About the XML Validator
Find mismatched and unclosed tags and other well-formedness errors, with the line number where possible.
XML Validator
Check that XML is well-formed: matching tags, one root element and properly closed markup.
- Paste your input
- Choose the options
- Copy the output
Runs in your browser. Your data and files never leave your device.
Frequently asked questions
Does it validate against an XSD or DTD?
No — it checks well-formedness, which every XML document must pass before schema validation.
What does well-formed mean?
Every opening tag has a matching closing tag, elements are nested properly, there is exactly one root element, attribute values are quoted and special characters are escaped.
Does it validate against a DTD or XSD?
No — it checks well-formedness, which is what most parsing errors are about. Schema validation needs the schema file.
Related tools
- XML FormatterPretty-print XML with clean indentation, and minify it again when you need to.
- JSON ValidatorCheck whether JSON is valid and find the exact line and column of any syntax error.
- Text Diff CheckerCompare two texts and highlight what was added and removed, word by word or line by line.
- Microphone TestCheck your microphone is working before a call: see the input level live and record a 5-second clip to hear yourself.
- Webcam TestCheck your webcam works, see its resolution and switch cameras — and take a photo. Nothing is uploaded.
- Keyboard TesterPress every key and see it light up — find keys that don’t work, stick or register the wrong key.