An image forming apparatus includes: a transferer that transfers a toner image on an image carrier formed by an image former onto a paper sheet; a fixer that heats and thereby fixes the toner image on the paper sheet; a read image acquisitor that acquires read image data of the paper sheet on a downstream side of the fixer in a conveyance direction, the read image data being generated by a reader that reads an image of the paper sheet; and a hardware processor that: controls a conveyance speed of the paper sheet in the transferer and/or the fixer, and changes or updates the conveyance speed based on an image of the acquired read image data.