Azido-PEG12-acid is widely used in bioconjugation and click chemistry applications. Its azide group enables efficient and selective reactions with alkynes, making it valuable for labeling biomolecules such as proteins, peptides, and nucleic acids. The PEG12 spacer enhances solubility and reduces steric hindrance, ensuring better accessibility in biological systems. This compound is particularly useful in drug delivery systems, where it facilitates the attachment of therapeutic agents to targeting molecules. Additionally, it is employed in surface modification of nanoparticles and biomaterials to improve biocompatibility and functionality. Its versatility also extends to the development of diagnostic probes and imaging agents, where it aids in creating stable and specific conjugates for detection purposes.