Biopolymer-based metal nanoparticles are a fascinating field of study that combines the various applications of metal nanoparticles with the unique properties of biopolymers. Biopolymers, such as proteins, nucleic acids, and polysaccharides, are natural polymers formed by living organisms. They are often environmentally friendly, biocompatible, and renewable. Metal nanoparticles, on the other hand, are tiny particles of metals typically at the nanoscale (1–100 nm), including gold, silver, and copper. Due to their small size, nanoparticles possess remarkable capabilities and can be utilized in various applications such as biomedical fields, catalysis, environmental remediation, food packaging, textiles, and cosmetics.