Free XML Validator Online
Validate XML syntax with detailed error messages.
Key Features
✅ Instant Validation
Validate XML syntax instantly as you type with real-time feedback.
🔍 Error Details
Get detailed error messages with line numbers to quickly locate issues.
⚡ Fast Processing
All operations run locally in your browser for instant results.
🔒 Privacy Protected
Your data never leaves your browser. No server storage.
How to Use XML Validator
Paste Your XML Code
Enter or paste your XML data into the input area.
Click Validate
Press the "Validate" button or let the tool auto-validate as you type.
View the Result
See validation results with error details in the output area.
Frequently Asked Questions
Basics
What is XML validation?
XML validation is the process of checking whether an XML document is well-formed (follows XML syntax rules) and optionally valid against a schema or DTD.
What makes XML well-formed?
Well-formed XML must have: a single root element, properly nested and closed tags, quoted attribute values, and correct character encoding.
Common Errors
What are common XML errors?
Common XML errors include: unclosed tags, mismatched tag names, missing root element, unquoted attribute values, and illegal characters.
Does XML require a declaration?
The XML declaration (<?xml version="1.0"?>) is optional but recommended. It specifies the XML version and encoding used in the document.