XML Formatter, Validator & Minifier

Format XML with proper indentation, validate against the XML spec, or minify to a single line. Uses the browser DOMParser for validation.

Runs 100% in your browser — nothing is uploaded.

XML input

Result

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
  <book id="1">
    <title>Refactoring
    </title>
    <author>Martin Fowler
    </author>
    <year>1999
    </year>
  </book>
  <book id="2">
    <title>Clean Code
    </title>
    <author>Robert Martin
    </author>
    <year>2008
    </year>
  </book>
</catalog>

Frequently asked

What XML parser does this use?

The browser's built-in DOMParser (application/xml mode). Same code path used by fetch() and XHR when handling XML responses.

Does it handle namespaces?

Yes — namespaces are preserved as-is. The formatter does not rewrite them.

What about XML entities?

Standard entities (&lt; &gt; &amp; &quot; &apos;) work. Custom DTDs are supported for parsing but not fully preserved on output.

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