XML Validator & Formatter
Validate XML documents for errors and format them with proper indentation. Instantly detect syntax problems and produce clean, readable XML.
What Does This Tool Do?
XML documents must follow strict syntax rules — proper tag nesting, closed tags, correct encoding, and more. This tool checks your XML against those rules and tells you exactly if and where errors are. It also reformats valid XML with proper indentation to make it easy to read.
Key Features
How to Use This Tool
- Paste your XML document into the Input box.
- Select "Validate + Format" to check and prettify, or "Minify" to compress.
- Click Process to run the validation and conversion.
- If there are errors, read the error message to find and fix the problem.
How It Works
The browser's built-in DOMParser is used to parse the XML. If parsing produces a parseerror document, the error details are extracted and shown. If the XML is valid, it's re-serialized and formatted with proper indentation by tracking nesting depth through opening and closing tags.
Common Use Cases
Frequently Asked Questions
What XML errors does it detect?
It detects all well-formedness errors: unclosed tags, mismatched tags, illegal characters, missing quotes on attributes, multiple root elements, and encoding issues.
Does it validate against an XML Schema (XSD)?
This tool checks for well-formedness (correct XML syntax) only. Schema validation against a specific XSD or DTD requires a more specialized validator.
Related Tools
Link to This Tool
Copy and paste the code below to link to this tool from your website: