XML Validator Online
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 Online
- Use the input area to provide your data.
- The tool processes it instantly in your browser.
- Copy or download the result.
Frequently Asked Questions
- Can I use this xml validator on mobile?
- Yes. This tool runs entirely in your browser and works on mobile devices, tablets, and desktop computers. No app download needed.
- 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.
About This Tool
The XML Validator Online is a free browser-based utility that processes XML data directly on your device without requiring any software installation, account registration, or server-side processing. When you paste your XML data and click the action button, the tool uses your browser's built-in capabilities to parse, validate, and transform the data instantly. This makes it ideal for quick tasks on shared computers, mobile devices, or any environment where you cannot install dedicated development tools. All processing happens locally — your data never leaves your browser, ensuring complete privacy and security. Whether you are working from a coffee shop, a client's office, or your phone, this online tool provides professional-grade XML processing with zero setup.
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 This Tool
- Paste your XML.
- Click Validate XML.
- See whether the document is well-formed or has issues.
- Review the specific errors or structural information.
Common Use Cases
- Working with JSON on a shared computer without installing software
- Quick formatting tasks without dedicated IDE tools
- Formatting JSON on mobile devices or tablets
- Browser-based workflows where local tools are unavailable
Examples
<?xml version="1.0"?><catalog><book id="bk101"><title>XML Guide</title><price>9.99</price></book></catalog>
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