iConvert is a simple yet very helpful tool let you generate all icons sizes for iOS App in a single click, simply drop your source icon over the drop zone, select between rounded or flat corners then click export. iConvert will generate 5 icons named : icon1024.png for iTunes Connect Artwork. icon144.png for iPad retina. icon114.png for iPhone/iPod retina. icon72.png for iPad. icon 57 for iPhone/iPod.