4-Fluorobenzoic anhydride is primarily used as a key intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. It serves as a building block for creating more complex molecules, especially those containing the 4-fluorobenzoate moiety, which is often incorporated into active pharmaceutical ingredients. The compound is also utilized in the synthesis of dyes, pigments, and specialty chemicals, where its fluorinated aromatic structure imparts specific properties to the final product. Additionally, it finds application in polymer chemistry as a monomer or cross-linking agent, contributing to the development of advanced materials with tailored characteristics.