JS Minifier

About JavaScript Minifier

JavaScript Minifier is a free online tool that compresses your JS code by removing unnecessary whitespace, comments, and redundant characters. Smaller JavaScript files mean faster page loads and better website performance.

Features

• Remove all single-line (//) and multi-line (/* */) comments
• Preserve strings, template literals, and regex literals safely
• Collapse unnecessary whitespace while keeping code valid
• Remove unnecessary semicolons and blank lines
• Real-time size comparison with savings percentage
• Copy minified output or download as .js file
• 100% client-side — your code never leaves the browser

How to Use

1. Paste your JavaScript code into the input area
2. Click "Minify JS"
3. View the compressed output and size statistics
4. Copy the result or download the .js file

Common Use Cases

• Optimizing production JS before deployment
• Reducing file size for faster page loads
• Preparing JS for CDN delivery
• Comparing original vs. minified size
• Quick JS cleanup during development

FAQ

Is this minifier safe for all JavaScript?

This minifier handles strings, template literals, regex literals, and comments correctly for most common JavaScript code. For highly complex or edge-case code, always test the minified output. For production-critical code, consider using Terser or UglifyJS.

How much size reduction can I expect?

Typically 20–50% reduction depending on how much whitespace and comments your JavaScript contains. Well-commented code can see even higher savings.

Can I undo minification?

Use our JS Formatter to beautify minified JavaScript back into a readable format with proper indentation.

Is my JavaScript data sent to a server?

No. All processing happens in your browser. Your JavaScript code never leaves your device, ensuring complete privacy.