Developer

HTML Minifier

Shrink HTML to its smallest safe form: comments stripped, whitespace collapsed, and blank lines removed — without touching the content of <pre>, <textarea>, <script>, or <style>.

ツール要約

このツールは構造化された入力を受け取り、サーバーへアップロードせずにブラウザで決定的な出力を返します。

ツール名: HTML Minifier
入力の目的: 変換・検証・分析するソースコンテンツを入力してください。
出力の目的: コピー・再利用・デバッグに適した正規化された出力を受け取ります。
入力例: <!DOCTYPE html> <html>  <body> <p> hello </p> </body> </html>
出力例: <!DOCTYPE html><html><body><p> hello </p></body></html>

Input HTMLDrop file

Options

Remove commentsStrip  blocks (keeps IE conditionals).Collapse whitespaceRemove extra spaces, tabs, and newlines.Preserve line breaksKeep one newline per line — easier to diff.Remove empty attributesDrop attributes like class="" or id="".

Original250 B

Minified176 B

Saved74 B

Reduction29.6%

Content of <pre>, <textarea>, <script>, and <style> is preserved verbatim.

Minified HTMLRead-only

<!DOCTYPE html><html lang="en"><head><meta charset="utf-8" /><title> Hello World </title></head><body><h1>Hello, world!</h1><p>This text has extra whitespace.</p></body></html>

ツールの紹介

Shrink HTML to its smallest safe form: comments stripped, whitespace collapsed, and blank lines removed — without touching the content of <pre>, <textarea>, <script>, or <style>.

ツール概要

A minifier reduces the bytes a browser has to download by removing characters that do not affect rendering. Comments, runs of whitespace, and newlines between tags are all safe to strip in most documents. This tool walks your HTML, sets aside the contents of preserved tags (<pre>, <textarea>, <script>, <style>) so they survive intact, then collapses whitespace in the rest. Toggle each option to match your stack — keep IE conditional comments, preserve line breaks for readable diffs, or drop empty class="" attributes. Everything runs locally in your browser; nothing is uploaded.

ユースケース

Trim bytes off email templates, transactional HTML, and AMP fragments before sending.
Pre-process server-rendered HTML for cache-friendly delivery on edge networks.
Strip developer comments and indentation from snippets before pasting into a CMS.

入力／出力の例

入力の目的

<!DOCTYPE html>
<html>
  <!-- a comment -->
  <body>
    <p>  hello  </p>
  </body>
</html>

出力の目的

<!DOCTYPE html><html><body><p> hello </p></body></html>

よくある質問

Will it break <pre> or <script> contents?+

No. The minifier sets those blocks aside before collapsing whitespace, then restores them verbatim, so indentation, code, and styles stay intact.

Does it remove IE conditional comments?+

No. Comments that start with <!--[if are kept so legacy IE conditional logic continues to work.

Is the output safe to deploy to production?+

For most templates, yes — the rules used are conservative. Always run a smoke test of the rendered page after a major minification change.

Is my HTML uploaded?+

No. Minification runs entirely in your browser; nothing leaves your device.

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