Download free youtube videos thumbnail in Full HD (1080), HD (720), SD, and also in small size. K4 Tube provide people a Simple Way to download and use YouTube Video Thumbnails from any Video on YouTube and all you need is the URL of the Video.
You can download the Thumbnails in Three Different Qualities, they are:
How to grab and download a YouTube thumbnail preview image:
High Quality Thumbnails won't open, what to do?
- That's because the High Quality Thumbnails are minimum of 1280 x 720 Pixels and if the Channel Owner has uploaded a Thumbnail lower than that, it won't work. Choose the Medium Quality or low.