Free XML Formatter & Validator Tool Online
Beautify, validate, and indent XML with instant syntax error detection. Ideal for editing, debugging, and improving XML readability.
IN: Raw XML · OUT: Formatted XML · RUNS: 100% in your browser
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Frequently asked questions
Does this tool validate XML syntax?+
Yes, it uses the browser's built-in DOMParser to attempt parsing your XML; if the document is malformed, the parser error is shown instead of formatted output.
Does it validate against an XML Schema (XSD) or DTD?+
No, it only checks that the XML is well-formed (properly nested tags, valid syntax), not that it conforms to a specific schema definition. Schema validation would need a dedicated XSD validator.
Will formatting change my XML's data?+
No, formatting only adjusts whitespace and indentation between tags for readability — element names, attributes, and text content remain exactly as you provided them.
Can I format XML with namespaces?+
Yes, namespaced elements and attributes (like xmlns: prefixes) are preserved and formatted normally, since they're valid XML syntax handled by the parser.
Is my XML content sent to a server?+
No, parsing and formatting both run entirely in your browser using native DOMParser and JavaScript string operations.
Can this handle very large XML files?+
It works well for typical config and data files up to a few megabytes; extremely large XML documents (tens of MB) may be slow to format in the browser.