Techy AllTechy All
Get Free Quote

HTML Validator

Validate your HTML code against W3C standards to ensure cross-browser compatibility, accessibility, and best practices. Our tool checks for common errors and provides detailed feedback.

HTML Code Validator

HTML Input

Validation Results

Valid HTML Invalid HTML
Ready to Validate

Enter your HTML code and click the "Validate HTML" button to check for errors and warnings.

Why Validate Your HTML?

Cross-Browser Compatibility

Ensure your website works correctly across all modern browsers by fixing HTML errors that might cause rendering issues.

Accessibility

Improve website accessibility for users with disabilities by following HTML standards and best practices.

Performance

Valid HTML typically renders faster and more efficiently in browsers, improving overall page performance.

SEO Benefits

Search engines prefer well-structured, valid HTML, which can positively impact your search rankings.

How Our HTML Validator Works

Our HTML validator checks your code against the official W3C standards and identifies common issues that could affect your website's functionality and user experience.

What We Check For:

  • Syntax Errors - Missing tags, incorrect nesting, and malformed elements
  • Deprecated Elements - Outdated HTML tags that should be avoided
  • Accessibility Issues - Missing alt attributes, improper heading structure
  • Performance Problems - Unclosed tags, unnecessary elements
  • Best Practices - Proper document structure, semantic HTML usage

HTML Validator FAQ

An HTML validator ensures your code is properly structured, improving browser compatibility, performance, SEO, and accessibility for all users.

The HTML validator checks your code against official W3C standards, highlighting syntax errors, deprecated elements, accessibility issues, and performance problems.

The validator checks for syntax errors (missing tags, incorrect nesting), deprecated elements (outdated tags), accessibility issues (missing alt text, improper heading structure), and performance problems (unclosed tags).

It’s best to validate your HTML regularly throughout the development process. This ensures issues are caught early, improving code quality before deployment.

Using semantic HTML tags (like <header>, <footer>, and <article>) helps search engines understand your content’s structure, improving indexing and SEO rankings.

You can validate your HTML using online tools like the W3C Markup Validation Service, or integrate validation tools directly into your development environment.

Common issues include unclosed tags, improperly nested elements, missing alt text for images, outdated HTML elements, and missing document structure like <html> and <head>.

HTML validation ensures that accessibility best practices are followed, such as using semantic tags, proper heading structure, and providing alt text for images, making your website more accessible to users with disabilities.

HTML Validation Tips

Always Declare Doctype

Start your HTML documents with a proper DOCTYPE declaration to ensure standards mode.

Use Semantic Elements

Prefer semantic HTML5 elements like <header>, <nav>, and <main> over generic <div> elements.

Close All Tags

Ensure all HTML elements are properly closed, including self-closing tags with a trailing slash.

Validate Regularly

Run validation checks during development to catch issues early and maintain code quality.

Related Tools