Alginate, which can be extracted from various brown seaweed species, is a sustainable biomaterial with several potential biomedical applications because of its biocompatibility and biodegradability. While alginate hydrogels are traditionally ionically crosslinked with divalent cations, this approach often produces hydrogels with low mechanical strength and poorly controlled degradation kinetics, limiting their suitability for biomedical applications. The chemical modification of alginate via methacrylation to produce alginate methacrylate (ALMA) allows the fabrication of photocrosslinkable hydrogels under ultraviolet (UV) light irradiation. This approach enables the fabrication of alginate-based hydrogels with superior physicochemical properties that can be tailored for specific biomedical areas. However, there is a relative lack of research related to the performance of ALMA bioinks in 3D printing using digital light processing (DLP). The research conducted to date indicates a connection between the choice of alginate source, methacrylation chemistry, and printing outcomes. This review directly addresses this topic by considering alginate extraction from brown seaweed, ALMA synthesis methods, and the biomedical applications of ALMA as a 3D hydrogel using DLP.  For this purpose, the focus has been on how each step in the process affects the performance of the materials used in final biomedical applications. The goal of this review is to provide researchers with a framework for optimizing ALMA-based bioinks for DLP-based biomedical fabrication.