What does JavaScript minification do?

JS minification removes comments, extra whitespace, and newlines from JavaScript code to reduce file size. Smaller JS files load faster, improving page performance and user experience.

Is this JS minifier safe to use on production code?

This tool performs basic minification — removing comments and collapsing whitespace. It's suitable for simple scripts. For complex production code with advanced optimizations (variable renaming, tree-shaking), consider tools like Terser or esbuild.

Will minification break my JavaScript code?

Basic whitespace and comment removal should not break well-written JavaScript. However, code that relies on automatic semicolon insertion or has syntax issues may behave differently. Always test minified code before deployment.

What's the difference between minify and beautify?

Minify compresses code by removing unnecessary characters to reduce file size. Beautify (format) does the opposite — it adds proper indentation and newlines to make code human-readable. Both are useful at different stages of development.

Is my JavaScript code sent to a server?

No. All processing happens entirely in your browser using JavaScript. Your code is never uploaded to any server, ensuring complete privacy and security.

JavaScript 圧縮ツール

JavaScriptコードをオンラインで圧縮・整形。コメントや空白を削除してJSファイルサイズを即座に削減。

入力

使い方

JavaScriptコードをオンラインで圧縮・整形。コメントや空白を削除してJSファイルサイズを即座に削減。

1Paste your JavaScript code into the input field.
2Click 'Minify' to compress or 'Format' to beautify the code.
3View the size comparison showing bytes saved.
4Copy the output to use in your project.

主な機能

Remove comments and collapse whitespace instantly
Beautify minified code for readability
Shows byte size savings with percentage
100% browser-based — code never leaves your device

JavaScript 圧縮ツール

使い方

主な機能

よくある質問