How to use YouTube Thumbnail Generator / Downloader
Step 1 : Go to YouTube.com . Search a video.Step 2 : Copy the URL of desired video (Example: https://www.youtube.com/watch?v=n_HCauC1Ytk ).
Step 3 : Paste that URL in the box given on Home Page and then click the "Fetch Thumbnails" button.
Step 4 : That's all. Just right click the desired thumbnail and save it.