Paste your XML to validate syntax and find errors instantly.
What is Well-Formed XML?
Well-formed XML must follow these rules: it must have a single root element, all tags must be properly closed and nested, attribute values must be quoted, and special characters must be escaped (& < >). This validator checks all these rules using the browser's built-in XML parser.
Common XML Errors
- Mismatched tags — <tag> closed with </tg>
- Unclosed tags — Missing closing tag or self-closing slash
- Unescaped ampersand — Use & instead of &
- No root element — XML must have exactly one root
- Duplicate attributes — Each attribute name must be unique per element
FAQ
What is XML validation?
XML validation checks whether an XML document is well-formed, meaning it follows correct XML syntax rules. This includes proper tag nesting, matching opening/closing tags, quoted attributes, and a single root element.
What are common XML syntax errors?
The most common errors are: mismatched or unclosed tags, unescaped special characters like & and <, missing root element, duplicate attributes on the same element, and incorrect nesting of elements.
Is my XML data sent to a server?
No. All validation happens entirely in your browser using the built-in DOMParser API. Your XML data never leaves your computer, making this tool safe for sensitive content.