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FreeToolConvert

XML Formatter & Validator

Pretty-print, minify and validate XML with clear error messages — using your browser’s own XML parser.

In-browser · no upload XML → XML

Runs entirely in your browser. Your files and text are not uploaded to our servers.

To format XML, paste it and select Format. Well-formed XML is indented neatly (attributes, comments, CDATA and the XML declaration are kept); malformed XML shows the parser’s error, such as a mismatched closing tag and its line.

How to use the XML Formatter & Validator

  1. 1

    Paste or open XML

  2. 2

    Format, minify or validate

  3. 3

    Copy or download

Features

  • Well-formedness check

    Uses the browser’s standards-compliant parser.

  • Keeps structure

    Comments, CDATA, processing instructions and declaration preserved.

Privacy and file handling

Where it runs
Runs in your browser

Runs entirely in your browser. Your files and text are not uploaded to our servers.

Limitations

  • Validates well-formedness only — not against an XSD or DTD schema.

Frequently asked questions

What does “well-formed” mean?

Every tag is closed and properly nested, attributes are quoted, and there is one root element. Schema validation (XSD) is a separate check.

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