A print-image forming apparatus which forms a print image for printing on a print sheet a two-dimensional code whose size is defined based on an error correction rate, the apparatus including: a storage device which stores a plurality of levels of error correction rates; a setting device which sets an arbitrary error correction rate from among the plurality of error correction rates; an image forming device which forms the print image based on the error correction rate thus set; a determining device which determines whether or not the formed print image lies off a code printing area of the print sheet where the two-dimensional code is printed; and a setting changing device which changes the setting of the error correction rate such that the print image can lie in the code printing area when it is determined that the print image lies off the code printing area.