XML Validator
Validate XML structure and check for unclosed tags. Free browser tool — no signup.
Quick Answer
Paste XML to validate its structure: check for unclosed tags, mismatched elements, and report element and attribute counts.
How to Use the XML Validator
- Use the input area to provide your data.
- The tool processes it instantly in your browser.
- Copy or download the result.
Frequently Asked Questions
- What is the difference between valid and well-formed XML?
- Well-formed XML follows syntax rules (matching tags, proper nesting). Valid XML is well-formed AND matches a specific schema (DTD or XSD). This tool checks well-formedness — the foundational requirement.
What is XML Validator?
An XML validator checks whether your XML document is well-formed according to the XML specification. Well-formed XML requires every opening tag to have a matching closing tag, tags to be properly nested (no overlapping), elements to use consistent naming, and special characters to be properly escaped. Validation is essential before processing XML in applications, sending SOAP requests, deploying XML configuration files, and processing data feeds. This tool identifies specific structural issues: mismatched tags, unclosed elements, and nesting problems, along with reporting the number of elements and attributes found in the document.
How to Use XML Validator
- Paste your XML.
- Click Validate XML.
- See whether the document is well-formed or has issues.
- Review the specific errors or structural information.
Examples
<?xml version="1.0"?><catalog><book id="bk101"><title>XML Guide</title><price>9.99</price></book></catalog>
Common Use Cases
- Validating SOAP request envelopes before sending
- Checking XML configuration files for deployment
- Verifying RSS and Atom feed structure
- Debugging XML processing errors in applications
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