HTML Validator
Check your HTML for structural errors, unclosed tags, and malformed attributes using the browser's DOMParser.
Results will appear here after validation…
How to Use
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1
Paste your HTML code into the left panel.
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2
Click Validate HTML — errors appear in the right panel with type labels.
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3
Fix each error and validate again until no issues remain.
📖 Want to learn more?
Read our in-depth guide: tips, best practices, FAQs, and real-world examples.
- Always include <!DOCTYPE html>
- Every img tag needs an alt attribute
- Semantic HTML improves both SEO and accessibility