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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Content of pre, textarea, script and style is never touched. Whitespace between two inline elements is kept as a single space because it renders.

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 runs entirely in your browser, keeps the single space between inline elements that actually renders, and can reduce HTML size by up to 70%. A beautify mode formats 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.

Frequently Asked Questions

Is it safe to minify HTML, will the page still look the same?

Yes, if the minifier knows which whitespace renders. Space between block elements such as div, p or li has no visual effect and is removed, while a space between two inline elements like a, span or b would collapse two words together, so this tool keeps it as a single space. The content of pre, textarea, script and style is never modified.

What does Remove optional end tags do?

HTML5 lets you omit closing tags such as </li>, </td>, </tr>, </option> and, before a block element, </p>. Browsers close them automatically, so removing them saves bytes without changing the page. It is off by default because some template engines and XML tools expect the closing tags to be present.

How much smaller does the HTML get?

It depends on how much indentation and how many comments the source contains. Hand-written or template-generated pages with deep indentation typically shrink by 20 to 40 percent, and pages with large commented sections can lose up to 70 percent. The statistics box shows the exact bytes saved and the percentage.

Are conditional comments and PHP tags preserved?

Conditional comments for old Internet Explorer, the ones starting with <!--[if, are kept even when Remove HTML comments is on. In beautify mode, PHP tags and ASP style tags are protected and re-inserted verbatim after formatting, so a template file keeps working.

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