XML (eXtensible Markup Language) is used extensively in APIs, configuration files, data exchange formats, and enterprise applications. Poorly formatted XML is hard to read, and invalid XML breaks parsers and integrations. This tool formats, prettifies, minifies, and validates XML documents with syntax highlighting and detailed error reporting.
Format, minify, and validate XML documents. Uses the browser's DOMParser for validation.
Paste your XML content into the input editor. Click 'Format' to prettify the XML with proper indentation and line breaks, or 'Minify' to compress it by removing all unnecessary whitespace. The tool validates your XML in real time, displaying error messages when it encounters malformed markup.
XML formatting and validation is needed when debugging SOAP API requests and responses, inspecting and editing Maven pom.xml or Ant build.xml configuration files, reviewing SVG files and RSS/Atom feed content, working with Android layout XML files, processing healthcare data in HL7/FHIR XML format, handling financial data in XBRL or FpML formats, editing Salesforce metadata XML files, preparing XML test fixtures for unit and integration tests, and minifying XML for bandwidth optimization in API responses.
The formatter uses the browser's built-in DOMParser to parse XML, which provides strict well-formedness checking per the XML 1.0 specification. Parsing errors include details about mismatched tags, invalid characters, missing closing tags, and malformed attribute values. The prettifier uses a recursive serialization algorithm that tracks nesting depth for proper indentation. Minification removes non-significant whitespace between tags.
Well-formed XML follows basic syntax rules: properly nested tags, quoted attribute values, a single root element, and correct character encoding. Valid XML additionally conforms to a schema (DTD, XSD, or RelaxNG) that defines allowed elements, attributes, and structure. This tool checks well-formedness; schema validation requires a separate step.
Click the 'Minify' button to remove all non-significant whitespace from your XML, including indentation, line breaks between tags, and trailing spaces. This reduces file size for transmission while preserving the document's meaning and structure. Whitespace within element text content is preserved.
The tool handles XML documents up to several megabytes using the browser's native DOMParser. Processing is synchronous, so very large files (10MB+) may briefly freeze the browser tab during formatting or minification.
Transform, format, generate, and encode data instantly. Private, fast, and always free.
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