What size for thumbs?

[Thrashbat]

My thumbs are average sized, and neither are hitchhiker thumbs... Wait, oh, this is about thumbnails... Well, I cut my thumbnails yesterday, so they're pretty small lol

 

[JGhost]

uh...my thumbs are about 5 inches x 1.5 inches...I guess I'm the odd one out

 

[thetiivik]

Oh, haha, I thought you were meaning to make it 160 x 90.

Anyways, I want the image itself to be high quality--not just on the computer screen. 640 x 360 is too small of a canvas to work with for me.

You could work in 1920x1080 and then resize it to 640x360. The aspect ratio is the same.

Well let me help you out here is the best answer and if my other fellow yttalkers said the thumbnail size should be 1280w and 720h also thumbnails cannot be bigger than 2mb

Yep, file size can become an issue, but I have squished a 2560x1440 .png into 1.8mb, looked great.