An image forming apparatus comprising: an acceptance section; a prediction section which predicts, based on margin information contained in an instruction for execution of an accepted job, an arrangement pattern of a plurality of sheets to be obtained by the execution; a determination section which determines, based on the margin information, whether or not a sum of respective areas of margin regions of the plurality of sheets is greater than a threshold associated with the predicted arrangement pattern; and an adjusted printing section which downscales, in response to a determination that the sum is greater than the threshold, an overall image consisting of a set of partial images intended to be formed and arranged in the predicted arrangement pattern, in such a manner as to fall within one or more sheets arranged in an altered arrangement pattern, and forms the downscaled image on the one or more sheets.