Easily Annotate Videos. VideoAnt is a web-based video annotation tool for mobile and desktop devices. Use VideoAnt to add annotations, or comments, to web-hosted videos. To have others annotate the video with you, send them the VideoANT link. You are the only person that has to have a VideoANT account. Your collaborators do not need to have a VideoANT account to participate in the annotation process with you.