Start Thumbnail (120x90p)

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Middle Thumbnail (120x90p)

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End Thumbnail (120x90p)

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Normal Quality Thumbnail (120x90p)

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Medium Quality Thumbnail (320x180p)

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High Quality Thumbnail (480x360p)

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Player Background Thumbnail (480x360p)

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Standard Definition Thumbnail (640x480p)

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Maximum Resolution Thumbnail (1280x720p / 1920x1080p)

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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.