XML Validator - Validate XML Code Online
Validate XML code and check for well-formedness errors. Shows error messages with line numbers. Free online developer tool.
XML Code
Result
Click "Validate XML" to check your code...
Free XML Validator & Checker
Validate your XML code instantly. Paste your XML and get a clear pass/fail result with detailed error messages including the line number where the problem was found.
How to Use It
Paste your XML into the input panel and click "Validate XML." The tool uses the browser's built-in DOMParser to check whether your XML is well-formed. If valid, it also counts elements, attributes, and text nodes. If invalid, it shows the error message and the line number.
Example
Valid XML like <note><to>Alice</to></note> passes validation and shows a node count. An unclosed tag like <note><to>Alice</note> fails with an error indicating the expected closing tag.
Common Use Cases
- Checking XML files before importing them into an application.
- Validating API responses that return XML.
- Debugging malformed XML generated by code or templates.
FAQs
Does this validate against an XSD or DTD?
No — this tool only checks whether the XML is well-formed (proper nesting, matching tags, valid structure). It does not validate against a schema or DTD.
Is my XML uploaded anywhere?
No — parsing happens entirely in your browser using the native DOMParser API. No data leaves your device.