Youtube Thumbnail Downloader, Saver and Grabber is a free and easy online tool which allows you to preview and download any Youtube video thumbnail images. It supports High Resolution, Medium Resolution, Low Resolution (4K, HD, HQ, 1080p). You can save Youtube Thumbnail in any Resolution. This free and fast Youtube Thumbnail Grabber allows you to save any YouTube Thumbnail on your mobile, computer, iPhone or nearly any other device for future use.
Thumbnails are compressed-size versions of videos or pictures which is used to help in recognizing and organizing them and serving the exact same role for images as a normal text index does for words
Yes, there are so many applications available on play store. You can use anyone which you like.
No, there is no chrome extension available for saving Youtube Thumbnail Image.
This is because the High Quality Resolution Thumbnails are minimum of 1280 x 720 Pixels and the Youtube Channel Owner of this video has uploaded a Thumbnail lower than that. That's why it did not open. Choose other quality images to download.