JavaScript Minifier
Minify JavaScript by stripping whitespace and comments
This minifier strips comments and unnecessary whitespace. For production builds with variable-name mangling and tree-shaking, use a parser-based tool like esbuild or Terser.
使い方
- 1Paste your JavaScript
Drop any JS - a single function, a whole file, or a snippet.
- 2Click minify
Comments, whitespace, and unnecessary line breaks are stripped instantly.
- 3Copy the result
Copy the minified output or see the size reduction.
JavaScript Minifier について
Free online JavaScript minifier. Strip comments, whitespace, and redundant semicolons from JS to reduce file size - typically 20-50% smaller. Handy for one-off pastes when you don't want to spin up a full build pipeline. Runs entirely in your browser. 712 Tools の JavaScript Minifier はモダンな JavaScript API を使って完全にブラウザ内で動作します - サーバーがあなたのデータを見ることは一切ありません。つまり、即時の結果、完全なプライバシー、アップロード制限なしです。
デバッグ、簡単な確認、あるいは本番のインシデント対応まで - このツールは何度でも無料で使えます。ウォーターマークなし、サインアップなし、ツール内広告なし。
よくある質問
How much smaller does the JS get?
Typically 20-50%. Comment-heavy or well-formatted files shrink more; already-minified code shrinks less.
Does it mangle variable names?
No. Only whitespace and comments are removed - variable names are preserved. For name mangling use a real bundler like esbuild or Terser.
Will it break my code?
It preserves the code's tokens. That said, minification via regex has edge cases with regex literals and template strings - for production code, use a proper parser-based tool.
Is my code uploaded?
No. Minification runs entirely in your browser.
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