How to use YouTube Thumbnail Downloader / Generator
Step 1 : Go to YouTube.com . Search a video.
Step 2 : Copy the URL of desired video (Example: https://www.youtube.com/watch?v=Gv_XBMrPvRw ).
Step 3 : Paste that URL in the box given above and then click the "Generate Thumbnail" button.
Step 4 : That's all. Just right click the desired thumbnail and save it.