An image forming apparatus configured to: decide a conveying distance for a conveying processing based on image data stored in a memory; and shorten, in a case where it is determined that a code image is to be formed by a plurality of scanning processing including a first scanning processing and a second scanning processing, the decided conveying distance for: (i) one conveying processing which is executed immediately before the first scanning processing; or (ii) at least one of a plurality of conveying processing which are respectively executed immediately before each of a plurality of scanning processing which includes the first scanning processing and at least one scanning processing executed before the first scanning processing, so that the code image is not to be formed in the first scanning processing and the code image is started to be formed from the second scanning processing.