Provided is an image forming apparatus including: an acquisition unit that acquires size information regarding a sheet on which an image is to be formed and print data; an image forming unit that forms the image on the sheet on the basis of the print data acquired by the acquisition unit; and a control unit that, if the size information acquired by the acquisition unit indicates a first size of which an aspect ratio of the sheet is 1:substantially 1.41, exchanges vertical and horizontal directions of the image formed on the sheet with respect to the print data by controlling the image forming unit so as to execute a first split print mode of enlarging the image to be printed on two sheets.