XML Validator
Validate XML syntax and check for errors
Input XML
Validation Result
What is XML Validator?
Need to check if your XML is valid? This tool checks your XML code for syntax errors and validates it against the official XML specification. Whether you're debugging API responses, checking configuration files, or learning XML, the validator instantly tells you if your XML is valid or where the errors are.
XML validation is crucial for ensuring data integrity. The validator follows the W3C XML specification, so you can trust the results.
Everything runs in your browser – your XML never leaves your computer. Fast, secure, and completely free.
What Makes This Tool Different
Instant Validation
Paste your XML and get results right away. Valid XML gets a green badge, invalid XML shows you exactly where the problem is.
Detailed Error Messages
When something's wrong, we tell you the exact line, column, and what went wrong. No guessing – you'll know exactly what to fix.
File Upload Support
Got a big file? Just upload it. No need to copy-paste those massive config files or API dumps.
Sample Data
Try it out with sample data. We've got examples of valid XML so you can see how it works.
Standards Compliant
We validate against the official XML standards. If it passes here, it'll work anywhere – any parser, any API, any app.
Syntax Highlighting
Nice syntax highlighting makes it easy to spot problems before you even validate. Visual feedback helps catch issues early.
How It Works
Paste or Upload XML
Paste your XML code into the left editor, or click "Upload" to load a file. You can also click "Sample" to see an example of valid XML.
Automatic Validation
The validator automatically checks your XML as you type. The right panel shows the validation result with a clear badge – green for valid, red for invalid. If there are errors, you'll see detailed error messages.
Fix and Verify
If your XML is invalid, use the error messages to fix the issues. Common problems include missing closing tags, unclosed elements, or invalid characters. Fix the errors and watch the validation status update in real-time.
When You'd Actually Use This
API Development
Validate XML responses before processing them. Catch XML errors early in development. Works great with SOAP APIs or REST APIs that return XML.
Config File Checks
Before deploying, validate your XML configuration files. One syntax error can break your entire application. Catch it early with the validator.
Learning XML
New to XML? Use the validator to check your work. Practice writing XML and see if it's valid before using it in your projects.
Debugging
Getting parsing errors in your code? Validate the XML first. Detailed error messages help you find the exact problem faster than trial and error.
Common Questions
Is my XML data stored?
Nope. Validation happens right in your browser using JavaScript. Your XML never leaves your computer.
What makes XML invalid?
Common issues include: missing closing tags, unclosed elements, invalid characters, mismatched tags, or incorrect nesting. The validator catches all of these.
Does it validate against XML Schema?
This tool validates XML syntax only, not XML Schema (XSD). For schema validation, you'll need specialized tools that support XSD validation.
What XML standards does it follow?
We follow the W3C XML specification. If it validates here, it's valid XML.
Can I validate large files?
Yes. Since validation happens in your browser, performance depends on your device. Small files validate instantly. Very large files (10MB+) might take a few seconds.
Why does my XML show as invalid?
Check the error message – it tells you exactly what's wrong. Common fixes: add missing closing tags, ensure all elements are properly nested, check for invalid characters, and verify attribute syntax.
Other XML Tools You Might Need
Validation is just one step. Here are other tools that work well together:
Need to learn more about XML? Check out the official W3C XML website or the comprehensive guide on MDN.