If you have channel on YouTube with decent views, it is great idea to update your channel cover photo on YouTube to wish your viewers a very happy New Year 2018. YT is the biggest videos broadcast site works under Google umbrella that help you to reach out people around world in the form of videos. As other popular sites, YT also allows you to display timeline cover and a profile picture on your channel pages. Obviously it is great idea to wish New Year 2018 to all YouTube Channel subscribers and viewers who will land on your channel page during holiday period. These images are perfect for your biggest timeline because the size of YouTube cover picture is very high resolution that is 2120px by 1192px. I hope your search ends here. Cheers.