When the ‘Auto-size Media’ feature (File > ARTS PDF Crackerjack X > ARTS PDF Crackerjack X > Media) is checked, ARTS PDF Crackerjack X will automatically set a media size which matches the current PDF page size plus any extra amounts specified by the ‘Border’ parameter. Checking this box causes the list of media sizes in the Media box to become disabled. If a multi-page PDF document contains different page sizes and/or orientations, ARTS PDF Crackerjack X will adjust the media size for each page during output. This feature is particularly useful when ARTS PDF Crackerjack X Pilot is used, since you need not create multiple pilot folders to accommodate different media sizes.