Developer•Free tool
XML Validator – Check XML Well-Formedness
Validate XML for well-formedness and get detailed error messages with line numbers. Also formats the XML for readability.
No sign-upBrowser-based
DEV
Tool
Enter your values and get results instantly.
HOW
How to Use
- 1Paste your XML\n2. The validator checks it instantly\n3. See errors with line numbers if any\n4. View the formatted output
WIN
Benefits
Instant well-formedness check
Line-numbered error messages
Auto-formatting
Copy or download
Private — runs locally
FAQ
Frequently Asked Questions
What does well-formed mean?
Well-formed XML has matching tags, correct nesting, valid attributes and a single root element. It does not require a schema (DTD/XSD) to be well-formed.
How are errors reported?
Errors show the exact message from the XML parser along with the line number so you can fix the problem quickly.
Can it format my XML too?
Yes, valid XML is formatted with indentation for readability, and you can copy or download it.