JavaScript Minifier

What the JavaScript Minifier does

The JavaScript Minifier removes comments and unnecessary whitespace from JS code to reduce its file size for production, while keeping the logic functionally identical.

How to use it

1. Paste your JavaScript into the box.
2. Click Minify JavaScript.
3. Click Copy minified JS to copy the compressed output.

Common uses

• Shrinking a script's file size before deploying it to a production website.
• Preparing a small utility script for embedding inline without excess bytes.
• Compressing JavaScript for a performance audit or page-weight budget.
• Cleaning up whitespace-heavy code copied from a tutorial or Stack Overflow answer.
• Comparing before/after file sizes for a report on optimization work.

Good to know

This is basic minification (whitespace and comment removal) rather than full-scale optimization — production build tools like Terser or esbuild also rename variables to shorter names and eliminate dead code, which shrinks output further; for a small script or one-off snippet this tool is fine, but for a full production bundle a proper build pipeline will get better results.

Production JavaScript minifiers used in real build pipelines (like Terser, used by most modern bundlers) go considerably further than removing whitespace and comments — they also rename local variables to shorter names, eliminate provably dead code, and fold constant expressions, which is why professionally minified bundles are often 30-50% smaller than a simple whitespace-stripped version of the same code. This tool handles the basic case well for a quick one-off script, but a full production deployment should generally go through a proper build tool.