An image forming apparatus includes an exposure head including light emitting elements arranged in an intersecting direction intersecting with a rotation direction of a photosensitive member to form an image at a first resolution corresponding the light emitting elements in the intersecting direction; a data generating unit configured to generate pixel data corresponding to a second resolution higher than the first resolution associating with positions of the pixel data; a correction unit configured to correct associations between the positions and the pixel data to adjust a position of an image in the intersecting direction; a conversion unit configured to convert the pixel data corresponding to the second resolution to pixel data corresponding to the first resolution; and a drive unit configured to drive the light emitting elements based on the pixel data corresponding to the first resolution.