Is there an auto sizer app for photos?

We will have some members of our photo club who will not know how to resize their photos. I have set a limit on the size of a photo (so we don’t max out our server space) but It would be better if they could upload their photo at whatever resolution they have and know that it will be resized to be uploadable to our site. I thought I remember reading in one of the tickets that IS offered this service? Maybe even in one of my tickets ,.. but I can’t find it now.