TRichView.com

I know I can use SaveHTML to export everything in the TRichViewEdit to HTML.

I want exactly the same thing but with the selected text only. Is there a way to do this ?

I could create a second RichView and Copy/Paste the selected text in the other one and call SaveHTML. But I don't want to use the user clipboard to do it.

TRichView does not have methods for saving selection as HTML.
You need to copy selection to the second TRichView and save it.
It's not necessary to use clipboard - save the selection to TMemoryStream using SaveRVFToStream(Stream, True), and load it using LoadRVFFromStream.