XML Validator

XML validation is the process of checking whether an XML document follows the rules of XML syntax, including proper tag nesting, correct attribute usage, and well-formed structure.

The validator uses the browser's built-in DOMParser to parse XML and detect syntax errors, providing detailed error messages with line and column numbers.

The validator detects missing closing tags, mismatched tags, invalid characters, malformed attributes, incorrect nesting, and other syntax violations.

Yes, absolutely. All XML processing happens locally in your browser. Your data never leaves your device and is not sent to any server.

This validator focuses on syntax and well-formedness checking. For schema validation (XSD/DTD), you would need additional specialized tools.

Well-formed XML means the document follows basic XML rules: every opening tag has a closing tag, tags are properly nested, and there is a single root element.

Review the error message which shows the exact line and column. Common fixes include closing unclosed tags, fixing typos in tag names, and ensuring proper nesting.

Yes, the validator can handle XML files of various sizes. Performance depends on your browser's capabilities and available memory.

Yes, the validator correctly handles XML documents with namespaces, checking both syntax and namespace declarations.

Common mistakes include unclosed tags, case-sensitive tag mismatches (XML is case-sensitive), missing quotes around attributes, and special characters not properly escaped.

Yes, this XML validator is completely free with no limitations. You can validate unlimited XML documents without registration.

No installation required. The validator runs entirely in your web browser and works on any device with a modern browser.