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https://support.google.com/youtube/bin/answe...63305&ctx=topic

You can now upload your custom video thumbnail directly in the upload interface, or choose from one of the three pre-selected thumbnails. The option to choose or upload a thumbnail will only become available at the end of the video processing stage.

Your custom thumbnail image should be as large as possible, as the image will also be used as the preview image in the embedded player. We recommend a resolution of 1280x720, in image formats such as .JPG, .GIF, .BMP, or .PNG. View our custom thumbnail guidelines for more specific recommendations (https://support.google.com/youtube/bin/answer.py?&answer=138008).

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