An innovative nanopaper-transfer method enabled by the high surface free energy of nanocellulose is reported. Utilizing this technique, Ag nanowire percolating network based transparent conductive electrodes with ultrahigh figure of merit are realized. With the exceptional surface properties of this novel nanopaper electrode, a foldable electrochromic nanopaper device with a stable performance is demonstrated for the first time. This nanopaper-transfer technique holds great promise for the next generation deformable electronics.