XML Formatter

Yes, the formatter uses the browser's DOMParser to validate XML. If the XML is malformed (unclosed tags, mismatched tags), the error is displayed in the output pane with a helpful message.

The formatter uses 2-space indentation by default. Each nesting level increases the indent, and closing tags are aligned with their opening tags for readability.

XML is a strict markup language for structured data — all tags must close, attributes must be quoted, and there's exactly one root element. HTML is more forgiving and designed for web page display. XML is commonly used for APIs (SOAP), config files, and data interchange.

This tool checks well-formedness (proper tag structure, closing tags, attribute quotes). It does not validate against DTD or XSD schemas. For schema validation, use a dedicated XML validator or IDE with XML schema support.

Yes. The formatter handles typical XML documents efficiently. For very large files (100MB+), browser memory limits may apply. Most config files and API responses are well within comfortable limits.

The XML formatter works best with valid XML. For HTML specifically - especially HTML5 with unclosed tags like <br> - we recommend using the HTML Formatter tool instead, which is designed for HTML's quirks.