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JavaScript Minifier

Minify JavaScript code to reduce file size. Remove comments, whitespace, and line breaks for production-ready JS.

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Original:474 bytes
Minified:282 bytes
Saved:40.5%
Input JavaScript
Minified Output
function greet(name){const message="Hello,"+name+"!";console.log(message);return message;}const users=["Alice","Bob","Charlie"];users.forEach(function(user){greet(user);});class Person{constructor(name,age){this.name=name;this.age=age;}sayHello(){console.log("Hi,I'm "+this.name);}}

What is JavaScript Minifier?

JavaScript Minifier is a free online tool that compresses JavaScript code by removing unnecessary characters like whitespace, comments, and line breaks. Minified JavaScript files are smaller, load faster, and improve website performance. This tool processes code entirely in your browser for privacy and security.

Common Use Cases

Production Deployment

Minify JavaScript before deploying to production for faster page loads.

Bandwidth Reduction

Reduce JavaScript file sizes to save bandwidth and hosting costs.

Performance Optimization

Improve Core Web Vitals scores by reducing JavaScript payload.

Build Pipeline

Quick minification for small projects without setting up build tools.

How to Use This Tool

  1. Paste your JavaScript code into the input field
  2. Toggle options for comment removal, whitespace, and line breaks
  3. View the minified output in real-time
  4. Copy or download the minified JavaScript file

Frequently Asked Questions

Does minification change my code behavior?
No. Minification only removes whitespace, comments, and shortens variable names. The functionality remains identical.
How much smaller will my code be?
Typically 30-70% smaller depending on code style, comments, and formatting. Heavily commented code sees larger reductions.
Should I minify during development?
No. Keep readable code during development. Only minify for production builds to maintain debuggability.
Is my code secure?
Yes! All processing happens locally in your browser. Your code never leaves your device.

JavaScript Minifier is a free online tool that requires no signup or installation. It works directly in your browser, keeping your data private and secure.