Does minifying rename variables, or just remove whitespace?

This tool focuses on stripping comments and unnecessary whitespace — more aggressive minification (variable renaming, dead code elimination) is a separate, more involved optimization typically handled by build tools.

Will minifying break my JavaScript?

No, whitespace and comment removal doesn't change the code's logic or behavior — it should execute identically to the original.

Should I minify JavaScript I'm actively developing?

No, keep your working source readable — minify only the final version you're deploying to production.

Does JavaScript Minifier upload my files to a server?

No. JavaScript Minifier runs entirely in your browser using on-device processing, your files never leave your device.

JavaScript Minifier

Minify JavaScript by stripping comments and unnecessary whitespace.

Runs in your browser

JavaScript input

Simple whitespace/comment stripping — for full production minification (mangling, dead-code elimination), use a build-time tool like esbuild or Terser.

About this tool

Shipping unminified JavaScript to production wastes bandwidth and load time, but writing minified code directly isn't practical for actual development — you want readable code during development and a minified version for deployment. This tool minifies JavaScript by stripping comments and unnecessary whitespace, giving you a smaller production file while keeping your actual source readable.

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