Validate your HTML markup to ensure it follows web standards and provides a consistent experience across all browsers. Detect unclosed tags, nesting errors, and missing attributes instantly with detailed diagnostic feedback.
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Tip
Include the lang attribute in your <html> tag to help screen readers and search engines identify page language.
Did You Know?
HTML5 introduced semantic tags like <main> and <section> to help machines understand your content structure.
<div> or <ul> which often breaks the entire page layout<div> inside an inline element like a <span><title> tag in the headerBest Practice
Always close your tags in the reverse order they were opened to maintain a valid and predictable DOM tree.
<header>, <main>, and <footer> for better structural validationQ: Why is HTML validation important? A: It ensures your site is compliant with W3C standards, which improves browser compatibility, SEO, and user experience.
Q: Does this validator check for accessibility? A: It identifies structural issues that impact accessibility, though specialized WCAG tools should be used for full compliance audits.
Q: Can I validate partial HTML snippets? A: Yes, the tool can check both full documents and small code fragments for basic syntax errors and tag closure.