Url of large image of a YouTube video

Question

I\'m interested in getting a preview image of a youtube video for my application I\'m using the url to the previews:

http://img.youtube.com/vi/EqWRZrupLrI/0.jpg

Answer 1

0.jpg is the full-size 480p thumbnail and there is no bigger thumbnail except for full HD videos (maxresdefault.jpg).

But why do you expect a bigger thumbnail for such a video ? Your video example has a resolution of 240p, the thumbnail is already much bigger than the video resolution.