JS minifier

Free JS Minifier — Compress Your JavaScript

This tool minifies your JavaScript by removing unnecessary characters — whitespace, line breaks and comments — to produce a smaller file that runs identically but downloads faster. Paste your JS and get a leaner version ready to deploy.

JavaScript is often the heaviest and most performance-critical resource on a page, which makes shrinking it valuable. Beyond the download cost, JS has to be parsed and executed by the browser — and heavy scripts are the most common cause of poor Interaction to Next Paint (INP), one of the Core Web Vitals. Minifying reduces the bytes transferred, which speeds up loading and is the simplest first step in a broader effort to keep your JavaScript lean. It layers on top of Brotli or Gzip compression for additional savings.

Use this tool to minify a script before deploying, to compress a JS file quickly, or to gauge how much weight your scripts carry. For production projects, minification belongs in your build pipeline so every deploy ships compressed automatically — and it pairs well with deferring non-critical scripts and removing unused code, which together do the most for responsiveness. Smaller, well-managed JavaScript is one of the highest-impact things you can do for both load speed and INP.

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