High-temperature superconductor films of YBa2Cu3O7-x were fabricated by electrochemical synthesis of precursors from a solution of nitrate salts of the metallic constituents in isopropanol. The precursor films were composed of hydroxides which when heat-treated in oxygen formed a YBa2Cu3O7-x superconductor. The superconducting transition temperatures were 79 K for a film from a single simultaneous deposition of the metallic components and 88 K for a film from several successive depositions.