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How to use YouTube Thumbnail Image Generator
Step 1 : Go to www.YouTube.com, Search a video.Step 2 : Copy the URL of the video (Example: https://www.youtube.com/watch?v=3nmnMtbzzjE ).
Step 3 : Paste that URL in the box given above and then click the "Get YouTube Thumbnail" button.
Step 4 : Choose your Thumbnail size and Download it.