CodeItBro

JavaScript Minifier

Minify and compress your JavaScript code to reduce file size and improve page load performance. Remove comments, whitespace, and optionally mangle variable names.

Minification Options

Optimize Your JavaScript

Reduce JavaScript file sizes for faster page loads and improved performance. Our minifier removes unnecessary characters, compresses code, and optionally mangles variable names while preserving functionality.

Production Ready

Why Use This Tool?

Faster Load Times

Smaller JavaScript files mean faster downloads and improved page performance.

Comment Removal

Strip out comments and unnecessary whitespace for production-ready code.

Configurable Options

Control compression level, comment handling, and variable name mangling.

100% Private

All processing happens in your browser. Your code is never sent to any server.

How this JavaScript Minifier works

This optimization utility compresses JavaScript files removing whitespace, shortening variable names, and eliminating comments reducing file sizes for faster web page loading and improved performance. Minification decreases bandwidth consumption, accelerates script parsing, and improves Core Web Vitals metrics affecting search rankings and user experience. The minifier strips unnecessary characters between tokens, renames local variables to single letters, removes dead code branches, inlines constant values, and applies safe transformations preserving runtime behavior. Users upload JavaScript files or paste code receiving minified output with significant size reductions, configure aggressiveness levels balancing compression versus compatibility, and generate source maps linking minified code to originals for debugging. Validation modes ensure output executes identically to input, comparison displays show size savings percentages, and integration with build pipelines automates minification during deployment. Applications include production deployment reducing page weight, improving mobile performance on limited bandwidth, or combining with compression (gzip, Brotli) for maximum transfer efficiency.

How to Use

1

Paste or Upload

Enter your JavaScript code or upload a .js file.

2

Configure

Choose minification options.

3

Export

Copy or download the minified JavaScript.

Example Usage

Minifying JavaScript by removing whitespace.

Input
function add(a, b) { return a + b; }
Output
function add(a,b){return a+b}

Frequently Asked Questions

What does a JavaScript minifier do?
A JavaScript minifier removes unnecessary characters like spaces, line breaks, and comments to reduce file size. Smaller JS files usually load faster in production.
Will minifying JavaScript change how my code works?
Minification should not change functionality if your code is valid. It mainly changes formatting and may shorten variable names. Always test after minifying, especially if you rely on specific names for debugging.
Why is my minified output throwing errors?
This typically happens when the input has syntax issues, missing brackets, or copied code with hidden characters. Fix the original code first, then minify again.
Should I minify JavaScript during development?
Usually no. Keep readable code while developing and debugging. Minify for production builds where performance and file size matter more.
Is this JavaScript Minifier secure?
Yes. This tool runs 100% client-side, so your code is processed in your browser and never uploaded to a server.

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The JS Minifier is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.