To make a 1080p YouTube video, go to the Video settings menu of Bandicam, click the 'Settings' button, select the "Fit Height" option at the video size and enter "1080."
You can simply choose the "YouTube (1080p)" preset like below.
If you're experiencing lag issues with 1080p/720p videos, please visit here.
Upload videos to YouTube from Bandicam
YouTube is the biggest, most well-known and most widely used video sharing site in the world.