QQ avatar can be cut off with any blank picture. For example, the blank space of this page can be cut online. Stealth is all white, simple and not simple. I have used it for many years.

As for what you call "online invisibility", first of all, you surf the Internet yourself → right-click your friend's avatar → set permissions → make it invisible online. You can also set the method of "invisibility is visible to your friends" in the stealth state.