To make a fill pattern a random pattern, thereby to provide an image forming apparatus which is low cost, and easily drops reading properties, and to provide an image forming method, a program, and a recording medium.

When setting of purport for performing a filling processing is made by a disposal document filling mode designating means which sets whether to form an image pattern of filling to a disposal document so that a disposal document which is paper fed substantially become illegible, an irregular fill pattern is formed according to a parameter designated by a painting out parameter setting means which designates various parameters of a fill pattern, a painting out strength or the like required for a filling processing, and the generated fill pattern is image-formed on a disposal document by an image making member, and thereby a disposal document is substantially made illegible.