An image forming system includes an image forming unit configured to form a print image to be printed on a recording medium, based on a raster image and print setting information, a printing unit configured to print an image on the recording medium based on the print image, an image reading unit configured to read the image printed on the recording medium to obtain a read image, and a determination unit configured to determine whether there is an error in the image printed on the recording medium, based on the read image and the raster image. In a case where there is a predetermined difference between the raster image and the read image and the predetermined difference is based on the print setting information, the determination unit does not determine that there is an error in the printed image.