How to get HQ youtube thumbnails?

http://img.youtube.com/vi/<insert-youtube-video-id-here>/0.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/1.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/2.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/3.jpg

That works for small thumbnails.

http://img.youtube.com/vi/<insert-youtube-video-id-here>/mqdefault.jpg

That works for HQ but only 1 image. Question is how to get 4 HQ thumbnail images?

Are you referring to the full resolution one?:

https://img.youtube.com/vi/<insert-youtube-video-id-here>/maxresdefault.jpg

I don't believe you can get 'multiple' images of HQ because the one you have is the one.

Check the following answer out for more information on the URLs: https://stackoverflow.com/questions/2068344/how-to-get-thumbnail-of-youtube-video-link-using-youtube-api

> For live videos use https://img.youtube.com/vi/<insert-youtube-video-id-here>/maxresdefault_live.jpg > > - cornips

YouTube resolutions and images

http://img.youtube.com/vi/<video-id>/<resolution><image>.jpg

Resolution

• lowest resolution
  sd - Standard Definition
  mq - Medium Quality
  hq - High Quality
  maxres - MAXimum RESolution
  
  Image
  default - Default image (1, 2, 3 shot from video, or custom uploaded)
  1 - First shot from video
  2 - Second shot from video
  3 - Third shot from video
  

You can simply get HQ youtube thumbnails..

http://img.youtube.com/vi/YOUTUBE_VIDEO_ID/hqdefault.jpg

Depending on the resolution you need, you can use a different URL:

Default Thumbnail

http://img.youtube.com/vi/<insert-youtube-video-id-here>/default.jpg

High Quality Thumbnail

http://img.youtube.com/vi/<insert-youtube-video-id-here>/hqdefault.jpg

Medium Quality

http://img.youtube.com/vi/<insert-youtube-video-id-here>/mqdefault.jpg

Standard Definition

http://img.youtube.com/vi/<insert-youtube-video-id-here>/sddefault.jpg

Maximum Resolution

http://img.youtube.com/vi/<insert-youtube-video-id-here>/maxresdefault.jpg

Note: it's a work-around if you don't want to use the YouTube Data API. Furthermore not all videos have the thumbnail images set, so the above method doesn’t work.

You need to get id from:

> youtube.com/watch?v=VIDEO_ID

And put it in:

> i.ytimg.com/vi/VIDEO_ID/maxresdefault.jpg

I hope that I helped :D