Over a decade, the development of atom-thin graphene membranes has been limited by the lack of a scalable and reproducible membrane preparation method. This work shows that graphene membranes can be scaled up, that too with reduced cost and attractive performance in the important application of carbon capture. We address three key challenges: developing high-quality graphene and membranes from low-cost Cu foil, scaling up a reactor that allows the generation of porosity uniformly, and developing a transfer technique that allows the realization of a 50-cm 2 -sized 64 v5.51 software. AC-HRTEM imaging of graphene was realized on a ThermoFischer Titan Themis operated at 80 kV.