Polydialdehyde starch is widely used in the paper industry as a wet-strength additive, enhancing the durability of paper products when exposed to moisture. It is also employed in the textile industry for fabric finishing, providing improved crease resistance and dimensional stability. In biomedical applications, it serves as a crosslinking agent for proteins and other biomolecules, making it useful in drug delivery systems and tissue engineering. Additionally, it is utilized in water treatment processes as a flocculant to aid in the removal of suspended particles and impurities. Its biodegradable nature makes it an environmentally friendly choice in various industrial applications.