XML Validator
Validate XML syntax and check for well-formedness errors
Enter or upload XML data to validate
About this Tool
XML Validator is a free, privacy-first tool built for developers. Validate XML syntax and check for well-formedness errors
â100% Client-Side: All processing happens in your browser. No data is ever sent to our servers.
âFast & Efficient: Instant results with no server roundtrips or delays.
âFree Forever: No sign-up, no limits, no hidden fees. Use as much as you need.
âFile Support: Upload files directly or paste content. Your choice.
âHistory: Your recent conversions are saved locally for quick access.
Disclaimer
This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to our servers. While we strive for accuracy, please verify critical data before use in production environments. FormatKit is not responsible for any data loss, corruption, or issues resulting from tool usage.
Keyboard Shortcuts
How to Use XML Validator
Upload an XML file or paste your XML data into the input field and it will be automatically validated. The validator checks for XML well-formedness errors and provides detailed error messages with line and column numbers.
Features
- Instant validation as you type
- Detailed syntax error messages with line and column numbers
- Element and attribute counting
- Namespace detection
- XML declaration analysis
- Document structure preview
- Best practices warnings
Common XML Issues Detected
- Unclosed tags: Elements that are not properly closed
- Mismatched tags: Opening and closing tags that don't match
- Invalid characters: Characters that are not allowed in XML
- Attribute errors: Duplicate attributes or unquoted attribute values
- Namespace issues: Undefined or incorrectly used namespaces
- Encoding problems: Character encoding mismatches
FAQ
Q: Is my data secure?
Yes! All XML validation happens entirely in your browser. Your data never leaves your device.
Q: What's the maximum file size?
The validator can handle XML files up to 10MB. For optimal performance, we recommend files under 5MB.
Q: Does this validator check XML schema (XSD)?
No, this validator only checks XML well-formedness (proper syntax). It does not validate against XML Schema (XSD) or DTD. It ensures your XML is syntactically correct but doesn't verify it matches a specific schema definition.
Q: Can I use this to convert XML to JSON?
While this tool validates XML syntax, for conversion use our dedicated XML to JSON Converter.
Disclaimer: This validator checks XML well-formedness (syntax) but does not validate against XML schemas (XSD) or DTDs. For production systems, implement comprehensive validation including schema validation and business logic rules specific to your use case. This tool is provided as-is for convenience and educational purposes.