XML Validator

An XML Validator checks your XML documents for syntax correctness and well-formedness according to the XML specification. It parses your markup and reports errors such as unclosed tags, mismatched elements, illegal characters, missing declarations, and attribute quoting issues — giving you immediate, actionable feedback without needing to run a full application stack.

For developers, valid XML is non-negotiable. Whether you're building data pipelines, configuring application servers, working with SOAP APIs, or authoring SVG and RSS feeds, malformed XML causes silent failures and hard-to-debug runtime errors. A dedicated validator lets you catch these problems early, during authoring or integration, before they reach production.

To use the validator, paste your raw XML into the input area and trigger the validation. The tool parses your document from top to bottom, checking that every opening tag has a matching closing tag, that attributes are properly quoted, that the document has a single root element, and that any special characters are correctly escaped. If your XML is well-formed, you'll receive a clear confirmation. If not, you'll see a precise error message indicating the line and column where the problem was detected.

The input can be anything from a single XML fragment to a full document with an XML declaration and namespace definitions. The validator handles multi-level nesting, CDATA sections, XML comments, and processing instructions. You do not need to include a DOCTYPE or schema reference — well-formedness validation is purely structural and does not require a schema.

One important edge case: this tool validates well-formedness, not schema validity. A document can be well-formed (syntactically correct XML) but still violate a specific XSD or DTD schema. If you need schema validation, you'll want a more specialized tool. Also note that character encoding issues — such as invalid UTF-8 sequences — can trigger parsing errors, so ensure your source encoding is consistent before pasting.