Can I convert a landscape-format book to a square format once I've created it?

Square books cannot be converted to landscape, or vice versa. If you created your book in square format, it can be ordered in any square size available for that book style (8x8, 12x12) but not in 11x9, 8x6 or 14x11. In order to create the same book in a different format, a new project will have to be created.