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Video thumbnail preview at feed sizes
Drop a thumbnail image, add the title and see how it looks in the feed on desktop and mobile and at small sizes. The image stays on your device.
Thumbnail preview questions
What size should a YouTube thumbnail be?+
YouTube recommends 16:9 at 3840 x 2160 pixels for videos, with a minimum width of 640 pixels, saved as JPG or PNG. The file can be up to 2 MB when uploaded from mobile and 50 MB from desktop. Shorts use 9:16. Once the thumbnail looks right at small sizes, pick a title with the video title generator.
Does my thumbnail get uploaded?+
No. The browser shows the image from your own device and nothing is sent anywhere. Closing the page clears it.
How does a vertical video's thumbnail show in the feed?+
YouTube replaces a 16:9 custom thumbnail on a vertical video with an auto-generated 4:5 thumbnail on the home, explore and subscription pages. Your custom thumbnail still appears in the watch feed, watch history and on non-mobile platforms. More tools for packaging a video are on the free tools page.
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