An image forming device includes an input unit to which image data are input, an image processing unit that performs image processing and generates output data, and an output unit that executes a job on the basis of the output data. The image processing unit, in a vertical width compaction process, recognizes a field enclosed by borders; determines whether the recognized field is a vertical width compaction candidate field; sets a vertical omission band in such a way as to include the blank and part of the border of the vertical width compaction candidate field, without eliminating information; eliminates the vertical omission band of the image data; and shifts and compacts the image data below the vertical omission band in the upward direction.

An image forming device includes an input unit to which image data are input, an image processing unit that performs image processing and generates output data, and an output unit that executes a job on the basis of the output data. The image processing unit, in a vertical width compaction process, recognizes a field enclosed by borders; determines whether the recognized field is a vertical width compaction candidate field; sets a vertical omission band in such a way as to include the blank and part of the border of the vertical width compaction candidate field, without eliminating information; eliminates the vertical omission band of the image data; and shifts and compacts the image data below the vertical omission band in the upward direction.

Perform printing by a printing portion onto the printing paper sheet after collating a content of a code optically or electromagnetically read by a reading device connected to a printer main body and a content of printing data supplied from a memory connected to this printer main body.