To provide an image processor capable of filing a plurality of images read from a document of a plurality of pages by a reading device in a proper file format in each image, and preventing file management from being complicated.

An MFP includes a scanner for reading an image from a document, output format determination means for determining a file format for outputting an image in each image on the basis of components of the image read by the scanner (S102), image file creation means for creating an image file being a file of images in the file format determined by the output format determination means (S103), and PDF file creation means for creating a PDF file including a plurality of image files created for the document of the plurality of pages by the image file creation means as an attachment file (S109).