<note priority="high"> <to>Ada</to> <from>Anvil</from> <body>Ship it!</body> </note>
About XML Formatter, Validator & Minifier Online
XML still powers config files, SOAP responses, RSS feeds, SVG markup, and countless data exchanges — but it usually arrives as one unreadable line or buried in a log. This free XML formatter pretty-prints, validates, and minifies XML so you can actually read it, diff it, or ship it.
Beautify expands nested elements with the indent you choose (2 spaces, 4 spaces, or a tab) while keeping attributes, namespaces, comments, and CDATA exactly as they were. Minify strips the whitespace between tags to shrink payloads without touching CDATA content. When the markup is malformed, the validator points at the mismatched or unclosed tag and the line where it went wrong.
Everything runs locally in your browser — your XML is never uploaded, which matters when it carries credentials, internal endpoints, or customer data.
Features
- Beautify (pretty-print) or minify XML in one click
- Choose 2-space, 4-space, or tab indentation
- Preserves attributes, namespaces, comments, and CDATA
- Validates and reports the line of malformed markup
- Fully offline — nothing leaves your device
How to use
- Paste your XML into the input pane.
- Pick Beautify or Minify, and choose an indent size for beautifying.
- Check the validation status — any error is flagged with its line number.
- Copy the formatted XML from the output pane.
Frequently asked questions
Does it preserve attributes, namespaces, and CDATA?
Yes. The formatter parses the full document and round-trips attributes, namespace prefixes, comments, and CDATA sections unchanged. Minifying removes whitespace between tags but never alters CDATA content.
What does minifying XML do?
It removes the insignificant whitespace and newlines between elements, producing the smallest equivalent XML. This is handy for reducing payload size in API requests or embedding markup in code.
How does it handle invalid XML?
It validates as it parses. If a tag is mismatched, unclosed, or the document is otherwise malformed, it shows a clear error message with the line number where the parser found the problem instead of producing broken output.
Is my XML sent to a server?
No. Parsing, formatting, and validation all happen in your browser. Your XML never leaves your device, so it is safe to paste documents that contain sensitive data.
Related tools
Everything runs locally in your browser — your input is never uploaded.