HTML Optimizer

Professional HTML optimizer with minify and beautify modes. Compress, format, and optimize HTML with advanced whitespace control.

HTML Optimizer

Minify, beautify, and optimize your HTML code

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Free HTML Minifier and Beautifier Online

An HTML minifier reduces the file size of an HTML document by removing unnecessary characters: whitespace, comments, optional closing tags, and redundant attributes. The page renders identically in the browser, but the file is smaller, loads faster, and consumes less bandwidth.

This online HTML minifier uses a professional parser engine and can reduce HTML size by up to 70%, with a beautify mode to format messy or minified markup for readability.

How to minify HTML online

  1. Paste your HTML into the input area or upload an HTML file.
  2. Choose Minify or Beautify mode.
  3. Adjust advanced options for fine-grained control over what gets removed.
  4. Check the size statistics showing bytes saved and compression percentage.
  5. Copy the output or download the optimized file.

What HTML minification removes

  • Whitespace between tags: Spaces and line breaks between HTML elements that have no visual effect.
  • HTML comments: <!-- comments --> are only useful for developers and add bytes to every response.
  • Optional closing tags: Tags like </li>, </p>, and </td> are optional in HTML5.
  • Redundant attributes: Default values like type="text/javascript" on <script> tags are unnecessary in modern HTML.
  • Boolean attribute values: disabled="disabled" can be shortened to just disabled.

HTML minification and Core Web Vitals

Every byte saved in your HTML document speeds up the initial server response (TTFB) and parse time. Combined with CSS and JavaScript minification, HTML compression is part of a complete page performance strategy that improves LCP and FID scores. Static site generators like Next.js and Nuxt automatically minify HTML in production builds, but this tool is useful for manual HTML files, email templates, and legacy projects.

Common use cases

  • Email templates: Minify HTML emails before sending to reduce message size and improve deliverability.
  • Static HTML pages: Compress hand-coded landing pages before uploading to a CDN or FTP host.
  • Embedded HTML strings: Minify HTML before embedding it in JavaScript or server-side template strings.
  • Beautify generated output: Format minified HTML from build tools for debugging and code review.

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