A convertible cover for pontoon boats comprises a fabric or cloth cover attached to a set of runners. The invention utilizes a track system on both sides of the boat with round runners. Sliding supports with three glide wheels each ride along these runners and match with an equal runner on the opposite side of the boat. The runners glide along a track guide system mounted onto the handrails of the pontoon boat. The cover glides along the track when manipulated by the user and enables the user to effectively and quickly cover the pontoon boat during storage or other times of inactivity. To remove the cover, it is simply pushed backwards where all supports and the tarp are stored at the rear. To deploy, it is simply pulled by a strap to completely and automatically cover the whole boat.