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Free Developer Tool

XML Formatter and Validator

Paste XML to validate its structure with real parser error messages, pretty-print it with clean indentation, or minify it.

100% Free No signup Runs in your browser No uploads

Frequently asked questions

How does the validator work?

Your XML is parsed by your browser’s real built-in XML parser (the same engine behind DOMParser). If the XML is broken, the exact error message from the parser is shown, including what went wrong, nothing is guessed or made up.

What counts as invalid XML?

Common problems are unclosed tags, mismatched tag names, unescaped ampersands or angle brackets in text, bad nesting, and multiple root elements. The validator reports the first error the parser hits.

Does the formatter change my data?

Pretty-printing only changes whitespace between elements. Text content, attributes, comments and CDATA sections are preserved exactly. Minify mode removes the whitespace again without touching the data.

Preview

XML Formatter and Validator tool preview
Live preview of the XML Formatter and Validator tool running in your browser. Your data never leaves your device.

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