About XML Validator & Syntax Checker
Validate XML documents online with instant DOMParser verification. Detects unclosed tags, attribute quotation errors, and malformed tags 100% in-browser.
Key Capabilities & Features
- Real-time XML well-formedness verification
- Highlights exact syntax errors and parsing issues
- Format and beautify validated XML with custom indent
- Works with SOAP, RSS, SVG, and custom XML schemas
How to Use XML Validator & Syntax Checker
1
Input XML
Paste your XML code into the editor.
2
Check Errors
View immediate validation feedback and parser warnings.
3
Beautify
Format the verified XML cleanly for production use.
Privacy & In-Browser Execution Guarantee
100% client-side validation. Your XML payloads remain completely private.
Frequently Asked Questions
What is a well-formed XML document?
A well-formed XML document conforms to the XML 1.0 syntax rules: every start tag has a matching end tag, tags are correctly nested, and attributes are properly quoted.