YouTube service can be used after payment to YouTube Premium users. In this service, users can watch videos without ads. In addition users can download the video.
Previously, YouTube Premium user could only download high resolution video at up to 720p resolution, even if the original video resolution was higher.
YouTube has now introduced the feature for premium users to download videos in 1080p resolution. This feature allows users to download high resolution videos and watch them offline. First of all, this feature was released for iPhone users, and was later confirmed by Android users.
YouTube has not yet confirmed whether the feature is in experimental stages or has been released to all premium user.