HTML CSS JSミニファイアー

ミニファイアーは、実行に不要なものをソースコードからすべて取り除きます。コメント・余分な空白・空白行・冗長な句読点です。ファイルが小さくなればページの読み込みが速くなり、帯域幅が減り、Core Web Vitalsが向上します。安全に行うのは見た目より難しいものです。JavaScriptの文字列リテラルの中の空白は意味を持ち、正規表現にはコメントに見える"/"と"//"が含まれ、HTMLの

内の空白は生き残らなくてはなりません。このツールは各言語をトークナイズし、証明可能な安全なものだけを削除します。
できること
1つのツールでHTML・CSS・JavaScriptをミニファイ
中に隠れた文字列に触れずコメントを削除
文字列・正規表現・テンプレート内容を保持しつつ空白を折りたたみ
HTML内の
/の内容を無傷で保持</li><li>前後のバイト数と削減率を表示</li><li>結果をコピーまたはダウンロード</li></ul><h3>使う場面</h3><ul><li>公開前にJSスニペット・CSSブロック・インラインHTMLを圧縮</li><li>少ないペイロードでパフォーマンス予算を通過</li><li>改行を拒否するフィールド用に1行出力を準備</li><li>埋め込みアセットのサイズを素早く削減</li></ul><p>プライバシー：ミニファイはすべてブラウザ内で行われ、貼り付けた内容がアップロードされることはありません。</p></div>
</section>
<section class="mt-14 max-w-3xl mx-auto card p-6 sm:p-8">
  <h2 class="text-xl font-semibold mb-4">安全なミニファイとリスクのあるテクニックの比較</h2>
  <div class="prose prose-slate dark:prose-invert max-w-none text-sm sm:text-base"><ul><li>コメント、インデント、改行が最初に削除されます — 通常、これは元のスクリプトサイズの約3分の1を占め、リスクは一切ありません。</li><li>ローカル変数の名前変更は、スコープ解析によって安全性が保証された場合のみ実行されます。グローバル変数やプロパティ名はそのまま保持されるため、外部APIが壊れることはありません。</li><li>gzip 圧縮後でも、ミニファイ済みソースは意味のあるレベルで小さく保たれます — これら2つの処理層は、異なる種類の冗長性をそれぞれ除去します。</li></ul></div>
</section>
<section class="mt-16 max-w-4xl mx-auto">
  <h2 class="text-2xl font-bold text-center">バイトが実際に配置される場所</h2>
  <div class="mt-6 grid gap-4 sm:grid-cols-3"><div class="feature-card">
      <div class="grid place-items-center h-11 w-11 rounded-xl bg-gradient-to-br from-indigo-500/10 to-fuchsia-500/10 text-2xl">⚡</div>
      <h3 class="font-semibold mt-1">3言語を1つのツールで</h3>
      <p class="text-sm text-slate-600 dark:text-slate-300 leading-relaxed">HTML・CSS・JSの圧縮がタブ付きの1ページにまとまっており、それぞれ専用のトークナイザー付き。単一目的のサイトを渡り歩く必要がありません。</p>
    </div>
<div class="feature-card">
      <div class="grid place-items-center h-11 w-11 rounded-xl bg-gradient-to-br from-indigo-500/10 to-fuchsia-500/10 text-2xl">🔒</div>
      <h3 class="font-semibold mt-1">文字列と正規表現は守られる</h3>
      <p class="text-sm text-slate-600 dark:text-slate-300 leading-relaxed">トークナイザーが引用文字列・テンプレートリテラル・正規表現リテラルを理解するので、圧縮は"a/ b/c"や、その中にあるコメントに見えるテキストを壊しません。</p>
    </div>
<div class="feature-card">
      <div class="grid place-items-center h-11 w-11 rounded-xl bg-gradient-to-br from-indigo-500/10 to-fuchsia-500/10 text-2xl">🎯</div>
      <h3 class="font-semibold mt-1">削減量を測定</h3>
      <p class="text-sm text-slate-600 dark:text-slate-300 leading-relaxed">ステータスバーが前後のバイト数と削減率を報告するので、各圧縮がどれだけペイロードを減らすか正確に分かります。</p>
    </div></div>
</section>
<section class="mt-14 max-w-3xl mx-auto">
  <h2 class="text-xl font-semibold mb-4">よくある質問</h2>
  <div class="space-y-3"><details class="faq-item">
      <summary class="font-medium cursor-pointer list-none flex justify-between items-center gap-3">JavaScriptに対して安全ですか？<span class="text-slate-400 group-open:rotate-180 transition shrink-0">⌄</span></summary>
      <p class="mt-3 text-slate-600 dark:text-slate-300 leading-relaxed">はい。JSミニファイアーはまずトークナイズし、コメントと正規表現リテラル・文字列を区別します。"/…/"パターンと文字列内の"//"テキストはバイト単位で保持され、本物のコメントと装飾的な空白だけが削除されます。</p>
    </details>
<details class="faq-item">
      <summary class="font-medium cursor-pointer list-none flex justify-between items-center gap-3">HTMLの空白は？<span class="text-slate-400 group-open:rotate-180 transition shrink-0">⌄</span></summary>
