No matter what type of Instagram Story ads you plan to run, whether images or videos, the aspect ratio is 9:16, and the recommended resolution is 1080 x 1080 pixels. However, there are differences in design requirements for visual Instagram Story ads and Instagram Story video ads. Regarding visual ads, formats should be either JPG or PNG with a max image size of 30MB, while video ads support MP4 or MOV formats with a max duration of two minutes and a max video size of 4MB.