XML Formatter — Free Online Formatter
Pretty-print and validate XML documents
All processing happens locally. No data is sent to any server.
XML documents are often minified or poorly formatted when received from APIs, data feeds, or configuration files. Our XML Formatter pretty-prints XML with consistent indentation, making it human-readable. It also validates the structure, catching unclosed tags and mismatched elements. Paste your XML into the input and click "Format" to get properly indented output. Each nesting level adds one level of indentation (configurable). Self-closing tags, processing instructions, and CDATA sections are handled correctly. The formatter preserves the original encoding and attribute ordering. The validation checks for structural correctness: it tracks opening and closing tags, detects mismatched elements, and reports unclosed tags with the tag name. This helps catch common XML errors before they cause issues in parsers, transforms, or downstream processing. Note that validation is structural only — it does not validate against a DTD or XML Schema. All processing happens in your browser. Your data never leaves your device. For related tools, try our [JSON Formatter](/tools/json-formatter) for JSON data or [CSS Formatter](/tools/css-formatter) for stylesheets.
FAQ
Does it validate XML?
It performs structural validation — checking for matching open/close tags and proper nesting. It does not validate against DTD, XSD, or XML Schema definitions.
Does it handle namespaces?
Yes. Namespace prefixes in tag names are treated as part of the tag name. The formatter handles them correctly during indentation and validation.
What about CDATA sections?
CDATA sections are preserved as-is during formatting. They are treated as content blocks and not parsed for tags or entities.