      <p class="mt-3 text-slate-600 dark:text-slate-300 leading-relaxed">タグ間の空白は折りたたまれますが、<pre>と<textarea>内の内容は意味がある可能性があるため保持され、文字列属性もそのまま残ります。出力は同一レンダリングの有効なHTMLのままです。</p>
    </details>
<details class="faq-item">
      <summary class="font-medium cursor-pointer list-none flex justify-between items-center gap-3">ビルドパイプラインの代わりになりますか？<span class="text-slate-400 group-open:rotate-180 transition shrink-0">⌄</span></summary>
      <p class="mt-3 text-slate-600 dark:text-slate-300 leading-relaxed">単発のタスクにはなります。プロジェクト全体ではCIでesbuild/terser/CSSNanoを使うでしょうが、このツールはスニペット・メールテンプレート・単一アセットを最小の形にするのに理想的です。</p>
    </details></div>
</section>
<section class="mt-14 max-w-3xl mx-auto">
  <h2 class="text-xl font-semibold mb-4">関連ツール</h2>
  <div class="grid gap-3 sm:grid-cols-2"><a href="/ja/tools/html-beautifier" class="feature-card card-hover flex-row items-center gap-3">
      <span class="grid place-items-center h-10 w-10 rounded-xl bg-gradient-to-br from-indigo-500/10 to-fuchsia-500/10 text-xl shrink-0">🌐</span>
      <span class="font-medium text-sm">HTMLビューティファイアー</span>
    </a>
<a href="/ja/tools/css-beautifier" class="feature-card card-hover flex-row items-center gap-3">
      <span class="grid place-items-center h-10 w-10 rounded-xl bg-gradient-to-br from-indigo-500/10 to-fuchsia-500/10 text-xl shrink-0">🎨</span>
      <span class="font-medium text-sm">CSSビューティファイアー</span>
    </a>
<a href="/ja/tools/js-beautifier" class="feature-card card-hover flex-row items-center gap-3">
      <span class="grid place-items-center h-10 w-10 rounded-xl bg-gradient-to-br from-indigo-500/10 to-fuchsia-500/10 text-xl shrink-0">🟨</span>
      <span class="font-medium text-sm">JSビューティファイアー</span>
    </a>
<a href="/ja/tools/sql-formatter" class="feature-card card-hover flex-row items-center gap-3">
      <span class="grid place-items-center h-10 w-10 rounded-xl bg-gradient-to-br from-indigo-500/10 to-fuchsia-500/10 text-xl shrink-0">🗄️</span>
      <span class="font-medium text-sm">SQLフォーマッター</span>
    </a></div>
</section>

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        <span class="badge-free">無料</span>
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        <span class="badge-free">無料</span>
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      el.appendChild(text);
      el.appendChild(bar);
      root.appendChild(el);
      // The bar's own 3s CSS animation is the visual countdown; this timeout
      // (same 3000ms) is what actually removes the toast once it empties.
      setTimeout(function () {
        el.classList.add('leaving');
        setTimeout(function () { el.remove(); }, 250);
      }, 3000);
    };
  </script>
  <script>
    // Swap the login link for "My account" when the login-hint cookie is set.
    (function () {
      if (/(?:^|;\s*)li=1/.test(document.cookie)) {
        var a = document.getElementById('nav-auth');
        a.href = a.dataset.accountHref;
        a.textContent = a.dataset.accountLabel;
      }
    })();
  </script>
  <script>
    // Header membership CTA: anonymous/free users see "⚡ Upgrade" -> /pricing
    // (the prominent entry point, not just the footer link). Signed-in Pro/Max
    // members see a calm plan badge -> /account instead of a repeated upsell.
