XML Formatter & Validator
Format, validate and minify XML instantly — 100% in your browser.
About XML Formatter & Validator
Paste your XML below and it is instantly validated and pretty-printed with consistent indentation. If the XML is malformed, you get the parser's error message and the line it occurred on so you can fix it fast.
Validation uses the browser's native XML parser and the formatter preserves comments, CDATA sections, processing instructions and DOCTYPE declarations. Everything runs locally in your browser — your data is never sent to a server, which makes it safe for API payloads, config files and other sensitive documents.
Format compact XML
<note><to>Tove</to><from>Jani</from><body>Reminder</body></note>
<note> <to>Tove</to> <from>Jani</from> <body>Reminder</body> </note>
Switch the indent selector to 2/4 spaces or tabs, or use Minify to strip whitespace.
Frequently asked questions
Is my XML uploaded to a server?
No. Validation and formatting happen entirely in your browser, so your data never leaves your device.
What does the validator check?
It uses the browser's native XML parser, so it flags any well-formedness errors — unclosed or mismatched tags, stray angle brackets, bad attribute quoting, and so on — with the message and line number.
Does it keep comments and CDATA?
Yes. Comments, CDATA sections, processing instructions and DOCTYPE declarations are preserved; only insignificant whitespace between elements is reflowed.
Can it minify XML too?
Yes. The Minify option removes whitespace between elements to produce a single compact line of valid XML.