Free Online XML Validator & Syntax Checker
Validate XML files and code snippets online. Check for well-formedness, unclosed tags, attribute syntax errors, and structural issues instantly. 100% free and client-side.
Key Features of Our Online XML Validator
Real-Time XML Parsing
Uses native browser DOMParser to validate strict XML well-formedness and tree structure.
Detailed Error Feedback
Get clear diagnostic error messages detailing missing tags, attribute typos, or broken markup.
Multiple Input Methods
Paste direct XML, fetch a remote XML file via URL, or upload local .xml documents.
100% Client-Side & Private
Your XML data remains private and secure. All processing happens locally in your browser.
How to Use the XML Validator
- Paste your XML markup into the input text box, or upload an .xml file.
- Click on the "Validate XML" button to run structural parsing.
- Review the validation status and error logs in the right-side result pane.
- Fix any reported tag or attribute errors and copy your clean XML.
Frequently Asked Questions (FAQs)
What does "well-formed XML" mean?
Well-formed XML satisfies strict structural rules: it has a single root element, correctly matched opening and closing tags, proper nesting, and quoted attributes.
Is my XML sent to an external server?
No. All parsing runs directly in your web browser using JavaScript DOMParser APIs.