You can use Image Resizer to create all the app icons you need for your iPhone/iPad, Mac OS X and Android app.
iPhone/iPad and Mac OS X icons are created as a preconfigured Xcode Asset Catalog that you can drag into your project folder. An icon.icns file is also created for Mac OS X icons but it is recommended to use the Asset Catalog instead.
Android icons are placed in subfolders based on their screen density, e.g. drawable-xxhdpi.
Create one large format icon (at least 1024pt), drag it into the Source Image placeholder then save the app icon to create the following size icons;
iPhone/iPad App Icons
• iPad retina (iOS 7 and later) 152pt, e.g. appicon-76@2x.png
• iPad 3 (iOS 6 and prior) 144pt, e.g. appicon-72@2x.png
• iPhone/iPod retina (iOS 7 and later) 120pt, e.g. appicon-60@2x.png
• iPhone/iPod retina (iOS 6 and prior) 114pt, e.g. appicon@2x.png
• iPad non-retina (iOS 7 and later) 76pt, e.g. appicon-76.png
• iPad 1 & 2 (iOS 6 and prior) 72pt, e.g. appicon-72.png
• iPhone/iPod non-retina 57pt, e.g. appicon.png
• iTunes Artwork (iTunesArtwork)
iPhone/iPad Spotlight & Settings
• iPad 3 (iOS 6 and prior) 100pt, e.g. appicon-Small-50@2x.png
• Universal retina (iOS 7 and later) 80pt, e.g. appicon-Small-40@2x.png
• iPhone/iPod retina/iPad 3 (iOS 6 and prior) 58pt, e.g. appicon-Small@2x.png
• iPad 1 & 2 (iOS 6 and prior) 50pt, e.g. appicon-Small-50.png
• Universal non-retina (iOS 7 and later) 40pt, e.g. appicon-Small-40.png
• iPhone/iPod non-retina 29pt, e.g. appicon-Small.png
Mac OS X
• 512pt at 144dpi
• 512pt at 72dpi
• 256pt at 144dpi
• 256pt at 72dpi
• 128pt at 72dpi
• 64pt at 72dpi
• 32pt at 72dpi
• 16pt at 72dpi
Android
• Large app icon 512pt at 72dpi (Google Play Asset)
• 144pt xxhdpi at 480dpi
• 96pt xhdpi at 320dpi
• 72pt hdpi at 240dpi
• 48pt mdpi at 160dpi
• 36pt ldpi at 120dpi.
Screen Shots
QR Utilities enables you to scan and create QR barcodes.