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You can get different size and qualities of YouTube video thumbnails using urls.

Player Thumbnail 480×360 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/0.jpg

Start Thumbnail – 120×90 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/1.jpg

Middle Thumbnail – 120×90 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/2.jpg

End Thumbnail – 120×90 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/3.jpg

Use below url to get the Default YouTube video thumbnail – 120×90 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/default.jpg

Use below url to get the high quality YouTube thumbnail – 480×360 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/hqdefault.jpg

Use below url to get the medium quality YouTube thumbnail – 320×180 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/mqdefault.jpg

Use below url to get the standard definition YouTube thumbnail – 640×480 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/sddefault.jpg

Use below url to get the maximum resolution YouTube thumbnail – 1920×1080 pixels

http://img.youtube.com/vi/8gD_9WPPFb4/maxresdefault.jpg

For secture connection Just change http to https in any of the above urls. You can also use i3.ytimg.com instead of img.youtube.com in the example urls above.