XML Formatter & Validator: Beautify, Minify and Validate XML Online
XML (eXtensible Markup Language) remains one of the most important data formats in enterprise software, web services, and configuration management. From SOAP APIs and RSS feeds to Android layouts and Maven build files, XML is everywhere in modern development. Our free XML formatter helps you beautify, minify, and validate XML documents instantly in your browser with no data sent to any server.
The beautifier takes any valid XML input and produces clean, properly indented output. You can choose between 2-space, 4-space, or tab indentation to match your project's coding standards. This makes deeply nested XML elements easy to read and debug, which is especially valuable when working with complex XSLT transformations, large configuration files, or verbose SOAP responses.
The minifier does the opposite, stripping all unnecessary whitespace to produce the most compact representation. This is ideal for reducing file size before transmission, embedding XML in other documents, or preparing data for systems that are sensitive to whitespace in XML content.
Beyond formatting, this tool performs real-time XML validation using the browser's built-in DOMParser. It catches common errors such as unclosed tags, mismatched element names, missing root elements, invalid characters, and malformed attributes. Clear error messages help you quickly locate and fix problems without searching through hundreds of lines of code.
Additional features include line numbers for easy reference, a full formatting history so you can revisit previous operations, one-click copy to clipboard, and direct download of the formatted XML file. Whether you are a backend developer working with web services, a DevOps engineer managing configuration, or a data analyst processing XML feeds, this tool streamlines your workflow.