Free OnlineDeveloper Tools
JavaScript Minifier
Minify JavaScript code to reduce file size. Remove whitespace, shorten variables, and optimize for production use.
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Key Features — JavaScript Minifier
Removes whitespace and comments
Shortens local variable names
Removes dead code and unused variables
Shows compression ratio statistics
Preserves important comments with /*! */ syntax
Why Use This Tool — JavaScript Minifier
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Works Everywhere
Use on any device — desktop, tablet, or phone. No downloads or plugins needed.
Frequently Asked Questions — JavaScript Minifier
How much smaller will my JavaScript file be?
Minification typically reduces JavaScript file size by 30% to 60% depending on coding style, comment density, and variable name lengths. Combined with gzip compression on the server, total transfer savings can exceed 80%.
Will my code still work after minification?
Yes. The minifier only removes characters and renames variables in ways that do not change the code behavior. The minified version is functionally identical to the original. Always test your minified code to confirm expected behavior.
How do I preserve license comments?
Wrap important comments like license notices in /*! */ instead of /* */. The exclamation mark tells the minifier to keep that comment in the output. This is a widely supported convention used by all major minification tools.