What are common XML syntax errors?

Common errors: 1) Unclosed tags; 2) Case mismatch in tag names; 3) Missing quotes on attributes; 4) XML declaration not on first line; 5) Unescaped reserved characters (&, ); 6) Multiple root elements.

Does it support DTD/Schema validation?

This tool performs basic well-formedness validation using DOMParser. It does not validate against DTD or XML Schema. For full schema validation, use a professional IDE like IntelliJ or VS Code.

Absolutely. All processing happens locally in your browser. XML content never leaves your device and is never uploaded to any server.

XML Validator - Free Online XML Syntax Checker

Q: How does the XML validator work?

The validator uses the browser's built-in DOMParser API to parse XML. If the XML is well-formed, it displays formatted output. If errors exist, DOMParser returns detailed error information including line number, column number, and error description.

Q: Can I upload XML files?

Yes. Click the upload button to select a local XML file. Content is read into the editor locally — nothing is uploaded to any server.

📖 FAQ

How does the XML validator work?

Uses the browser's built-in DOMParser to parse XML. Well-formed XML shows formatted output; errors show detailed location and description.

What are common XML errors?

Unclosed tags, case mismatch, missing quotes on attributes, unescaped special characters, multiple root elements.

Can I upload XML files?

Yes. Click Upload to select a local file. Content is read locally — nothing is uploaded to any server.

Does it check DTD/Schema?

This tool performs basic well-formedness checks only. For DTD/Schema validation, use a professional IDE.

Is my data safe?

Absolutely. All processing is local. XML content never leaves your browser.