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Free Online XML Validator

Use this free online XML Validator to verify that your XML document complies with the XML specification and follows the required syntax and structural rules. Enter your XML into the editor or upload an XML file from your device, then run the validation to examine the document.

After the validation is complete, you’ll receive a clear validation report indicating whether your XML document passes the required syntax and structural checks or contains validation errors. When an error is detected, a descriptive error message is provided, and you can also review the highlighted error and its corresponding line number inside the editor for faster troubleshooting. If you’d like to improve the readability of your XML before validating, you can use our XML Formatter.

XML Validator

Valid & Invalid XML Example

Valid XML

The XML document below is valid because every opening tag has a matching closing tag, the elements are properly nested, and there is a single root element.

<?xml version="1.0" encoding="UTF-8"?>
<library>
    <book>
        <id>101</id>
        <title>Learning XML</title>
        <author>Jane Smith</author>
        <year>2025</year>
    </book>
    <book>
        <id>102</id>
        <title>Web Development Basics</title>
        <author>Michael Adams</author>
        <year>2024</year>
    </book>
</library>

Invalid XML

The XML document below is invalid because the <title> element is not closed correctly, causing the XML structure to break.

Invalid XML

<?xml version="1.0" encoding="UTF-8"?>
<library>
    <book>
        <id>101</id>
        <title>Learning XML
        <author>Jane Smith</author>
        <year>2025</year>
    </book>
    <book>
        <id>102</id>
        <title>Web Development Basics</title>
        <author>Michael Adams</author>
        <year>2024</year>
    </book>
</library>

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