Abstract: A robotic-based system and method for transposing glass sheets of mixed sizes, including jumbo-sized sheets, from or onto a conveyor onto or from unloading platforms positioned on either side of the conveyor. The system comprises two parallel bridges extending across and above the conveyor and a pair of industrial robots movably mounted each on one of said two bridges for allowing traverse movement of the robots along the bridges such that the robots are having equal reach to both sides of the conveyor. The robots may be operated either in a full synchronized mode for handling sheets too large or to heavy to be handled by a single robot or in an individual operation mode where each robot handles a single sheet.