XML Formatter & Beautifier

Minification removes all whitespace between tags (spaces, tabs, newlines that are not part of text content) to produce the most compact representation of the XML. It does not change the document's data or logical structure. Minified XML is useful for reducing payload size in API communications, stored configuration, and network transfers. For reference, a well-indented XML file might shrink 15-35% when minified, depending on how deeply nested and how many comments it contains.

The validator checks well-formedness — whether the XML follows the syntactic rules of XML: every opening tag has a matching closing tag, tags are properly nested (no overlapping), attribute values are quoted, special characters are escaped (& < > ' "), and the document has exactly one root element. Well-formedness is separate from validity (whether the document conforms to a specific schema like XSD or DTD) — this tool checks structure only, not schema conformance.

Yes. CDATA sections (<![CDATA[...]]>) are preserved without modification — the content inside them is treated as literal text and not re-parsed. XML comments (<!-- ... -->) are preserved in the formatted output. Processing instructions (<?target data?>) and namespace declarations (xmlns:prefix="uri") are also handled correctly. The formatter uses the browser's native DOMParser for XML parsing, which handles these features reliably.

XML namespaces (declared with xmlns or xmlns:prefix attributes) are preserved exactly as they appear in the input. The formatter does not reorder, collapse, or modify namespace declarations. SOAP envelopes, XHTML documents, and other namespace-heavy formats format correctly. If you see namespace-related issues in the formatted output, they were present in the original XML — use the Validate function to identify specific errors.

Well-formed XML meets the basic XML syntax rules: proper tag nesting, quoted attribute values, single root element, escaped special characters. Any XML parser can read well-formed XML. Valid XML also conforms to a Document Type Definition (DTD) or XML Schema Definition (XSD) that specifies which elements are allowed, in what order, and with what attributes. This tool validates well-formedness. For schema validation, you need a tool that accepts an XSD file.

Both are text-based data exchange formats. XML is more verbose but more expressive: it supports attributes, namespaces, CDATA, mixed content (text and elements together), and comments. It has robust schema validation via XSD and querying via XPath/XQuery. JSON is more compact, more readable for simple nested objects, and is the default in modern REST APIs and JavaScript-based applications. XML dominates in: SOAP web services, enterprise integration (SAP, EDI), document formats (DOCX, SVG, RSS/Atom), and any system where schema validation and metadata are important.

No. All formatting, minification, and validation runs in your browser using the native DOMParser API and JavaScript. Your XML documents, whether they contain configuration data, connection strings, or application content, never leave your device.