Ensure your web pages are error-free and compliant with modern standards using our HTML Validator. This tool identifies broken tags, nesting issues, and accessibility gaps with real-time feedback and precise error highlighting.
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Tip
Use the lang attribute on your <html> tag to help search engines and screen readers identify the page language.
Did You Know?
Valid HTML is a key component of technical SEO and helps search engines index your site content correctly.
</div> or accidentally closing a <span> with a </div> tag.<div> or <h1> inside inline elements like <a> or <span>.alt tag for images or src for script tags.Best Practice
Always include a descriptive alt attribute for <img> tags to ensure your site is accessible to visually impaired users.
<main>, <article>, and <nav> over generic <div> tags for better structure.Q: Does this tool check for CSS or JavaScript errors? A: This tool is specifically designed for HTML structure. For other languages, please use our CSS Validator or TypeScript/JavaScript tools.
Q: Why does my valid HTML look broken in some browsers? A: Validation ensures syntax is correct, but CSS styling and browser engine differences can still affect visual rendering.
Q: Does this validator support HTML5 elements? A: Yes, it fully supports the latest HTML5 standards including semantic tags and modern input types.
Q: Can I validate a full document including the DOCTYPE? A: Yes, the validator handles both complete HTML documents and smaller code snippets or components.
Tip
Click any error message in the list to automatically scroll and highlight the issue in the code editor.