An image forming apparatus includes an encryption processing unit, a storage unit, a decryption processing unit, a decryption processing unit, and an image output unit. The encryption processing unit encrypts non-compressed image data that is not compressed and indicates a raw image as a target of the forming to generate encrypted image data. The storage unit stores the generated encrypted image data. The decryption processing unit decrypts the stored encrypted image data to restore the non-compressed image data. The image output unit forms the print image on the print medium using the non-compressed image data to output a printed matter. The image forming apparatus regards and processes the encrypted image data as the non-compressed image data to generate encryption confirmation image data indicating an encryption confirmation image, so as to associate and then display the encryption confirmation image with the printed matter using the encryption confirmation image data.