JS Minifier

Minification removes unnecessary characters (whitespace, comments, semicolons) without changing the code logic, making it smaller but still readable if reformatted. Obfuscation deliberately makes code hard to understand by renaming variables, rearranging logic, and adding dead code. This tool performs minification only.

Minifying JavaScript reduces file size, which means faster downloads and page loads for your users. Smaller files also reduce bandwidth costs and improve Core Web Vitals scores like Largest Contentful Paint. Most production websites serve minified JavaScript.

Proper minification should never break code. This tool removes only whitespace and comments while preserving string literals, regular expressions, and all code logic. However, if your code relies on Function.toString() or similar reflection, the output may differ from the original formatting.

Source maps are files that map minified code back to the original source. When you debug in browser dev tools, source maps let you see and set breakpoints in the original, readable code. Build tools like Webpack and Vite generate source maps automatically during the build process.

For production projects, build tools like Webpack, Rollup, esbuild, or Vite provide minification as part of the build pipeline along with tree shaking, code splitting, and bundling. This online tool is useful for quick one-off minification, testing, or when you need to compress a standalone script without a build setup.