Significant　challenges　remain　in　developing　rechargeable　zinc　batteries　mainly　because　of　reversibility　problems　on　zinc-metal　anodes.　The　dendritic　growth　and　hydrogen　evolution　on　zinc　electrodes　are　major　obstacles　to　overcome　in　developing　practical　and　safe　zinc　batteries.　Here,　a　dendrite-free　and　hydrogen-free　Zn-metal　anode　with　high　Coulombic　efficiency　up　to　99.6%　over　300　cycles　is　realized　in　a　newly　designed　nonaqueous　electrolyte,　which　comprises　an　inexpensive　zinc　salt,　zinc　acetate,　and　a　green　low-cost　solvent,　dimethyl　sulfoxide.　Surface　transformation　on　Cu　substrate　plays　a　critical　role　in　facilitating　the　dendrite-free　deposition　process,　which　lowers　the　diffusion　energy　barrier　of　the　Zn　atoms,　leading　to　a　uniform　and　compact　thin　film　for　zinc　plating.　Furthermore,　in　situ　electrochemical　atomic　force　microscopy　reveals　the　plating　process　via　a　layer-by-layer　growth　mechanism　and　the　stripping　process　through　an　edge-dissolution　mechanism.　In　addition,　Zn||Mo6S8　full　cells　exhibit　excellent　electrochemical　performance　in　terms　of　cycling　stability　and　rate　capability.　This　work　presents　a　new　opportunity　to　develop　nonaqueous　rechargeable　zinc　batteries.