Free XML Validator Online
Validate your XML documents for syntax errors with our free online XML Validator. Paste your XML code and instantly check for well-formedness, missing closing tags, attribute errors, and other common XML issues. The validator provides clear error messages with line numbers to help you quickly find and fix problems. Essential for developers working with XML configurations, web services, RSS feeds, SVG files, and data exchange formats. All validation happens in your browser — your XML content is never sent to any server. No installation needed, no sign-up required.
How to Use XML Validator
Paste XML Code
Paste your XML content into the editor or upload an XML file.
Validate
Click Validate to check your XML for syntax errors and well-formedness.
Review Results
See validation results with error messages and line numbers for quick fixes.
Features
Syntax Checking
Validates XML well-formedness including tags, attributes, nesting, and encoding.
Error Line Numbers
Get precise error locations with line numbers for quick debugging.
Instant Validation
Results appear immediately as you validate — no waiting or server processing.
Large File Support
Handle large XML documents efficiently with browser-based parsing.
Benefits of Using XML Validator
Completely Free
Use XML Validator without any cost, limits, or hidden fees. No premium plans needed.
No Installation
Works directly in your browser. No software downloads or plugins required.
100% Private
Your files and data are processed locally. Nothing is uploaded to external servers.
Works Everywhere
Compatible with Chrome, Firefox, Safari, Edge on desktop, tablet, and mobile.
No Sign-Up
Start using the tool immediately. No account creation or email verification.
Always Available
Access this tool 24/7 from anywhere in the world, on any device.
Frequently Asked Questions
Complete Your Developer Tools Workflow
These free tools work seamlessly with XML Validator to handle every step of your workflow.