Free Online XML Validator
Validate XML syntax for well-formedness according to W3C standards with detailed line numbers, element counts, and tree depth.
How to Use XML Validator
- Input XML String: Paste the XML snippet or document you want to check into the editor.
- Validate Syntax: Click 'Validate XML' to parse the document tree according to W3C specifications.
- Review Report: If valid, inspect root element, element count, attributes count, and tree depth. If invalid, inspect the syntax error coordinate.
Frequently Asked Questions
What is a well-formed XML document?
A well-formed XML document strictly conforms to W3C XML 1.0 rules: a single root element, properly closed matching tags, case-sensitive tag names, and correctly quoted attribute values.
What common XML errors does this tool detect?
It catches unclosed tags, mismatched opening/closing tags, unquoted attribute values, multiple root elements, and invalid characters.
What structural insights are shown for valid XML?
It computes total element nodes, total attributes, maximum document tree nesting depth, and identifies the root element tag.
Is my XML data kept private?
Yes, all validation occurs locally inside your browser's native DOMParser.