XML Formatter

Format, prettify, or minify XML with syntax validation and instant error feedback.

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How it works

Paste your XML. The tool parses it using the browser's built-in DOMParser (the same engine that renders web pages) to validate it and then re-serialises it with consistent indentation. If the XML is invalid, the parser error is shown immediately. Minify mode strips all whitespace between tags. Everything runs in your browser — your XML is never uploaded.

Common use cases

  • Prettifying a minified API response or config file to make it readable.
  • Validating that an XML document is well-formed before deploying it.
  • Cleaning up inconsistent indentation in an XML file.

Frequently asked questions

Does this support all XML features?

The tool handles standard XML including namespaces, CDATA sections, and processing instructions. DTD validation and XSD schema validation are not supported — it checks well-formedness only.

Can I format HTML with this?

Only valid XHTML (XML-compliant HTML) will parse correctly. Standard HTML5 is not XML and will often produce parsing errors. Use a dedicated HTML formatter for HTML.