Carboxylated cellulose nanofibers are widely used in the production of high-strength, lightweight materials for packaging and composites. They enhance the mechanical properties and biodegradability of these materials, making them suitable for sustainable packaging solutions. In the biomedical field, they are utilized in wound dressings and drug delivery systems due to their biocompatibility and ability to form hydrogels. They also serve as effective stabilizers and thickeners in the food and cosmetics industries, improving texture and consistency. Additionally, their high surface area and functional groups make them valuable in water purification processes for adsorbing contaminants and heavy metals.