XML Formatter
Format, validate, and minify XML data online. Auto-indent with error detection. 100% client-side processing.
What is XML?
XML (eXtensible Markup Language) is a markup language designed to store and transport data in a format that is both human-readable and machine-readable. Unlike HTML, XML allows you to define your own tags, making it extremely flexible for data interchange between different systems.
Paste your raw or minified XML into the editor. The tool instantly validates the syntax, highlights errors, and formats the output with your chosen indentation. Use the minify option to compress XML for production use.
XML is widely used in web services (SOAP), configuration files (Maven pom.xml, Spring beans), data feeds (RSS, Atom), office documents (OOXML, ODF), and SVG graphics. Despite JSON's popularity for APIs, XML remains essential in enterprise systems, government data exchange, and document-oriented applications.
Well-formed XML must have a single root element, properly nested tags, case-sensitive tag names, quoted attribute values, and properly escaped special characters (&, <, >, ", '). Understanding these rules helps you quickly identify and fix malformed XML documents.