Paste or upload messy HTML and get clean, well-indented code. It validates against HTML5, HTML4 or XHTML 1.0, and also runs accessibility and SEO checks, so you catch problems like missing alt text early. You can format and sort attributes, choose spaces or tabs, auto-close tags, remove comments, fix character encoding, or minify for production. Results come in clear tabs: validation, formatted code and stats. Copy the HTML, or download the code, a minified version or a report. No signup.