Each YouTube video has 4 generated images. They are predictably formatted as follows: http : //img.youtube.com/vi/ ID BURAYA /0.jpg http : //img.youtube.com/vi/ ID BURAYA /1.jpg http : //img.youtube.com/vi/ ID BURAYA /2.jpg http : //img.youtube.com/vi/ ID BURAYA /3.jpg The first one in the list is a full size image and others are thumbnail images. The default thumbnail image (ie. one of 1.jpg , 2.jpg , 3.jpg ) is: http : //img.youtube.com/vi/ ID BURAYA /default.jpg For the high quality version of the thumbnail use a url similar to this: http : //img.youtube.com/vi/ ID BURAYA /hqdefault.jpg There is also a medium quality version of the thumbnail, using a url similar to the HQ: http : //img.youtube.com/vi/ ID BURAYA /mqdefault.jpg For the standard definition version of the thumbnail, use a url similar to this: http : //img.youtube.com/vi/ ID BURAYA /sddefault.jpg For the maximum resolution version of the thumbnail use a url similar to this: http : //...