What is HTML Minifier?

HTML Minifier is a free online or software-based tool designed to reduce the size of HTML files by removing unnecessary elements—such as whitespace, comments, and redundant code—without changing the website’s appearance or functionality.

The tool transforms human-readable HTML into a compact format optimized for production environments, directly impacting Core Web Vitals and SEO performance.

Core Features of HTML Minifier

Whitespace Elimination - Removes unnecessary spaces, tabs, and line breaks between HTML elements
Comment Removal - Strips out HTML comments that aren't needed in production code
Split-Panel Interface - Features dual panels showing original "HTML Input" and "Minified Output" side-by-side
Line Number Display - Provides numbered lines in both panels for easy code reference and navigation
Syntax Highlighting - Color-codes HTML elements, attributes, and text for improved readability
Real-Time Size Tracking - Displays file sizes in bytes (B) for both original and minified versions
Compression Percentage - Shows exact reduction percentage (e.g., "14.0% smaller") in the output panel
File Upload Support - Enables direct HTML file uploads via "Open HTML File" button

Example of a Minified Html Code

Input:

<!DOCTYPE html>
<html>
  <head>
    <!-- Page title -->
    <title>Example</title>
  </head>
  <body>
    <div class="card">
      <h1> Hello World </h1>
      <p>
        This is a sample page.
      </p>
    </div>
  </body>
</html>

Minified Output:

<!DOCTYPE html><html><head><title>Example</title></head><body><div class="card"><h1>Hello World</h1><p>This is a sample page.</p></div></body></html>

Why Use HTML Code Minifier?

Substantial File Size Reduction - Achieves typical compression rates of 13-20%, with the example showing 14.0% size reduction
Faster Page Load Times - Reduced HTML size leads to quicker initial page rendering and download speeds
Improved Core Web Vitals - Directly enhances Largest Contentful Paint (LCP) and First Input Delay (FID) metrics
Enhanced Mobile Performance - Particularly beneficial for mobile users with limited bandwidth or slower connections
Browser Parsing Speed - Compact HTML requires less time for browser parsing and rendering

How to Use

Paste or upload your HTML using the input editor or the Open HTML File... button.
The tool automatically minifies your HTML as you type or upload.
Copy the minified output or download it as minified.html.
Use Reset to clear both input and output.

Notes

This tool performs safe, client-side minification focused on comments and whitespace near tags. It avoids altering content inside script and style blocks. For advanced HTML optimization (attribute normalization, inline resource minification), consider build tools like html-minifier-terser in production.

HTML Minifier

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