An image forming apparatus is provided. The image forming apparatus includes a conveyer system, a liquid discharge head with a plurality of nozzles arranged in rows in different positions from one another with reference to a conveying direction at least within a part, a transmitter unit to transmit the image-forming data to the liquid discharge head, a receiver unit to receive the image-forming data, an image-forming data storage unit to store the image-forming data, an error detecting unit to detect a transmission error in the image-forming data, and a controller unit to manipulate the transmitter unit, the liquid discharge head, and the conveying system. The image-forming data with the transmission error detected therein for forming dots in pixel areas in liquid discharged from the nozzles, which are arranged in one of the rows closer to an upstream position with reference to the conveying direction, is transmitted preferentially.