Bearer <token>). It's perfect for testing authentication middleware, API endpoints, and login flows during development.
Can I customize the header?
Yes! You can edit the header JSON to add custom parameters like kid (Key ID), typ (token type), or any other registered header parameter defined in RFC 7515.
What claims should I include?
Standard claims include: iss (issuer), sub (subject/User ID), aud (audience), exp (expiration timestamp), iat (issued at timestamp), and jti (unique token ID). You can add any custom claims your application needs.
Do I need to install anything?
No installation required. The JWT generator works entirely in your web browser. Just open the page and start generating tokens. No downloads, no plugins, no setup.
Can I use this on my phone?
Yes, the tool is fully responsive and works on all devices — desktops, tablets, and smartphones. The interface adapts to your screen size for comfortable use anywhere.