Does this XML validator check against XSD or DTD?

This validator checks XML well-formedness in the browser. It does not validate against external XSD or DTD schemas.

Is my XML file secure when I validate it?

Yes. Validation runs entirely in your browser. No XML data is uploaded or stored.

Can I validate large XML files?

Large files can be validated, but performance depends on your browser and device memory. Extremely large XML files may require server-side tools.

XML Validator Online

Q: How do I validate XML online?

Paste your XML into the validator and click Validate XML. The tool checks well-formedness and shows parsing errors with line and column details when available.

Q: Why is my XML not well-formed?

Common causes include unclosed tags, mismatched tag names, invalid characters, or incorrect nesting. The validator highlights the first detected parsing error.

Paste your XML to validate well-formedness and detect parsing errors. Runs locally in your browser — no uploads.

How to Use This XML Validator Online

This XML validator checks whether your document is well-formed according to XML syntax rules. It detects common structural issues and parsing errors instantly in your browser.

Step 1: Paste Your XML

Copy your XML content into the input box above. This can include API responses, configuration files, sitemap files, RSS feeds, or exported XML data.

Step 2: Click Validate XML

The tool parses your XML and checks for structural correctness. If an error is found, it reports the line and column number when available.

Step 3: Fix Errors and Revalidate

Correct the issue in your editor, paste the updated XML back into the validator, and run it again until the file is confirmed as well-formed.

What the XML Validator Checks

Matching opening and closing tags
Proper nesting of elements
Correct use of special characters and entities
Valid XML declaration structure
General parsing and syntax errors

Common XML Errors Explained

Mismatched Tags

Occurs when an opening tag does not match its closing tag. Example: <item> closed with </items>.

Unclosed Tags

Every opened element must be properly closed. Self-closing tags must use correct syntax.

Invalid Characters

Special characters like &, <, and > must be escaped correctly. Improper encoding can also trigger validation errors.

XML Well-Formed vs Valid XML

This tool checks for well-formed XML, meaning the document follows XML syntax rules. It does not perform schema validation against XSD or DTD files.

If you need schema validation, use a dedicated schema-aware validator. For understanding how XML compares to JSON in data structures, see our guide to understanding XML.

Why Use an Online XML Validator?

XML is widely used in APIs, configuration files, sitemaps, and enterprise integrations. A single missing tag can break parsing or prevent systems from processing your data.

This browser-based validator allows you to quickly check XML without installing software. Since validation happens locally, sensitive configuration files remain private.

Frequently Asked Questions

How do I validate XML online?

Paste your XML into the tool and click Validate XML. Errors will display with line and column details when available.

Does this validate against XSD or DTD?

No. This tool checks syntax and well-formedness only. Schema validation requires a dedicated XSD/DTD validator.

Why is my XML not well-formed?

The most common causes are mismatched tags, improper nesting, unescaped characters, or incomplete elements.

Is my XML data uploaded?

No. All validation runs entirely in your browser.

Can I validate API XML responses?

Yes. You can paste API responses directly to verify structure and detect parsing errors before integrating into applications.