XML Code Formatter
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Free Online XML Validator & Formatter Tool
XML documents require both proper structure and readability for effective data exchange. Our all-in-one XML toolvalidates your markup against W3C standards while simultaneously formatting it with perfect indentation, line breaks, and syntax highlighting.
Whether you're working with configuration files, SOAP APIs, or complex data feeds, this tool helps you maintain error-free, well-structured XML with instant validation feedback and professional formatting.
How to Validate & Format XML in 3 Steps
- Paste your XML – Input any XML data (minified, unformatted, or partial document)
- Click "Validate & Format Code" – Get instant validation results and perfectly indented XML
- Review and fix – Address any errors highlighted by the validator
Pro Tip: Validate against DTD or XML Schema for advanced structure verification.
XML Validation Features
- Syntax checking – Detect unclosed tags, invalid characters, and malformed markup
- Standard compliance – Validate against XML 1.0 and 1.1 specifications
- Error pinpointing – Exact line and column numbers for quick fixes
- Schema validation – Optional validation against DTD or XSD schemas
XML Formatting Features
- Smart indentation – Clear hierarchy with 2-space or 4-space options
- Attribute alignment – Consistent formatting for multiple attributes
- Comment preservation – Maintains all <!-- comments --> exactly as placed
- Namespace handling – Proper formatting for xmlns declarations
Why Validate and Format XML?
Validation Benefits
- Ensure data integrity in enterprise systems
- Prevent processing errors in XML parsers
- Meet compliance requirements for data exchange
Formatting Benefits
- Understand complex nested structures at a glance
- Simplify collaboration between developers and analysts
- Maintain large configuration files efficiently
Key Use Cases
- Enterprise integration – Validate SOAP messages and B2B data feeds
- Configuration management – Clean up server.xml and other config files
- Data migration – Ensure XML integrity during system upgrades
- Documentation – Produce readable XML samples for technical docs
- Education – Learn proper XML syntax with instant feedback