How to download youtube thumbnail?

You can choose from three methods to download YouTube thumbnail:

1. Replace "youtube.com" with "http://downloadthumbnail.com" to download youtube thumbnail.
   For example: http://www.youtube.com/watch?v=7mEeqs_zXwo
   would turn to: http://downloadthumbnail.com/watch?v=vKYm794Twck
2. Copy the URL of the YouTube video thumbnails which would you like to download
   put the URL of the YouTube video into the input and then press the "Show the thumbnail" button.
3. Copy the ID of the video thumbnails which would you like to download and put the ID of the YouTube video into the input and then press the "Show the thumbnail" button.
   Example: the URL of the video is http://www.youtube.com/watch?v=7mEeqs_zXwo
   the video ID is 7mEeqs_zXwo;

When the page is loaded make a right click on the one of the nine different picture and choose Save image as... it's so easy :)