What is an XML formatter?
An XML formatter adds consistent indentation and line breaks so elements and attributes are easier to inspect.
XML Formatter & Editor
Format, edit, validate, beautify and safely minify XML online with namespace, CDATA and comment support. No sign-up required.
About the XML Formatter & Editor
Format, edit, validate, beautify and safely minify XML documents while preserving namespaces, comments and CDATA sections. Destructive whitespace changes are blocked for mixed-content XML, and external resources are never fetched.
- Namespace-preserving XML formatting
- CDATA and comment support
- Safe XML minification checks
- Malformed XML detection
How to use the XML Formatter & Editor
- Paste XML or upload an .xml file.
- Validate before formatting or minifying the document.
- Review the formatted XML, then copy or download the result.
Frequently Asked Questions
Can I validate XML syntax?
Yes. The validator detects malformed XML and reports parsing errors without sending the document to a server.
Does the XML validator fetch DTDs?
No. DevMaster Tools never fetches external XML resources.
Why can XML minification be refused?
Whitespace can be meaningful in mixed-content XML, so destructive transformations are blocked when safety cannot be guaranteed.
Is my XML uploaded?
No. XML processing happens locally in your browser.