JavaScript Minifier / Beautifier

How to Use the JavaScript Minifier / Beautifier

This free online JavaScript tool lets you minify or beautify your JS code instantly in your browser. Select "Minify" to compress your code by removing comments, whitespace, and unnecessary characters. Select "Beautify" to format compressed JavaScript with proper indentation and line breaks.

JavaScript Minification

• Removes single-line comments (// ...) and multi-line comments (/* ... */)
• Collapses unnecessary whitespace and empty lines
• Removes spaces around operators and punctuation
• Displays character count comparison and size savings
• Preserves string literals to prevent breaking your code

JavaScript Beautification

The beautify mode transforms minified JavaScript into readable, well-formatted code. It adds line breaks after semicolons and braces, applies consistent indentation based on code block depth, and respects string literals. This is perfect for reading and debugging minified code from production sources.

When to Minify JavaScript

JavaScript minification is a standard practice for production deployments. Minified JS files are smaller and load faster, improving page performance and Core Web Vitals scores. Most build tools (Webpack, Vite, esbuild) automatically minify JS, but this tool is handy for quick one-off minification, testing, or when you need to minify standalone scripts.

JavaScript Minifier / Beautifierの使い方

このツールはJavaScriptコードの圧縮(ミニファイ)と整形(ビューティファイ)をブラウザ上で実行します。圧縮モードではコメントや不要な空白を削除してファイルサイズを削減し、整形モードでは圧縮されたコードを読みやすいフォーマットに変換します。すべての処理はクライアントサイドで行われます。