JavaScript Minifier
Minify JavaScript — remove whitespace, comments, and shorten code for production.
About JavaScript Minifier
JavaScript minification removes unnecessary whitespace, comments, and newlines from source files, significantly reducing file size. For production builds, use a proper bundler/minifier (Terser, esbuild, webpack) that also performs tree-shaking (removing unused code), dead code elimination, and variable name mangling — techniques that this basic minifier does not perform. This tool is useful for quick manual minification of small scripts.
FAQ
How much can minification reduce file size?
Whitespace/comment removal typically reduces size by 20-40%. Advanced minifiers using variable name mangling and dead code elimination can achieve 60-80% reduction. Combined with gzip compression (which servers apply automatically), total transfer size reduction is often 85-90% vs the original source. For React apps, the production build (npm run build) handles all of this automatically.