800x800
"Choose a JPG, non-animated GIF, BMP or PNG file. Non-square images will be cropped. For best results upload an 800 px by 800 px image. Do not upload pictures containing celebrities, nudity, artwork or copyrighted images. Maximum file size is 1 MB."
Bigger than a real thumb nail but smaller than Jimmy Nail
The recommended YouTube thumbnail size is 1280 x 720 pixels and up to 2MB. For best results, upload a video thumbnail with a 16:9 aspect ratio. JPG, GIF, and PNG image files are supported. The minimum size dimensions for YouTube thumbnail images is 640 pixels wide.
Thumbnail pictures on YouTube can be changed by visiting a specific video's "edit" page. You can do this by visiting the Video Manager page and selecting the "edit" button. From there, you should be able to find the edit thumbnail section for the video.
goto: youtubethumbnaildownloaderonline dot com then paste youtube video url on the box and download.
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To be able to use the custom thumbnail option on YouTube, your account must be in good standing. Also, you may have to be a YouTube partner to be able to enable the feature (but this might change in the future). Also make sure that your YouTube video has finished uploading and processing to make sure that the thumbnails for your video were uploaded and saved correctly.
You need to be verified to post thumbnails on your videos. All you have to do is go to the features area on YouTube, and click the Verify icon.
You need to enable custom thumbnails to upload your own thumbnail image for a video. Custom thumbnails is a feature available to verified accounts in good standing.
Make sure that you've hit the "Publish" or "Save" button and let everything load through. Your video's thumbnail should then promptly switch to your updated one.
Poison Dart Frogs are about the size of your thumbnail
When uploading it should give you an option of what you want your thumbnail to be. It usually gives you a choice of about 4 views of the video.
A small version of a large graphic on a web page is often called a thumbnail. Many designers use them to put more on a single page and make it easier to browse.
on of thumbnail in MS word