The present invention provides a printing without margins-enabled image forming apparatus that forms toner image matched to the size and position of the conveyed printing material and suppresses waste toner generation. To accomplish this, the present image forming apparatus includes a printing material detection unit that detects orthogonal direction length, conveying direction length, orthogonal direction position, and conveying direction position associated with the conveyed printing material when a printing without margins is selected by the selection unit. In addition, the present image forming apparatus includes a matching unit which, based on the detected length and conveying position, matches the size of the toner image formed on the printing material to the size of the printing material and matches the formation position of the toner image to the position of the printing material conveyed along the conveying path.