An image processing system, connecting a plurality of image forming apparatuses via a network for outputting an input image using one of image forming apparatuses, includes an output-specifying information obtaining unit that obtains output-specifying information including to-be-output image data and information designating one of the image forming apparatuses as an output destination to output the to-be-output image data; an output-able size information obtaining unit to obtain output-able size information linking information identifying each image forming apparatus and output-able image size information at each image forming apparatus; an output-able size information display unit to display an output-able image size of each image forming apparatuses on a display area; an image data converter to convert image data to a data format suitable for the designated image forming apparatus; and an image data transmission unit to transmit the converted image data to one of the image forming apparatuses designated as the output destination.