CSS ミニファイア
CSSO で CSS をオンライン圧縮：ルール統合・オーバーライド除去・スタイルシート再構築、ブラウザ内で完結
CSS Minifier Tips
- Powered by CSSO - a structural optimizer that merges and restructures rules, not just a whitespace stripper.
- Overridden declarations are removed automatically: later rules win, earlier duplicates disappear.
- margin: 0px becomes margin: 0 and colors like #ff0000 become red where shorter.
- Load the sample to see rule merging in action - overridden properties simply vanish.
プロフェッショナルな CSS Minifier 処理機能
CSS 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
CSSO Engine
A structural CSS optimizer that understands the cascade, not just a whitespace stripper.
Clean Output
Comments stripped, whitespace collapsed, declarations folded to shortest form.
Rule Merging
Duplicate and overridden declarations disappear while the cascade stays intact.
Safe Optimization
Declarations are only removed when a later rule guarantees to override them.
Size Report
Bytes before and after, plus the exact percentage saved, on every run.
Private by Design
Your styles stay in the browser tab. Nothing is uploaded, ever.
仕組み
CSS Minifier をプロのように処理する簡単なステップ
Paste Your CSS
Copy a stylesheet, a component style block, or compiled CSS into the input area.
Click Minify
CSSO restructures the rules in your browser - merging, folding and stripping.
Check the Report
See the byte count before and after, plus the percentage saved.
Copy the Output
Copy the minified CSS into your build, CDN, or production page.
プロフェッショナルな CSS Minifier フォーマッター＆バリデーター
CSS 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 CSS 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 CSSO engine running fully in your browser
- • Structural optimization merges rules and removes overridden declarations
- • Shorthand folding and shorter equivalent values (colors, units, zeros)
- • 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 styles never leave the browser
- • No tracking, cookies or data logging
- • HTTPS encryption for secure connections
- • Design tokens and client CSS stay 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
Css 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.
CSSO (CSS Optimizer) - a structural optimizer from the Yandex/Ozon ecosystem that merges selectors, folds shorthands and removes overridden declarations, going well beyond simple whitespace removal.
No. CSSO preserves the cascade: declarations removed are ones guaranteed to be overridden later, so the rendered result is identical.
No - those need to be compiled to CSS first. Feed the compiled .css output here for the final size squeeze.
Readable, well-indented CSS typically shrinks 40-70% thanks to whitespace removal plus CSSO restructuring. The size report shows the exact savings.