Developer
HTML5 Validator
Check your HTML5 code for syntax errors and standards compliance.
Validation Result
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How It Works
Paste your HTML. The tool checks for a doctype, mismatched closing tags, and unclosed elements. Note: This is a basic checker, not as thorough as the W3C validator.
Example
A missing closing
tag will be flagged as an unclosed element.Frequently Asked Questions
Does it check all HTML5 rules?
No, it focuses on common structural errors. For a full validation use the W3C validator.
Can I validate SVG or MathML?
Basic checking works, but specialised validation is limited.