© 2023 Chinese Physical Society and IOP Publishing LtdExisting pion+nucleus Drell-Yan and electron+pion scattering data are used to develop ensembles of model-independent representations of the pion generalized parton distribution (GPD). Therewith, one arrives at a data-driven prediction for the pion mass distribution form factor, ? 2 ? . Compared with the pion elastic electromagnetic form factor, ? 2 ? is harder: the ratio of the radii derived from these two form factors is r ? ? 2 / r ? = 0.79 ( 3 ) . Our data-driven predictions for the pion GPD, related form factors and distributions should serve as valuable constraints on theories of pion structure.