How to remove margins on cover page of pdf

If compiling as a pdf is it possible to remove all the margins on the cover page only so that cover image extends over whole page?

No, margins set in compile will apply to the whole document. For this you’re better off printing a high-resolution image separately, then adding it to the compiled PDF (Acrobat can do this, but the free Foxit Reader might be able to also, if you haven’t got that) or compiling to another format, then adding your image and saving the whole thing to a PDF post-compile.