By and large you can use the generally superior PNG format for screenshot and icon graphics in your PAD file.

However a small number of shareware sites insist on only using GIF format.

Since your aim must be to make your PAD file as trouble free as possible, so as to expediate the shareware submission proceess, we see little option but to strongly recommend that you only use GIF format graphics.

Of course this situation is totally absurd, is there a web browser still in use that does not support PNG files?