A poster printing method divides a large format poster image into a plurality of image sections and prints them on individual sheets of paper, where some or all of the sheets are perforated sheets with perforation lines along the edges. Unavoidable white margins on the printed sheets can be removed by tearing off strips of the sheet along the perforation lines. The distance of the perforated lines from the edge is determined by a minimum white margin value and a maximum image shift error value for a typical small printer. In addition, the image sections are overprinted, i.e., the image printed on each individual sheet contains an overprinted area around the image section to ensure image overlap of neighboring sheets. The individual sheets are assembled into a poster by removing the perforated portions of some sheets and aligning images on neighboring sheets along the perforation lines.