An image forming apparatus includes a drawing process controller and a hardware processor useable for drawing processes. In a first drawing process, print data including main image data input-able to the image forming apparatus is processed to convert the main image data to output-able data of the image forming apparatus based on an image drawing command. The hardware processor conducts a second drawing process for pre-set image data settable to the image forming apparatus and expressed in an output-able data format output-able by the image forming apparatus, based on an image drawing command, to prepare the pre-set image data as output-able data of the image forming apparatus, and further combines the main image data expressed as the output-able data and the pre-set image expressed as the output-able data as an output image.