YouTube’s video preview images represent to many the ultimate deciding factor as to whether or not to watch a video. If a preview image looks interesting, it can mean the difference between someone pressing the play button. Videos’ preview images can appear lower in quality, and sometimes you don't want a logo in your player. YouTube is rolling out new features for both situations: HD preview images and the option to remove the logo from your player.
HD preview images
Video resolutions have been increasing across YouTube, and the sizes of your embedded players are bigger than ever. But until now, video preview images in today’s larger players haven’t kept up with your high-quality and larger videos.
Any new video uploaded to the site in a resolution of 480p or higher will have an HD preview image wherever the player is embedded.
Many users have asked YouTube for a version of the YouTube player without a YouTube logo, so the video plays without any branding nearby. There is now a simple option to do it. At the end of the video URL in your embed code, just add the code ?modestbranding=1 and the player will show without the YouTube logo in the control bar. Note that a small “YouTube” text label will still show up in the upper-right corner of a paused video when you hover over the player.