When a user upload an image (from an individual or business account), the image that it is uploaded if it have the width and height smaller then 700 pixels, the image won't be resized and stays how it is, but if the width or height is bigger then 700 pixels, example the height is 900 pixels and the width is 1000 pixels, as the width is bigger then the height, the width will be resized to 700 pixels and the height will be resized depending the width to keep the image in good proportion and same ratio. Please note that the original file should be resized so I can gain some more space.