We provide the complete set of radiative corrections to the Dalitz decays η ð0Þ → l þ l − γ beyond the softphoton approximation, i.e., over the whole range of the Dalitz plot and with no restrictions on the energy of a radiative photon. The corrections inevitably depend on the η ð0Þ → γ à γ ðÃÞ transition form factors. For the singly virtual transition form factor appearing, e.g., in the bremsstrahlung correction, recent dispersive calculations are used. For the one-photon-irreducible contribution at the one-loop level (for the doubly virtual form factor), we use a vector-meson-dominance-inspired model while taking into account the η-η 0 mixing.