XML Validator
Check XML for well-formedness and locate errors precisely.
XML Validator
Developer tool running locally in browser
What does XML Validator do?
Validate that an XML document is well-formed and get a precise error location when it is not. Catches the common failures: unclosed tags, mismatched names, unescaped ampersands and multiple root elements.
How to Use XML Validator
- 1Paste your XMLValidation runs as you type.
- 2Read the verdictWell-formed, or the exact failure position.
- 3Fix and re-checkErrors update live.
Key Features
- Well-formedness check using the browser’s native XML parser
- Error line, column and message shown in context
- Detects unescaped ampersands and angle brackets
- Element and attribute counts when the document parses
- Namespace declarations listed
Frequently Asked Questions
What are the most common XML errors?
An unescaped ampersand (& must be written &), a tag closed with the wrong name, more than one root element, and attribute values missing their quotes.
Why must I escape ampersands?
Because & begins an entity reference. A bare ampersand makes the parser look for an entity name and fail. Write & for a literal ampersand, and remember this applies inside URLs too.
Does it validate against a schema?
No, it checks well-formedness only. Schema validation against an XSD or DTD needs the schema document and a validating parser.
Can I validate an RSS feed here?
You can confirm it is well-formed XML, which catches most feed problems. For full RSS or Atom conformance use a dedicated feed validator, which also checks required elements.
Input is processed in your browser and never transmitted. That said, treat any web page as untrusted for live production secrets — rotate anything you paste anywhere.
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