How to adjust the pixel of Nikon D90 camera to 800*800? I am used for Taobao shooting.

Need to use image processing software, such as photoshop, or simply a light and shadow magician.

An easier way is to look at it with the ruler under the QQ screenshot tool. It can be pulled to 800*800, but you must have a large screen. The screen height of an ordinary notebook is at most 768.

So if you want a good picture on Taobao, I suggest that you either ask someone to deal with it or learn to deal with it yourself. Leave your email address, and I'll give you a later tutorial on Taobao commodity photography.