I've wanted to do this for a long time, but I didn't know what it was called or how to do it. Just put any number for the seed, and you can move the mouse to the top to change the quality. (Move way down to see how it works)
Inspired by https://scratch.mit.edu/projects/477914289 this is basically the same thing but I made it have a seed system and automatically resize to the size of the stage (if you change it on TurboWarp). The seed for the thumbnail is 12