4-Bromo-2-formylbenzoic acid is primarily used as a versatile intermediate in organic synthesis. It plays a significant role in the production of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs). Its functional groups, including the bromo and formyl substituents, make it a valuable building block for constructing complex molecules through various chemical reactions, such as coupling and condensation processes. Additionally, it is utilized in the synthesis of dyes, agrochemicals, and other fine chemicals, where its structure allows for further functionalization and modification to achieve desired properties.