iResize is an useful prgoram which will solve those problems. Thanks to iResize you will be able to resize your photos so you will be able to e-mail them with no problem.
The interface is really easy to use, and you will not have any problem to resize your photos, no matter how many they are. You can choose one or a lot. Once we have decided the photos we want to modify, choose the percentage you want to modify to or choose the new dimensions and press ’OK’.
And if you have fileformat problems, it will change it too, so you and your friends will be able to view all your photos.
iResize can convert from/to JPEG, BMP, GIF, PNG and TIFF.