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JavaScript Minifier
DeveloperMinify JavaScript code by removing whitespace, comments, and optimizing for production.
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JavaScript
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Quick answers for JavaScript Minifier
What does this minifier actually do?
It strips comments, collapses runs of whitespace, and removes unnecessary spacing around operators - the safe rewrites that don't change behaviour. It does NOT rename variables or perform tree-shaking; for production use, run terser or esbuild as part of your build.
Will it break my code?
It's designed not to. The minifier respects strings, template literals, and regex literals and never collapses whitespace inside them. Run your test suite after minifying anything you'll ship.
How much can I save?
Typical hand-written code shrinks 20–40% from comment and whitespace removal alone. The output panel shows the byte count before and after so you can see exactly how much was saved.
Why doesn't it rename variables?
Safe identifier renaming requires full scope analysis to avoid breaking closures, eval, and `with`. That's what tools like terser do - they're heavier but produce smaller output. This tool is for quick comment/whitespace stripping in the browser.
Is my code uploaded?
No. The JS Minifier runs entirely in your browser, so even proprietary or unreleased code stays on your machine.