Does this validate HTML5 void elements like and ?

Yes, it correctly recognizes self-closing void elements (img, br, hr, input, meta, link) without false unclosed tag warnings.

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HTML Validator

Validate HTML markup syntax, detect unclosed tags, duplicate IDs, and accessibility flaws.

How to Use HTML Validator

1Paste your HTML code into the editor.
2Click 'Validate HTML' to run structural, syntax, and accessibility audits.
3Inspect line numbers and error diagnostics in the issues panel.
4Copy the cleaned or corrected HTML markup.

Key Features & Benefits

Unclosed tag and mismatched nesting detection
Duplicate ID and invalid attribute checks
Basic accessibility alerts (missing img alt, empty links)
Interactive code editor with error line markers

About HTML Validator

Inspect HTML snippets and web pages for markup errors. Pinpoints unclosed elements, mismatched tag nesting, duplicate id attributes, missing alt tags on images, and invalid HTML5 semantics.

Unlike traditional web tools that send your personal data, uploaded photos, or sensitive text to remote cloud servers, our HTML Validator operates strictly inside your client browser sandbox. This guarantees high processing speeds without network throttling, and ensures your data privacy is completely preserved.

Frequently Asked Questions

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Developer ToolsPopular Tool100% In-Browser & Private

HTML Validator

Validate HTML markup syntax, detect unclosed tags, duplicate IDs, and accessibility flaws.

HTML5 Code Input

Inspect HTML syntax, unclosed tags, void element errors, and accessibility warnings.

Found 4 Syntax Errors

2 semantic / accessibility warnings detected.

Validator Diagnostics & Line Numbers

[Line 13]Mismatched tags: expected closing </p> (opened at line 11), but found </div>.

[Line 14]Mismatched tags: expected closing </div> (opened at line 8), but found </body>.

[Line 15]Mismatched tags: expected closing </body> (opened at line 7), but found </html>.

[Line 2]Unclosed tag <html> opened on line 2.

[Line 10]Accessibility warning: <img> tag is missing an 'alt' attribute.

[Line 12]Deprecated HTML tag <center> used. Consider using CSS or modern semantic elements instead.

How to Use HTML Validator

1Paste your HTML code into the editor.
2Click 'Validate HTML' to run structural, syntax, and accessibility audits.
3Inspect line numbers and error diagnostics in the issues panel.
4Copy the cleaned or corrected HTML markup.

Key Features & Benefits

Unclosed tag and mismatched nesting detection
Duplicate ID and invalid attribute checks
Basic accessibility alerts (missing img alt, empty links)
Interactive code editor with error line markers

About HTML Validator

Inspect HTML snippets and web pages for markup errors. Pinpoints unclosed elements, mismatched tag nesting, duplicate id attributes, missing alt tags on images, and invalid HTML5 semantics.