Nanotechnology has become an essential driving force in various fields including science, industry, and innovation, particularly in the development of new technologies and materials such as nanomaterials, metal oxides, carbon-based nanomaterials, and quantum dots have demonstrated significant potential in enhancing textiles, electronics, medicine and biotechnology properties. QDs were synthesized, resulting in nanoparticles within the size range of 2–10 nm. These quantum dots exhibit strong UV absorption and photoluminescence at longer wavelengths, making them suitable for incorporation into various applications. This research focuses on the synthesis and application of quantum dots derived from squid ink is an eco-friendly substance that can be utilized in the development of sustainable technologies. Squid ink, particularly from species in the Coleoidea subclass, contains eumelanin, a natural pigment that possesses multiple functional properties including antimicrobial activity, antioxidant capacity, and ultraviolet (UV) protection. In this research, quantum dots will be synthesized from squid ink using an isothermal process. The results showed that QDs were investigated via TEM and particle size showed lattice structures that formed 4–10 nm. FT-IR showed no differences in peaks derived from organic components. The photoluminescent properties of QDs were evidenced by powerful fluorescent emission ability of eumelanin at 440 nm. The findings aim to demonstrate a sustainable and marine-derived approach for enhancing functionalities through the use of biogenic nanomaterials.