What is the ideal YouTube thumbnail size for high-quality uploads?

[AngieMacal]

I want to make sure I’m using the correct YouTube thumbnail size for my videos. Can someone confirm the recommended dimensions and file requirements so the thumbnail displays properly?

 

[simran]

The ideal YouTube thumbnail size is 1280 × 720 pixels (16:9 ratio), with a minimum width of 640 px and under 2 MB, in JPG, PNG, or GIF format.