Stretching a photo for apples screen shots?

http_gamesalad

I have an iPod 4 gen and I posted those screen shots for submitting but I need iPhone 4, 6 and also iPad. I don't own any of those devices but I have to put those screen shots... How would I stretch them so it fits for all those different platforms

Thunder_Child

http://m.download.cnet.com/Free-Picture-Resizer/3000-12511_4-10297789.html

CNet is usually a trusted site for shareware that provides certain functions.

BBEnk

if your on a Mac just double click on them to open in preview from there you can change there size and remove the alpha.