Code Minifier

Names Shorten local names Keep all names Names inside functions become one or two letters. Top-level names stay in Script mode. Optimisation Compress (remove dead code, simplify) Whitespace and comments only Code type Script ES module (import, export) Module mode also shortens and removes unused top-level names. Console calls Keep Remove console.log, console.warn and similar debugging output. Rule merging Keep rule order Merge and move rules Merging saves more by combining identical rules and declarations. CSSO only does it where it judges the result the same; test the page afterwards. Whitespace Keep one space Collapse fully Full collapse can remove a visible space between inline elements such as links and bold text. Inline CSS and JavaScript Minify Leave as written CSS goes through CSSO and JavaScript through Terser. A block either cannot read is left as written. Attributes Remove redundant ones Keep all For example type=”text/javascript”, and checked=”checked” becomes checked.