Copper chloride is used as a catalyst for organic and inorganic reactions, mordant for dyeing and printing textiles, pigment for glass and ceramics, wood preservative, disinfectant, insecticide, fungicide, and herbicide, and as a catalyst in the production of chlorine from hydrogen chloride.

Copper chloride is the chemical compound with the chemical formula CuCl₂. This is a light brown solid, which slowly absorbs moisture to form a blue-green dihydrate. The copper(II) chlorides are some of the most common copper(II) compounds, after copper sulfate. Copper(II) chloride may be used in the preparation of copper(II)-chitosan complexes with potential applications in biomedical devices as antibiotic-free antibacterial biomaterials due to their cytocompatibility and antibacterial property

Copper chloride is also used in pyrotechnics as a blue/green coloring agent. In a flame test, copper chlorides, like all copper compounds, emit green-blue.In humidity indicator cards (HICs), cobalt-free brown to azure (copper(II) chloride base) HICs can be found. It is  also used as effective catalyst for the tetrahydropyranylation of alcohols, using mild conditions and in high yields. Also Used with palladium in a catalytic synthesis of 3-haloindoles via an annulation process

The copper chlorides are important both in corrosion processes of copper alloys and in their occurrence as pigments in wall paintings, manuscript illumination, and other paintings. It is now known that there are four isomers of copper trihydroxychloride, namely clinoatacamite, atacamite, paratacamite and botallackite. Clinoatacamite should replace most previously reported occurrences of paratacamite in the conservation literature.

Copper chloride is a yellowish-brown powder (the anhydrous form) or a green crystalline solid (the dihydrate). Noncombustible but hydrogen chloride gas may form when heated in a fire. Corrosive to aluminum. Used to manufacture other chemicals, in dyeing, in printing, in fungicides.