EsyTool

JavaScript Minifier

Remove comments and collapse whitespace from JavaScript. All processing is done locally in your browser.

This is a basic minifier — it removes comments and collapses whitespace. For production use (dead-code elimination, tree-shaking, mangling), use a build tool like esbuild, Terser, or Rollup.

Minified output will appear here

How it works & FAQ
Client-Side Only

Why this is secure?

All JavaScript minification runs locally in your browser using pure string processing. Your code is never transmitted to any server.

Step-by-Step Guide

  1. 1Paste your JavaScript code into the input field.
  2. 2Click Minify JavaScript to compress and remove whitespace.
  3. 3Review the minified output and the size savings percentage.
  4. 4Copy the minified JS to use in your project.

Common Questions

What does a JavaScript minifier do?

A JavaScript minifier (also called a JS compressor) removes comments, unnecessary whitespace, and line breaks from your code to reduce file size. Smaller JS files load faster, improving page performance.

Is minifying JavaScript the same as obfuscating it?

No. Minification only removes whitespace and comments to shrink file size. Obfuscation renames variables and restructures code to make it hard to read. This tool performs minification only.

Will minification break my JavaScript code?

No. The minifier only removes safe characters — whitespace, comments, and unnecessary semicolons. The logic and functionality of your code remains identical.

How much can JavaScript minification reduce file size?

Typical JS files see a 20–40% size reduction from minification alone. Files with lots of comments and formatting can see even greater savings.

Can I minify JavaScript online for free?

Yes. This tool is completely free, works in your browser, and requires no account or signup. Paste your JS code and click Minify.

Zero Data Leaks

Your JavaScript code stays in your browser at all times. No code is uploaded or stored — processing is 100% client-side.