An image forming apparatus of an embodiment includes a heating unit, first and second keeping units, and first and second transport units. The heating unit heats an image formed on a sheet. The first and second keeping units keep sheets. The first transport unit transports the sheet from the first keeping unit to the heating unit to form an image. The second transport unit transports the sheet from the second keeping unit to the heating unit by a transport distance shorter than a sheet transport distance of the first transport unit to erase the image.