Image forming apparatus

An image forming apparatus comprising:

• an image reader unit arranged to read a document placed on a contact glass so as to generate read data including image data of the document;
• and
• a control unit arranged to perform a cropping process of cropping the image data from the read data so as to generate output data of the image data cropped in the cropping process, wherein
• when performing, as the cropping process, a first process in which a plurality of image data are cropped from the read data, the control unit sets one side of the read data to a first reference side and sets another side perpendicular to the first reference side of the read data to a second reference side, and for each of the plurality of image data, the control unit detects a first distance between the first reference side and the image data in a direction parallel to the second reference side, and a second distance between the second reference side and the image data in a direction parallel to the first reference side, and sets an output order of the plurality of image data based on the first distances and the second distances of the plurality of image data.