XML Formatter & Beautifier

What Is an XML Formatter?

An XML formatter takes raw, minified, or poorly formatted XML and reformats it with proper indentation, line breaks, and syntax highlighting. XML (Extensible Markup Language) is used extensively in enterprise software, web services, configuration files, and data interchange. Our free XML formatter and beautifier handles formatting, validation, and minification — all using the browser's native DOMParser API with zero external dependencies, keeping your data completely private.

How to Use This XML Formatter

Paste your unformatted XML into the input editor or upload an .xml file. Choose your preferred indentation style (2 spaces, 4 spaces, or tabs). Click "Format XML" to instantly beautify and validate your XML. The tool checks for well-formedness errors and reports the exact line and column of any problems. Copy the formatted output or download it as a file. Use Minify mode to compress XML for production use.

Key Features

• XML beautification — proper indentation, line breaks, and tag nesting
• XML validation — catches mismatched tags, unclosed elements, and syntax errors
• Error reporting — pinpoints exact line and column of each error
• Syntax highlighting — color-coded tags, attributes, values, comments, and CDATA
• Minify mode — compress XML by removing all unnecessary whitespace
• Native DOMParser — uses the browser's built-in XML parser for accurate results

XML Formatting and Validation

The formatter uses the browser's native DOMParser API to parse and validate your XML. This ensures accurate handling of all XML features including namespaces, CDATA sections, processing instructions, comments, entities, and deeply nested element hierarchies. The parser catches all well-formedness violations defined by the XML 1.0 specification — mismatched tags, unclosed elements, invalid characters, missing attribute quotes, duplicate attributes, and malformed entities. Error messages include the exact line and column number for quick debugging.

Common Use Cases

• API developers — formatting SOAP responses and REST XML payloads for debugging
• Java and .NET developers — formatting Spring configuration files, Maven pom.xml, and .csproj files
• Android developers — formatting layout XML, AndroidManifest.xml, and resource files
• Data engineers — formatting RSS feeds, Atom feeds, and XML data exports
• DevOps engineers — formatting CI/CD configuration files and deployment descriptors

Tips and Best Practices

Use 2-space indentation for XML files that are part of web projects, and 4-space indentation for enterprise Java/Spring configurations. When formatting XML with namespaces, the tool preserves all namespace declarations and prefixes correctly. For XML with embedded CDATA sections, the content inside CDATA is preserved as-is without reformatting. If the formatter reports a validation error, fix the error in the input and reformat — the tool cannot format invalid XML because the parser cannot build a proper document tree from malformed input. For large XML files, use the minify mode to check size savings before optimizing your build pipeline.