JavaScript ミニファイア
Terser で JavaScript をオンライン圧縮：変数名短縮・デッドコード除去・削減率表示、すべてブラウザ内で
JavaScript Minifier Tips
- Powered by Terser - the same engine behind webpack, Vite and Rollup production builds.
- Mangling renames local variables to short names; disable it if you need readable stack traces.
- Dead code like unused functions is dropped automatically by the compressor.
- Minified ES modules still need a bundler for import/export resolution - minify bundles, not modules.
プロフェッショナルな JavaScript Minifier 処理機能
JavaScript Minifier データを効率的かつプロフェッショナルに扱うために必要なすべて
Terser Engine
The same battle-tested minifier that powers production builds of webpack and Vite.
Clean Output
Comments stripped, whitespace collapsed, code restructured for minimal size.
Dead Code Removal
Unused variables, unreachable branches and redundant logic disappear automatically.
Mangle Control
Toggle variable mangling with one checkbox - readable when you need it, tiny when you ship it.
Size Report
Bytes before and after, plus the exact percentage saved, on every run.
Private by Design
Your source code stays in the browser tab. Nothing is uploaded, ever.
仕組み
JavaScript Minifier をプロのように処理する簡単なステップ
Paste Your JavaScript
Copy a function, module bundle, or script into the input area.
Choose Options
Keep mangling on for smallest size, or turn it off for debuggable output.
Click Minify
Terser compresses the code in your browser and reports the savings.
Copy the Output
Copy the minified script into your build, CDN, or production page.
プロフェッショナルな JavaScript Minifier フォーマッター＆バリデーター
JavaScript Minifier processing runs entirely in your browser — no uploads, no accounts, no limits.
エキスパートによる構築
The JavaScript Minifier formatting engine runs locally in your browser using established parsers and standard algorithms. Nothing is hidden — open your browser dev tools and watch it work.
主な技術的特徴:
- • Real Terser engine (the standard for JS minification) running fully in your browser
- • Compressor removes dead code, unreachable branches and redundant logic
- • Optional mangling shortens variable and function names
- • Byte-accurate size report with before/after comparison and savings percentage
- • Engine loads lazily from CDN - the page stays fast until you click Minify
信頼とセキュリティ
Your data stays in your browser: nothing is uploaded, stored, or logged. Close the tab and it is gone.
セキュリティとプライバシー:
- • 100% client-side minification - your source code never leaves the browser
- • No tracking, cookies or data logging
- • HTTPS encryption for secure connections
- • Private or proprietary code stays on your device
- • GDPR and CCPA compliant approach
プロがEZ Formatterを選ぶ理由
Your data stays in your browser
よくある質問
Js Minifier フォーマットに関するよくある質問
Yes, completely free with no registration. All minification happens locally in your browser.
Terser - the industry-standard minifier used by webpack, Vite, Rollup and many other bundlers for their production builds.
Mangling renames local variables and functions to 1-2 character names for extra savings. Enable it for production; disable it when you need readable stack traces or debug the output.
It can compress the syntax, but module specifiers are left as-is. Bundle your code first (e.g. with a bundler), then minify the bundle for the best result.
Typical well-commented, readable source shrinks 40-60% with mangling enabled; already-compact code shrinks less. The size report shows the exact savings.