CSS HTML Validator - The fast, all-in-one, HTML, CSS, Link, SEO, spelling, and accessibility checker for Windows, & htmlval for Mac and Linux
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Fix & Repair HTML and XHTML with CSS HTML Validator

Use CSS HTML Validator Home, Pro, or Enterprise to check for and fix problems with HTML, XHTML, CSS, PHP, JavaScript, and other types of documents.

Use the Pretty Print & Fix tool to automatically fix certain types of problems.

CSS HTML Validator for Windows can help you repair and fix HTML and XHTML, both manually and automatically. Use the Pretty Print & Fix tool to automatically fix certain problems in HTML and XHTML documents.

In addition, CSS HTML Validator checks and helps you fix HTML, CSS, accessibility, spelling, links, and more.

NOTE: Not all problems can be automatically fixed. For more information, please visit the Pretty Print & Fix documentation page.

CSS HTML Validator is easy to use. Simply open a document (a local file or via HTTP/HTTPS), press F6, and the document is checked. It's that simple!

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Screenshot of the Pretty Print & Fix Tool

Use the Pretty Print & Fix Tool to automatically format and fix certain HTML problems, convert HTML to XHTML, and reformat/pretty print HTML and XHTML documents.

screenshot of CSS HTML Validator highlighting an error

CSS HTML Validator integrates a powerful, lightweight, clean HTML/text editor with a powerful custom validation engine that produces intelligent, thorough, and understandable results.

Notice that the line in the document with the validator message is highlighted in red to indicate an error occurred on the line. Notice also that the message in the Results Window (at the bottom) has been selected causing the text responsible for the message to be selected.