An image forming apparatus includes a printer and a controller. The printer transfers an image formed by attaching toner to an electrostatic latent image onto a sheet, heats and presses the sheet onto which the visible image is transferred to fix the image onto the sheet, and thereby forms an image on the sheet. The controller controls the printer to form an image for a second surface, and then to form an image for a first surface which differs from a surface on which the image for the second surface is formed, when the controller determines that duplex printing, in which decolorable toner is used on the first surface on which an image is first formed, and toner having a fixing temperature higher than a decolorizing temperature is used on the second surface, is set in printing job data.