This minifier performs the safe half of JavaScript compression: it strips comments, blank lines and unnecessary whitespace without renaming variables or restructuring code. That conservative approach matters, because aggressive mangling can break scripts that rely on function names, string-based lookups or reflection — a category of bug that only shows up in production. Expect 15-30% smaller files, which reduces both transfer size and the parse work the browser does on the main thread before your script can run. For a full build pipeline you would reach for esbuild or Terser; for a single script, a widget or a snippet with no build step, this does the job in one paste.
Free, fast, and runs entirely in your browser — no signup, no upload to a server.