HTML Makr

HTML Validator

Comprehensive

Validate HTML structure, check accessibility (WCAG), SEO best practices, and performance. Get detailed, actionable feedback.

HTML Input

Paste your HTML code to validate

What We Check

HTML Structure

  • DOCTYPE declaration
  • Required elements
  • Deprecated tags
  • Tag nesting

Accessibility

  • Image alt attributes
  • Form labels
  • Heading hierarchy
  • Language attributes

SEO

  • Title tag
  • Meta description
  • Title length
  • Content quality

Performance

  • Viewport meta tag
  • Inline styles
  • Code optimization
  • Best practices