Download the YouTube thumbnail in 640 × 480
640 × 480 is the sddefault size: a 4:3 frame, so YouTube crops the sides off the original thumbnail. Useful when you need a mid-size image and the crop does not matter, or when an older video has no max resolution.
YouTube is a trademark of Google; CreativeStar is not affiliated with Google. Thumbnails belong to their creators: use them as reference or with permission.