Hi Nick
Lulu converted it for me from a Word doc, with no trouble. I also make up my own covers and send them up and Lulu converts them. But otherwise you can create your own PDF version, just making sure the sizes are correct. Creata Space (Amazon) that I am now trying out at is much more picky with covers, it's as if they are rejecting nearly everything so you feel obliged to pay them to do your covers etc. I'm persevering though, it's a learning curve and we want it to be right.