Question 1

What size should a YouTube thumbnail be?

Accepted Answer

1280 x 720 pixels (16:9), at least 640 wide, under 2 MB, as JPG, PNG or GIF. This makes exactly that.

Question 2

Will it lose quality?

Accepted Answer

It keeps the highest JPG quality that still fits under 2 MB.

Question 3

Want a thumbnail made for you?

Accepted Answer

Toonyx Thumbnails designs one from your video title, with the person your video is about in it.

Resize a thumbnail for YouTube