IconUtility resizes an image into the following iPhone/iPad related icon sizes¹:

• Icon.png – 57×57 pixels application icon for standard resolution iPhone
• Icon@2x.png – 114×114 pixels application icon for high resolution iPhone 4
• Icon-72.png – 72×72 pixels application icon for iPad
• Icon-Small.png – 29×29 pixels settings icon for standard resolution iPhone
• Icon-Small@2x.png – 58×58 pixels settings icon for high resolution iPhone
• Icon-Small-50.png – 50×50 pixels settings icon for iPad

To use it, simply drag and drop an image onto the app, then save images. IconUtility creates a folder onto your desktop that contains appropriate images. You can download the app and check its source at:

• http://github.com/borealkiss/IconUtility
• http://github.com/borealkiss/IconUtility/downloads

Footnotes

1. icon size description from Updating for the iPhone 4 retinal display – Blog – Use Your Loaf [↩]