An image forming system includes an input device, an image processing device, an image forming device, a delivery device, and a controller. The controller causes the image processing device to execute RIP operation in forward order with respect to print data, upon receipt, through the input device, of a first instruction indicating one of a combination of reverse order and face-up, and a combination of forward order and face-down, as combination of sorting order and face orientation at delivery of a recording medium having an image formed thereon, and causes the image processing device to execute RIP operation in reverse order with respect to the print data, upon receipt, through the input device, of a second instruction indicating one of a combination of forward order and face-up, and a combination of reverse order and face-down, as the combination of the sorting order and the face orientation at delivery.