HTML Validation & Accessibility
Validate your HTML code against W3C standards to identify syntax errors, accessibility issues, and deprecated elements for better SEO and cross-browser compatibility
Why Validate HTML & Accessibility?
Valid HTML and WCAG compliance are the foundation of a professional web. Our tool checks for syntax errors that break parsers and accessibility issues that block screen readers—all in one pass
🔍 What We Check
- Syntax errors (unclosed tags, malformed attributes)
- Missing required attributes (alt, lang, meta charset)
- Deprecated HTML elements (<font>, <center>)
- WCAG contrast issues (text vs background)
- Missing ARIA labels for interactive elements
- Improper heading hierarchy (skipped levels)
✨ Benefits of Valid Markup
- Better SEO: Search engines rank clean HTML higher
- Faster parsing: Browsers render valid code more efficiently
- Accessibility: Screen readers rely on proper structure
- Future-proof: Standards-compliant code ages better
💡 Pro Tip
Accessible HTML is also SEO-friendly HTML. Fixing contrast issues and missing ARIA labels improves your site for both users and search engines
Frequently Asked Questions
What is an HTML validator?
An HTML validator is a tool that checks your HTML code for syntax errors, W3C compliance issues, and accessibility problems. It ensures your website follows web standards and works correctly across all browsers
Why should I validate my HTML?
Validating HTML improves SEO rankings, ensures faster page loading, enhances accessibility for screen readers, and prevents cross-browser compatibility issues. Search engines like Google prioritize clean, valid markup
What HTML errors does this tool check for?
Our validator checks for: unclosed tags, malformed attributes, missing alt text on images, deprecated elements (font, center), WCAG contrast violations, missing ARIA labels, and improper heading hierarchy
How often should I validate my HTML?
Validate HTML after every major code change, before production deployments, and at least monthly for active websites. Automated CI/CD integration can validate on every commit