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JWT Generator

Create and sign JSON Web Tokens using HS256 (HMAC-SHA256) directly in your browser. No server involved.

Header JSON

Payload JSON

Secret Key

Encoded JWT — click to copy

Click to copy Signed JWT will appear here…

About JWT Generator

JWT Generator is a free, browser-based utility built for developers and engineers who need a fast, reliable way to create and sign json web tokens using hs256 (hmac-sha256) directly in your browser. no server involved. Whether you're debugging an API response, preparing data for deployment, or validating configuration files, this tool handles the job in seconds — with zero server calls. Everything runs locally in your browser, so your source code and data stay private.

How to Use

Enter or paste your input Type or paste your data into the input area. You can also use keyboard shortcuts (Ctrl+V) for quick pasting.

Configure options Adjust any settings or options above the input area to customize the output format and behavior.

Process your data Click the primary action button to process your input. The result appears instantly — no server round-trips.

Review the output Check the output area for your processed result. Any errors or warnings will be displayed clearly.

Copy or download Use the Copy button to copy the result to your clipboard, or download it as a file if that option is available.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use JWT Generator?

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Instant Results, Zero Setup No need to install CLI tools, configure environments, or write scripts. JWT Generator gives you the result instantly in your browser — paste, click, done.

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Your Code Stays Private All processing runs locally using JavaScript. Your source code, API keys, tokens, and configuration data never leave your browser — not even temporarily.

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Part of Your Dev Workflow Bookmark this tool alongside your IDE and terminal. When you need a quick format, encode, or validation, it's one tab away — faster than installing yet another npm package.

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Use It Anywhere Works on any device with a modern browser — laptop, tablet, or phone. Perfect for quick fixes when you're away from your development machine.

Frequently Asked Questions

This tool signs JWTs using HS256 (HMAC with SHA-256), the most common JWT algorithm. The signing uses the browser's built-in WebCrypto API (crypto.subtle) — no external libraries needed.

Yes. All computation runs entirely in your browser. Your secret key and payload data are never transmitted to any server. Use the browser's DevTools Network tab to verify no requests are made.

iat (issued at) is a Unix timestamp for when the token was created. exp (expires at) is when the token expires. Both are standard JWT claims defined in RFC 7519. Use the preset buttons to quickly set exp relative to now.