XML Formatter

An XML formatter is a tool that takes a raw XML document and re-indents it so each element sits on its own line with consistent nesting, making the hierarchy readable at a glance. XML remains everywhere: SOAP web services, RSS and Atom feeds, Maven and Spring config files, SVG graphics, Office Open XML (.docx, .xlsx internals), and countless legacy data exports. When these arrive minified or with mixed whitespace, tracing which closing tag matches which opening tag becomes painful. This formatter parses the document, checks it for well-formedness, and rewrites it with clean indentation at every level. Well-formedness is the core XML rule set: every opening tag needs a matching closing tag, elements must nest without overlapping, attribute values must be quoted, and the document needs a single root element. When any of these break, the tool reports the problem with a line number so you can jump straight to it rather than scanning thousands of lines. A common gotcha worth knowing: well-formedness is not the same as validity. A document can be perfectly well-formed yet still violate the rules of a DTD or XSD schema (wrong element order, missing required attributes, illegal data types). This tool checks the former, not the latter, so it confirms your XML is structurally sound but cannot confirm it matches a specific contract. Namespace prefixes such as soap: or xsi: are preserved and treated as ordinary attributes, and CDATA sections, comments, and processing instructions are kept intact. Everything runs locally in your browser, so XML containing internal endpoints, table names, or customer records never leaves your machine.