JavaScript Minifier
Minify JavaScript by removing comments, whitespace, and unnecessary characters.
JavaScript Bundle Size
JavaScript is the heaviest resource type on most web pages. Minification reduces JS file size by 20-50%, directly improving download time and parse time. For mobile users on slow connections, this difference is significant.
For production use, combine whitespace minification with tree-shaking (removing unused code) and code-splitting (loading only what is needed) for maximum performance. For quick snippets, this browser-side minifier is a fast way to compact code without setting up a build tool.
Related Tools
Frequently Asked Questions
What does this minifier remove?
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It removes single-line comments (//), multi-line comments (/* */), extra whitespace, and unnecessary newlines while preserving string contents and functionality.
Does it rename variables?
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No. This minifier only removes whitespace and comments. Full minification with variable renaming requires tools like Terser or UglifyJS.
Is the JavaScript sent to a server?
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No. The minifier runs in your browser, so pasted snippets and internal examples stay on your device.