Is it possible to change a YouTube video thumbnail? The thumbnail is a still frame that represents your video. When you upload a video to YouTube, it generates 3 still images from the video to be used as thumbnails, interesting enough the default image appears to be the second still.
You can use this tool to check the available thumbnails to any video.
Changing the thumbnail
You can only edit your own videos and only use the thumbnails generated by Youtube. To change a video thumbnail follow these steps.
1 – go to http://www.youtube.com/my_videos and login to your account
2 – Select “edit” on the desired video
3 – On the following page, under, “Video Thumbnail”, click on the thumbnail you wish to use. Once you’ve chosen your preferred still, the border around it will become highlighted.
4 – Then click on “Update Video”
It may take a few minutes for the change to show, you may want to refresh your browser cache if the thumbnail does not appear.