XML Formatter
Format and indent XML documents with proper nesting. Validates syntax before formatting.
XML is used for configuration files (Maven, Android, .NET), SOAP APIs, data interchange, and document formats like SVG and DOCX. A single-line or poorly indented XML file is nearly impossible to read or debug. This XML formatter parses your XML document, validates it for well-formedness, and re-renders it with consistent 2-space indentation showing the full element hierarchy — making it easy to understand even deeply nested XML structures.
📋 How to Use This Calculator
Paste your XML into the input box, then click "Format XML." The tool first runs it through the browser's DOMParser to check for syntax errors — if the XML is malformed, you will see an error message from the parser. If valid, the formatted version appears with each element on its own line and child elements indented by 2 spaces relative to their parent. Click Copy to grab the formatted XML. The tool handles XML declarations (<?xml version="1.0"?>), CDATA sections, attributes, self-closing tags, and namespaces.
💡 Key Facts & Information
XML formatting follows the W3C XML 1.0 specification. A well-formed XML document must have a single root element, all tags must be closed (either with a closing tag or self-closing), attribute values must be quoted, and special characters (&, <, >, ", ') must be escaped as entities. The formatter uses the browser's native DOMParser — the same engine used for XHTML parsing — which guarantees that successfully formatted output is valid XML. Note that XML is case-sensitive: <Item> and <item> are different elements.