IKImageSizeKit

ImageSizeKit

Image size guides and upload checkers for creators.

Local checksOfficial sourcesNo image upload
Open YouTube thumbnail checkerAbout ImageSizeKit

ImageSizeKit is not affiliated with YouTube or Google. We cite official sources, show last-checked dates, and keep tools simple.

First tool

YouTube Thumbnail Size

Check official dimensions, 16:9 ratio, file limits, and upload readiness before publishing a custom thumbnail.

3840 x 216016:9