In this study, we show that at the nanoscale, capillary force is a powerful driving force that can effectively cause self-limited cold welding of the wire−wire junction for Ag NWs.The capillary-force-induced welding can be simply achieved by applying moisture on the Ag NW film, without any technical support like the addition of materials or the use of specific facilities. The moisture-treated Ag NW films exhibit a significant decrease in sheet resistance, but negligible changes in transparency.