Is the output still valid JS?

Yes for typical code. It is conservative by design, but always test minified code before deploying.

Why minify JavaScript?

Smaller files download faster, improving page load times and Core Web Vitals scores.

JavaScript Minifier

Shrink JS by stripping comments and whitespace

Input JavaScript

Minified output

Minified JavaScript appears here…

Basic minifier: it removes comments and collapses whitespace, but it does not rename variables or apply advanced optimizations, so a dedicated tool like Terser will produce smaller output. Always test the minified code before using it in production. Everything runs in your browser, nothing is sent or stored anywhere.

About this tool

Every kilobyte of JavaScript costs load time. This basic minifier strips comments and redundant whitespace to shrink your scripts quickly.

It is honest about being basic: for production builds, a proper bundler minifies more aggressively. But for quick snippets, embeds and experiments, it is instant and free.