No, it certainly isn't because if you have a macbook, you have Preview, and if you have Preview, you can adjust the size of an image.
If, for some reason, you don't have Preview, you can probably do it right on the photo-sharing site you'll need to upload an image to to use it as an avatar in most forums. I know photobucket has an edit option, I can't speak for all other sites, but there's bound to be something.
Have you checked out Springfield Showcase sticky "How To Post Images From iDevices"?
There is also a sticky in FAQs And Guides: "How To Post Images, Avatars, and You Tube Videos On The Forum" which I have found very helpful!
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If, for some reason, you don't have Preview, you can probably do it right on the photo-sharing site you'll need to upload an image to to use it as an avatar in most forums. I know photobucket has an edit option, I can't speak for all other sites, but there's bound to be something.
*edit* Glad to see you worked it out.
There is also a sticky in FAQs And Guides: "How To Post Images, Avatars, and You Tube Videos On The Forum" which I have found very helpful!