JavaScript Minifier Online

Minify JavaScript by removing whitespace and comments. Free online JS minifier — see exact byte savings. Runs entirely in your browser, no upload needed.

Remove Comments Strip Whitespace Show Savings No Upload Free

Paste your JavaScript

Minified Output

Quick reference

What it is

Removes comments and whitespace from JavaScript to reduce file size. Basic minification suitable for simple scripts and small projects.

How to use it

Paste your JavaScript in the input
Click Minify JavaScript
The minified output appears with a size report
Click Copy Output to use it

When you need this

Reducing JavaScript file size before deploying
Cleaning up a small script for production
Checking how much whitespace is in your JS
Quick minification without installing a build tool

Good to know

This is basic whitespace removal — for complex JS use Terser or esbuild
Single-line // and block /* */ comments are both removed
Minification is not obfuscation — the code is still readable if formatted
Variable names are not changed — use Terser for full name mangling

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