JavaScript Minifier & Beautifier
Compress JavaScript with Terser or make minified code readable again — 100% in your browser
What does JavaScript minification do?
JavaScript minification rewrites your code so it behaves exactly the same but takes up far fewer bytes. This tool uses Terser, the same minifier used by webpack, Vite and Next.js in production builds. It removes whitespace and comments, shortens ("mangles") local variable names to one or two characters, and applies compression transforms such as dead-code elimination, constant folding and expression simplification.
Typical savings are 30–60% of the original file size. For example, jQuery 3.7 shrinks from about 285 KB of readable source to about 87 KB minified — roughly a 70% reduction. Minification stacks with gzip or Brotli compression on your server: minified plus gzipped JavaScript is commonly 80–90% smaller than the raw source, which directly improves page load time and Core Web Vitals.
Beautify mode does the reverse: it re-indents and reformats compressed or single-line JavaScript so it is readable again. It cannot restore mangled variable names — those are gone for good once minified — but it makes the code structure easy to follow when you are debugging a production bundle.
❓JavaScript Minifier FAQ
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