An image processing device is configured to detect allocation areas from template data, specify a position of each detected allocation area on the template data with respect to a first standard, provide an area identification to each allocation area based on the specified position of each allocation area, acquire image data based on document sheets set thereon, extract document images from the acquired image data, specify a location of each extracted document image on the acquired image data with respect to a second standard, provide an image identification to each document image based on the specified location of each document image, identify an allocation area corresponding to each document image based on the image identifications and the area identifications, edit each document image to be allocated in the corresponding allocation area, generate composite data with the edited document images allocated in the respective allocation areas, and output the composite data.