Azido-PEG1-azide is widely used in bioconjugation and click chemistry applications. Its dual azide groups make it a valuable linker for connecting molecules through copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. It is particularly useful in modifying biomolecules, such as proteins, peptides, and nucleic acids, enabling the creation of complex structures for research and therapeutic purposes. Additionally, it is employed in the development of drug delivery systems, where it helps in attaching targeting ligands to carriers. Its PEG (polyethylene glycol) spacer enhances solubility and reduces immunogenicity, making it suitable for biomedical applications. This compound is also utilized in material science for surface functionalization and creating crosslinked polymers with specific properties.