XML Syntax Validator

Validate XML syntax, verify well-formedness, and locate unclosed tags or parser errors.

How It Works & Processing Standards

Validate XML syntax, verify well-formedness, and locate unclosed tags or parser errors.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Desktop max file size: 50MB
  • Mobile max file size: 20MB

XML Syntax Validator is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use XML Syntax Validator

  1. 1
    Paste XMLPaste XML content into the validator.
  2. 2
    ValidateInspect syntax validation status and error logs.
  3. 3
    Fix ErrorsNavigate to exact line and column numbers to correct any issues.

Examples

Valid Document
Input: <root><item id="1">Text</item></root>
Result: Valid XML: Document is well-formed.

Common Use Cases

  • Checking RSS feeds and sitemap.xml files prior to publishing
  • Troubleshooting SOAP web service request failures
  • Verifying Android layout XML or SVG vector files for syntax errors

Frequently Asked Questions (FAQ)

What constitutes a well-formed XML document?

A single root element, properly closed and matched tags, quoted attributes, and correctly escaped entities (<, >, &).

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