>A full screenshot is huge. Over 7 million pixels on a typical screen.

Hmmm i don't think that's true? 1080p is 2M, 2K is 4M, 4K is 8M. Are we really in an era where full 4K is "typical"? For reading Instagram? I've got 4 screens i use on a daily basis that are all 2K or less. I mean my TV was only 1080p until a few months ago lol. Maybe I'm just slow.

Also: you're automating the browser, just make the window smaller then!