Htmlrunner HTML Cleanup
Paste any messy, broken, or unstructured HTML and get back clean, well-indented, production-ready code — unused tags removed, broken elements fixed, instantly.
What Does It Actually Fix?
HTML Cleanup handles every common issue that causes rendering problems, accessibility failures, and validation errors.
Empty Tag Removal
Strips out meaningless empty <div></div>, <span></span> and other void elements that bloat your markup.
Structure & Indentation
Properly indents every nesting level with 2-space tabs, so your HTML is readable and maintainable the moment it comes back to you.
Attribute Cleanup
Trims empty attribute values like id="" and class=" ", and optionally removes all inline event handlers like onclick.
Tag Case Normalisation
Converts tags like <DIV> or <H1> to lowercase HTML5 standards, ensuring cross-browser compatibility and valid markup.
Comment Stripping
Optionally removes all <!-- --> HTML comments from production-bound code, keeping your output lean and clean.
Instant & Private
All processing happens entirely in your browser using JavaScript — no data is ever sent to a server. Safe for proprietary code, confidential projects, and enterprise use.
Expert FAQ
Why HTML Cleanup Matters for Your Website
Real-world HTML is messy. It comes from CMS exports, email builders, legacy code, copy-paste from Word, or third-party integrations — and it almost always contains redundant markup, mismatched tags, empty elements, and inline styles that fight with your stylesheet. HTML cleanup is the process of removing all that noise and returning code that browsers, screen readers, and search engine crawlers can parse cleanly and quickly.
How Clean HTML Improves Performance and SEO
Search engines crawl your HTML to understand your page. Bloated markup with nested empty divs, broken tags, and duplicated attributes forces the crawler to do unnecessary work, which can hurt your crawl budget and, by extension, your rankings. Clean, semantic HTML also loads faster — fewer bytes for the browser to parse before it can begin rendering, which directly improves your Largest Contentful Paint (LCP) and First Contentful Paint (FCP) scores.
Accessibility Benefits of Structured HTML
Screen readers and assistive technologies navigate your page using its HTML structure. Unclosed tags, out-of-order headings, and mismatched nesting confuse these tools and create barriers for users with disabilities. Running your markup through an HTML cleanup tool before publishing ensures that your structural semantics are correct — making your site more inclusive and more compliant with WCAG accessibility guidelines.
How to Use This Free HTML Cleanup Tool
Using HTML Runner's cleanup tool is simple:
- Paste your raw or messy HTML into the input box above.
- Choose your cleanup options — remove empty tags, strip comments, remove inline events.
- Click Clean HTML and get your structured, indented output instantly.
- Copy the result and drop it straight into your project.
No account, no upload, no server. Everything runs locally in your browser for complete privacy.