Format, validate and pretty-print XML documents online. Instantly detect XML errors.
This free online XML formatter and validator parses your XML using the browser's native DOMParser engine, reports any well-formedness errors with a clear message, and outputs neatly indented, readable markup. It is perfect for developers working with REST/SOAP APIs, RSS feeds, SVG files, or configuration documents that use XML. No plugins or server calls required - everything runs locally in your browser.
The formatter uses the browser's built-in DOMParser API to parse your input as application/xml. If the document is not well-formed - for example a missing closing tag, unescaped ampersand, or mismatched namespace - the parser returns a <parsererror> element, and the tool extracts and displays that error message clearly. This provides the same validation engine used by browsers when rendering XML-based formats like SVG, XHTML, and Atom feeds.
Absolutely - all processing happens in your browser using native DOM APIs. No XML content is ever sent to a server, cached, or logged. This makes it safe to paste SOAP envelopes containing credentials, internal configuration files, or sensitive business data that must not be shared with a third-party service.
The tool handles any well-formed XML document including SOAP envelopes, RSS/Atom feeds, SVG files, Android AndroidManifest.xml, Maven pom.xml, Spring application context files, XHTML, and general-purpose configuration XML. It does not validate against a DTD or XML Schema (XSD) - it checks only well-formedness, which is the most common need when debugging XML data.
Well-formedness validation (what this tool does) checks that the XML follows the basic XML syntax rules: all tags are properly closed, attributes are quoted, and special characters are escaped. Schema validation additionally checks that the elements and attributes match a specific structure defined in a DTD or XSD file. For most debugging and formatting tasks, well-formedness validation is sufficient to catch the errors that cause parsers to fail.
Yes - the Minify button strips all whitespace between tags and collapses multi-space sequences, producing compact single-line XML suitable for embedding in payloads or reducing network transfer size. Note that minification removes all insignificant whitespace; if your XML uses mixed content (text nodes that contain meaningful whitespace), review the output carefully before deploying it to a production environment.