Does this formatter preserve script and preformatted code tags?

Yes. When minifying or formatting, contents inside , , and tags are preserved verbatim without altering existing line breaks or indentation.

Does HTML minification improve website performance and SEO?

Yes. Minifying HTML eliminates redundant whitespace, carriage returns, and developer comments, reducing initial Time to First Byte (TTFB), payload download times, and Core Web Vitals latency.

Is my HTML uploaded to a server for formatting?

Never. All parsing, indentation logic, and minification execute 100% locally in your web browser. No markup or private document content is ever sent to any remote server.

Developer Tools Suite

HTML & XML Formatter, Beautifier & Minifier

Format, beautify, inspect, and compress HTML5 and XML markup with customizable indentations and tag hierarchy preservation. 100% private in-browser tool.

Indent:

Keep Comments

Raw HTML / XML Input

853 bytes18 tags detected

Processed Markup Output

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- Primary Page Metadata -->
    <title>
      KitWharf Utility Tools
    </title>
    <link rel="stylesheet" href="/styles.css">
  </head>
  <body>
    <header class="navbar">
      <div class="container">
        <h1>
          Fast &amp; Private Web Apps
        </h1>
        <nav>
          <a href="/tools">
            All Tools
          </a>
          <a href="/about">
            About
          </a>
        </nav>
      </div>
    </header>
    <main>
      <!-- Dynamic Tool Card -->
      <article class="card">
        <h2>
          HTML Formatter
        </h2>
        <p>
          Clean, beautify or compress your markup instantly.
        </p>
        <img src="/logo.png" alt="KitWharf Logo" width="200" height="50">
      </article>
    </main>
  </body>
</html>

Output: 935 bytesFormatted view

HTML5 Void (Self-Closing) Elements Specification

In HTML5, void elements cannot contain content and should never have closing tags like </img> or </input>:

Void Tag	Standard Purpose	Valid HTML5 Syntax	Trailing Slash Rule
<img>	Embedded raster or vector graphics	<img src="pic.jpg" alt="...">	Optional (<img /> valid)
<input>	Interactive form field controls	<input type="text" name="q">	Optional
<meta>	Document level metadata & viewport	<meta charset="UTF-8">	Optional
<link>	External CSS sheets & canonicals	<link rel="canonical" href="...">	Optional
<br> / <hr>	Line break / thematic horizontal rule	<br> or <hr>	Optional

HTML Minification Performance & Core Web Vitals Impact

Optimization Aspect	Unminified Document	Minified Document	Metric Improvement
Payload File Size	Contains indentation spaces & comments	15% – 35% smaller footprint	Faster network transmission
DOM Tree Parse Speed	Parser creates text nodes for whitespace	Fewer extraneous text nodes	Quicker DOMContentLoaded
Gzip / Brotli Synergy	Repeated whitespace compresses moderately	Maximum compression entropy	Lowest over-the-wire byte transfer

How to Format and Minify HTML Markup

Paste HTML or XML: Paste unformatted code into the left editor.
Select Mode & Indentation: Click "Beautify HTML" for 2-space/4-space indented code, or "Minify HTML" for single-line production output.
Copy or Download: Use 1-click "Copy" or download the clean markup as a `.html` file.

Frequently Asked Questions

100% In-Browser Privacy

All HTML parsing, indentation, and minification execute entirely client-side inside your browser. No documents or sensitive markup are ever uploaded.

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