Example thumbnail image from YouTube
For thumbnails on the Synn Studios Inc. Synnema Video Portal I needed an easy way to grab a high-quality copy of the video thumbnails used for our videos on YouTube. Thankfully, YouTube provides easy access to the thumbnails for your videos.
It’s simple: Paste this URL in your browser and replace “VIDEO-ID” with the video ID of your YouTube video. Save the image and you’re ready to rock!
Use this URL: http://img.youtube.com/vi/VIDEO-ID/0.jpg