100% Client-side · Your XML never leaves your browser
Validate & Format XML Online
Check XML syntax with precise error line numbers, pretty-print with 2 or 4-space indentation, or minify for transport. Works offline.
XML Tools
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Validate — check XML syntax and report errors. Cmd+Enter to run
Input 0 chars
Output
Indent
Paste XML and it updates live.
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FAQ
XML Validator — Frequently Asked Questions
Everything you might wonder about our online XML validator and formatter.
What XML errors does the validator detect?
The validator catches well-formedness errors: unclosed tags, mismatched tag names, multiple root elements, unescaped special characters (&, <, >), invalid characters in tag names, malformed attributes, unclosed comments, and unclosed CDATA sections. Each error includes the exact line and column number.
Is this XML formatter free to use?
Yes — the online XML formatter is 100% free, with no signup, no rate limits and no ads. Paste any XML and get validated, formatted output instantly.
Does the XML formatter send my data to a server?
No. All validation and formatting happens in your browser via the native DOMParser API. We have no servers, no logs, and no analytics on your XML — your data never leaves your machine.
What is the difference between Format and Minify?
Format adds indentation and line breaks to make XML readable. Minify strips all whitespace between tags, producing the most compact version — useful for network transport or embedding XML in JSON.
Does it validate against a schema (XSD/DTD)?
The tool validates well-formedness (balanced tags, quoted attributes, valid structure) but not conformance to XSD or DTD schemas. For schema validation, use a dedicated XML schema tool.
Does the XML formatter preserve CDATA and comments?
Yes — CDATA sections and XML comments are preserved exactly. The formatter only adds or removes whitespace between tags; content is untouched.
Does this XML validator work offline?
Yes. After the first page load all assets are cached, so the XML validator works offline in any modern browser — perfect for air-gapped or restricted networks.
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