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XML Validator

Check XML well-formedness with browser parsing and inspect syntax errors. This validator does not run XSD schema checks and rejects DTD/entity declarations.

Check whether pasted XML can be parsed as a document before using it in an integration. The result addresses well-formed syntax, such as matching tags and quoted attributes. It does not validate an XSD, resolve a DTD or prove that the document meets an application's required data model.

  • 100% free
  • No registration
  • On your device
  • Modern browser
  1. 1Enter details
  2. 2Adjust options
  3. 3View result
ResultLive
Your input stays on this device for this operation. We don’t upload or store it.
About XML Validator
Check whether pasted XML can be parsed as a document before using it in an integration. The result addresses well-formed syntax, such as matching tags and quoted attributes. It does not validate an XSD, resolve a DTD or prove that the document meets an application's required data model.
Browser syntax parsing
Checks the current source using the browser's XML parser.
Focused validation result
Returns a syntax status rather than reformatting the document.
Unsupported declarations rejected
Blocks DTD and entity-declaration input instead of claiming to validate those document models.
How to use XML Validator
  1. 1
    Paste the XML document
    Enter XML in Source text. Leading and trailing clipboard whitespace are trimmed outside the document.
  2. 2
    Press Process
    Read Valid XML syntax or the browser parser's error message. DTD and entity declarations are unsupported.
  3. 3
    Correct and recheck
    Edit the source and run Process again. Use XML Formatter separately if you also need readable indentation.
Formats and practical limits
Input: a pasted XML document up to 100,000 JavaScript string units. Output: a syntax-status message or parser error, with a copyable result.
  • No XSD, DTD, external-resource or application-rule validation.
  • Parser wording depends on the browser. A successful syntax check does not establish safe downstream use, correct business values or valid document permissions.
Practical example
<root><item>1</item></root> is well formed. <root><item></root> has mismatched tags. A well-formed document can still omit a field required by your receiving application's schema.
Frequently Asked Questions
3 answers
Does Valid XML syntax mean my XSD passed?
No. Well-formedness and schema validity are different checks. No XSD or application-schema validation runs here.
Can I validate a document with a DOCTYPE?
DTD/DOCTYPE and entity declarations are rejected by the current implementation. Use a deliberately configured validator when that is a requirement.
Are normal entity references such as &amp; allowed?
XML's predefined entity references are handled by the parser. A bare unescaped ampersand can cause a syntax error; this does not mean custom entity declarations are supported.
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