    (function () {
      if (!/(?:^|;\s*)li=1/.test(document.cookie)) return;
      var a = document.getElementById('nav-upgrade');
      if (!a) return;
      fetch('/api/credits').then(function (r) { return r.json(); }).then(function (b) {
        if (!b || !b.ok || (b.data.plan !== 'pro' && b.data.plan !== 'max')) return;
        a.href = a.dataset.accountHref;
        a.classList.add('member');
        var label = document.getElementById('nav-upgrade-label');
        if (label) label.textContent = b.data.plan.toUpperCase();
        a.setAttribute('aria-label', b.data.plan.toUpperCase());
      }).catch(function () {});
    })();
  </script>
  <script>
    // Record visit for the home page "recently used" row (local only).
    try {
      var _id = "minifier";
      var _r = JSON.parse(localStorage.getItem('recent_tools') || '[]').filter(function (x) { return x !== _id; });
      _r.unshift(_id);
      localStorage.setItem('recent_tools', JSON.stringify(_r.slice(0, 8)));
    } catch (e) {}
  </script>
  <script>
    // Announcement bar — fetches latest banner, renders inline. Ephemeral content,
    // not SEO-critical; the /announcements page IS full SSR for indexing.
    (function(){
      var bar=document.getElementById('announcement-bar');
      var link=document.getElementById('announcement-bar-link');
      var closeBtn=document.getElementById('announcement-bar-close');
      if(!bar||!link)return;
      var locale="ja";
      fetch('/api/announcements/latest?lang='+encodeURIComponent(locale))
        .then(function(r){return r.json()})
        .then(function(b){
          if(!b.ok||!b.data||!b.data.banner)return;
          var ann=b.data.banner;
          try{if(sessionStorage.getItem('ab_'+ann.id)==='1')return}catch(e){}
          link.textContent=ann.title;
          if(ann.slug)link.href='/'+locale+'/announcements/'+ann.slug;
          bar.classList.remove('hidden')
        }).catch(function(){});
      closeBtn.addEventListener('click',function(){
        bar.classList.add('hidden');
        try{sessionStorage.setItem('ab_'+link.href.split('/').pop(),'1')}catch(e){}
      })
    })();
    // First-visit popup — lazy-shown 4s after load, localStorage-dismissed forever.
    (function(){
      if(false)return; // game pages: no popup over gameplay
      var locale="ja";
      fetch('/api/announcements/latest?lang='+encodeURIComponent(locale))
        .then(function(r){return r.json()})
        .then(function(b){
          if(!b.ok||!b.data||!b.data.popups||!b.data.popups.length)return;
          var popup=b.data.popups[0];
          try{if(localStorage.getItem('ap_'+popup.id)==='1')return}catch(e){}
          setTimeout(function(){showPopup(popup)},4000)
        }).catch(function(){});
      function showPopup(p){
        var o=document.createElement('div');
        o.className='fixed inset-0 bg-black/50 z-[9998] flex items-center justify-center p-4';
        o.style.animation='fadeIn .25s ease';
        var slug = p.slug||'';
        var detailUrl = slug ? '/'+locale+'/announcements/'+slug : '';
        o.innerHTML='<div class="bg-white dark:bg-slate-900 rounded-2xl shadow-2xl max-w-md w-full p-6 sm:p-8 relative" style="animation:scaleIn .25s ease">'+
          '<button id="apx" class="absolute top-3 right-3 text-slate-400 hover:text-slate-600 dark:hover:text-slate-200 text-xl leading-none">×</button>'+
          '<div class="text-3xl mb-3">📢</div>'+
          '<h2 class="text-lg font-bold mb-2"></h2>'+
          '<p class="text-sm text-slate-600 dark:text-slate-300 mb-5 leading-relaxed"></p>'+
          '<div class="flex gap-2">'+
          '<button id="apd" class="btn-primary text-sm flex-1">Got it</button>'+
          (detailUrl ? '<a href="'+detailUrl+'" class="btn-ghost text-sm flex-1 text-center">Read more →</a>' : '')+
          '</div></div>';
        document.body.appendChild(o);
        o.querySelector('h2').textContent=p.title;
        o.querySelector('p').textContent=p.content.length>200?p.content.slice(0,200)+'…':p.content;
        function close(){o.remove();try{localStorage.setItem('ap_'+p.id,'1')}catch(e){}}
        o.querySelector('#apx').addEventListener('click',close);
        o.querySelector('#apd').addEventListener('click',close);
        o.addEventListener('click',function(e){if(e.target===o)close()})
      }
    })();
  </script>
</body>
</html>