@firegoby id love to see your finished code if you don’t mind sharing it? I was thinking about it and giving the user control over the crop is better than square cropping it anyway, and i was have issues with getting the progress bar to work…
All it needs now is a droppable interface!
Edit: meant to say great job by the way, the video sold me on it! 
and yea it’s a lovely technique doing it all client side.