HTML Validator

Check your HTML code for errors and compliance

Validation Mode

HTML Version

HTML5 XHTML

Show Warnings

Paste your HTML code or enter a URL to begin validation

Always use proper HTML5 doctype declaration at the beginning of your document: <!DOCTYPE html>
Ensure all tags are properly closed
Use lowercase for all HTML elements and attributes
Always include alt attributes for images
Ensure proper nesting of HTML elements
Use semantic HTML elements like <header>, <nav>, <main>, <footer>
Validate your HTML regularly to ensure cross-browser compatibility