An image processing apparatus includes a processor configured to: acquire a read image of a document that is read by a document reading apparatus; and control an image output device such that the read image and an additional image are outputted to a medium with a significance portion and the additional image prevented from overlapping, and a length of the medium in a sub scanning direction is increased in a case where the significance portion of the read image and a specified region of the read image to which the additional image is decided to be added overlap.