Validate XML

Validate XML syntax and well-formedness online. Checks tag nesting, matching closing tags, attribute quotes, and XML 1.0 grammar with exact line, column, and visual code pointer diagnostics.

Private • In-browser processing • Zero server uploads

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How to Use Validate XML

1
Paste XML Data
Paste your XML markup or upload an `.xml` file.
2
Inspect Results
The tool analyzes your document immediately, checking tags, attributes, and structure.
3
Fix Highlighted Errors
Locate and correct any syntax discrepancies highlighted in the code pointer view.

Key Features

Well-Formedness Verification
Ensures every opening tag has an exact closing counterpart with correct nesting order.
Precise Error Positioning
Pinpoints the line and column where XML grammar was violated, complete with an ASCII pointer snippet.
Attribute & CDATA Checking
Validates quote encapsulation on attributes and proper termination of CDATA blocks.
Instant In-Browser Audit
Zero server uploads ensure complete security for confidential enterprise XML payloads.

Common Use Cases

  • Pre-validating XML before passing to strict XML parsers in Java (DOM/SAX), .NET, or Python.
  • Debugging broken SVG vector files that refuse to render in web browsers.
  • Verifying SOAP Web Service envelopes and WSDL documents.
  • Checking configuration files (such as Android manifests and Maven POMs) for missing tags.

Frequently Asked Questions

An XML document is well-formed if it follows XML 1.0 syntax: it has exactly one root element, every start-tag has a matching end-tag, tags are properly nested without overlap, attribute values are quoted, and reserved characters (`<`, `&`) are properly escaped.

This tool validates well-formedness according to the official W3C XML 1.0 specification. Well-formedness is the fundamental prerequisite required by all XML parsers before XSD schema validation can occur.

Yes! Elements with namespace prefixes (such as `<soap:Body>` or `<xmlns:xlink>`) are fully recognized.

Prettify XML
Format and indent an XML document for easy reading.
Minify XML
Compress XML by removing whitespace and comments.
XML to JSON
Convert an XML document to equivalent JSON structure.
Validate YAML
Check if a YAML document is valid and show a formatted parse tree.
Validate UTF8
Check if a sequence of bytes or text is valid UTF-8 and report any errors.