Can be Validator used as conversion from XHTML to HTML5?

[toplisek]

Can be Validator used as conversion from XHTML to HTML5 or there is better way?

[Albert Wiersch]

You can always use the validator part of CSE HTML Validator to check the conversion, but not to actually do the conversion.

One option might be to check the document using CSE HTML Validator's support for polyglot. Such documents can be served as XML or plain HTML5. More information is here:
http://www.htmlvalidator.com/htmlval/v1 ... l_node.htm

Another option is to try the Pretty Print & Fix (HTML Tidy) tool and force the output to 'html' and the doctype to 'html5'. Of course you'll need to check that the converted documents still work as you want and that they weren't changed in a way that breaks something.

I hope this helps.