Phthalamic acid is primarily used as an intermediate in the synthesis of various pharmaceuticals and agrochemicals. It plays a key role in the production of certain herbicides and fungicides, contributing to crop protection and agricultural productivity. Additionally, it is utilized in the manufacturing of dyes and pigments, where it acts as a precursor to achieve desired color properties. In the pharmaceutical industry, it serves as a building block for the development of active pharmaceutical ingredients (APIs), particularly in the synthesis of compounds with potential therapeutic effects. Its versatility in organic synthesis makes it valuable for creating complex molecules in research and industrial applications.