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XML Validator.

Check that XML is well-formed and validate it against a DTD or an XSD schema.

Tip: Ctrl + Enter starts the check. HTML without <html> or <title> is checked as a page fragment.

File

The public file is downloaded once (max 2 MB, up to 5 redirects). Local and private network addresses are blocked.

XML Schema (XSD) — optional

Ready.

The code is checked in memory only and is never stored or logged. The checks follow the HTML Living Standard, CSS and XML specifications and cover the most common errors, but they are not a complete replacement for the official W3C validators.