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This perfect thumbnail size is 1280 × 720 pixels with the lowest width of 640 pixels, and this perfect proportion for YouTube players and previews is 16:9. Together with the exact size, you’ll also need to keep in mind the proportion, file size, and record form of the thumbnail. Below is a handy guide you will write as you make the thumbnail for the picture.

YouTube Thumbnail Size, Feb 18 2020 on