What is well-formed XML?

Well-formed XML follows basic syntax rules: has a root element, all tags are properly closed, tags are case-sensitive, attributes are quoted, and special characters are escaped.

Does this validate against XML Schema (XSD)?

Currently, this tool checks for well-formedness (syntax). Schema validation (XSD) is not yet supported but may be added in future updates.

Why does my XML show as invalid?

Common reasons include: unclosed tags, mismatched tag names (case-sensitive), unquoted attributes, invalid characters, or missing root element. Check the error message for the specific line number.

Can I validate SOAP XML?

Yes! SOAP messages are XML documents, so this validator works perfectly for checking SOAP request/response syntax.

What's the difference between XML and HTML?

XML is stricter than HTML. All tags must be closed, attributes must be quoted, and it's case-sensitive. HTML is more forgiving with syntax errors.

XML Validator

XML Validator Overview

Validate XML syntax and structure with detailed error reporting

XML Validator is a comprehensive syntax checker that validates XML documents for well-formedness, proper structure, and compliance with XML standards. XML (eXtensible Markup Language) is widely used for data exchange, configuration files, web services (SOAP), and document storage. A single syntax error in XML can break entire applications, making validation critical before deployment. This validator checks for common XML errors including unclosed tags, mismatched case, missing quotes around attributes, invalid characters, and improper nesting. It provides detailed error messages with line numbers, making debugging fast and efficient. When your XML is valid, the tool automatically formats it with proper indentation for improved readability. XML validation is essential for web developers working with SOAP APIs, system administrators managing configuration files, data engineers processing XML feeds, and anyone working with XML-based formats like SVG, RSS, or XHTML. The tool runs entirely in your browser, ensuring your XML documents remain private and secure.

How to Use XML Validator

Paste your XML content into the input textarea
Click 'Load Sample' to see example XML structure
Click 'Validate XML' to check syntax and structure
Review validation results: Valid (green) or Invalid (red)
If invalid, check the error message with line number
For valid XML, copy the auto-formatted output
Fix any errors and re-validate until XML is correct

Frequently Asked Questions

What is well-formed XML?: Well-formed XML follows basic syntax rules: has a root element, all tags are properly closed, tags are case-sensitive, attributes are quoted, and special characters are escaped.
Does this validate against XML Schema (XSD)?: Currently, this tool checks for well-formedness (syntax). Schema validation (XSD) is not yet supported but may be added in future updates.
Why does my XML show as invalid?: Common reasons include: unclosed tags, mismatched tag names (case-sensitive), unquoted attributes, invalid characters, or missing root element. Check the error message for the specific line number.
Can I validate SOAP XML?: Yes! SOAP messages are XML documents, so this validator works perfectly for checking SOAP request/response syntax.
What's the difference between XML and HTML?: XML is stricter than HTML. All tags must be closed, attributes must be quoted, and it's case-sensitive. HTML is more forgiving with syntax errors.

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