How is invalid XML detected?

The browser's native DOMParser reports a parser error, which is shown with a helpful hint.

Can I choose the indent size?

Yes, pick 2 or 4 spaces from the options bar.

Are comments preserved?

Yes, XML comments are kept in the formatted output.

Is my XML uploaded anywhere?

No, parsing and formatting happen entirely locally in your browser.

XML Formatter & Validator

Beautify XML and validate well-formedness using DOMParser.

Works Offline

Privacy First

No Login

No API

Indent size

XML input

Invalid XML

DOMParser is not defined

Check for unclosed tags or mismatched elements.

About the XML Formatter & Validator

Paste XML markup to get a cleanly indented, well-formatted version, or see a precise parser error if the document isn't well-formed. Uses the browser's native DOMParser for accurate validation.

Examples

Compact XML

<root><item>1</item></root>

Output

<root>
  <item>1</item>
</root>

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-11 · Runs entirely in your browser