An image forming apparatus includes an image forming device that forms an image on a recording sheet, a storage box for storing a printed material obtained by the image forming device forming the image on the recording sheet, a shredding device that shreds the printed material stored in the storage box, a controller that controls the shredding device so as to shred the printed material, upon deciding that a predetermined first standby time has elapsed after the printed material was stored in the storage box, and a communication device that performs wireless communication with a mobile device carried by a user. The controller transmits warning information to the effect that the printed material is about to be shredded, to the mobile device, upon deciding that a predetermined second standby time, shorter than the first standby time, has elapsed after the printed material was stored in the storage box.

An image forming apparatus includes an image forming device that forms an image on a recording sheet, a storage box for storing a printed material obtained by the image forming device forming the image on the recording sheet, a shredding device that shreds the printed material stored in the storage box, a controller that controls the shredding device so as to shred the printed material, upon deciding that a predetermined first standby time has elapsed after the printed material was stored in the storage box, and a communication device that performs wireless communication with a mobile device carried by a user. The controller transmits warning information to the effect that the printed material is about to be shredded, to the mobile device, upon deciding that a predetermined second standby time, shorter than the first standby time, has elapsed after the printed material was stored in the storage box.

An image forming system includes: an image forming apparatus that forms an image on a recording medium; a relay transporter that transports the recording medium on which the image is formed by the image forming apparatus; a post-processing apparatus including a collecting container that collects a recording medium, the post-processing apparatus performing post-processing on the recording medium transported by the relay transporter; and at least one processor configured to stop transport of a recording medium when a paper jam occurs in the post-processing apparatus and, if a remaining recording medium is present in the relay transporter when the paper jam is cleared and the transport of the recording medium is restarted, cause the remaining recording medium to be collected by the collecting container.