JavaScript Minifier / Beautifier
Minify JavaScript to reduce file size, or beautify for readability.
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This tool minifies JavaScript (shortening variable names, removing whitespace and comments, to produce the smallest possible file for production) or beautifies it (restoring readable formatting from a minified/compressed file) - the JS equivalent of the CSS minifier/beautifier.
Frequently asked questions
Standard minification preserves the exact behavior of your code - it only compresses naming and whitespace. Code that relies on unusual, non-standard tricks around variable names or whitespace-sensitive parsing quirks (rare in practice) could theoretically behave differently, but this is uncommon for typical code.
Beautifying restores indentation and line breaks, making minified code far more readable - though original variable/function names are usually already shortened during minification and won't be restored to their original meaningful names.
Smaller files download and parse faster, which directly improves page load performance - especially important at scale across many visitors and slower network connections.