Web Hosting & Dev
W3C Markup Validator
Check your website's HTML for errors.
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- Added
- Nov 2, 2026
- Source
- validator.w3.org
The W3C validator reads your HTML and lists any mistakes, like tags that aren't closed or attributes in the wrong place. Clean HTML is less likely to break in some browsers.
What you can do with it
- Check a page by URL, upload or pasted code
- Find unclosed tags and invalid attributes
- Learn proper HTML as you fix errors
Good to know
Not every warning needs fixing. Focus on real errors first.