Loading…

How to use HTML Validator

Paste your HTML, and the tool checks it for syntax errors, unclosed tags, and invalid attributes, listing every issue it finds.

Frequently asked questions

What validation errors does it catch?

The validator checks for unclosed tags, mismatched tags, invalid nesting, missing required attributes, duplicate IDs, and common syntax errors.

Does it validate HTML5?

Yes, the validator supports HTML5 elements and attributes. It checks against modern HTML standards while flagging deprecated elements.

Can it validate partial HTML snippets?

Yes, you can validate fragments like a single div or component. The validator will note missing document structure but check the fragment syntax.

More HTML Tools

HTML Cleaner
Strip unwanted tags, inline styles, Word HTML junk, and clean up messy code automatically
HTML Compressor
Compress HTML to reduce file size percentage with statistics on space saved
HTML to Text
Strip all HTML tags and extract plain text content only from HTML markup
HTML to Markdown
Convert HTML markup to clean Markdown syntax for documentation and content editing
Markdown to HTML
Convert Markdown syntax to proper semantic HTML markup with formatting preserved
HTML to JSX
Convert plain HTML to React JSX syntax with className, camelCase attributes, and proper structure
HTML Entities Encoder
Encode special characters to HTML entities like & < > " for safe display
HTML Entities Decoder
Decode HTML entities back to readable characters and symbols from encoded text
HTML Preview
Preview how HTML code renders in browser with live sandbox iframe visualization
HTML Table to CSV
Convert pasted HTML table markup into CSV and JSON. Parses rows and cells, auto-escaping commas, quotes and newlines
Newline to BR Converter
Convert plain-text line breaks into HTML <br> tags (nl2br), with an optional XHTML self-closing mode and a reverse br-to-newline mode
Text/SVG to Data URI
Encode text, SVG or CSS into a base64 or URL-encoded data URI you can embed inline in HTML or CSS with no external file

← View all HTML ToolsBrowse all 1,100+ tools →