Structural,elastic,electronic,chemical bonding and optical properties of the cubic RbPbF3 compound under pressure are studied using a highly accurate state-of-the-art full potential linearized augmented plane wave method.The exchange correlation effects are included through the generalized gradient and modified Becke-Johnson exchange potential.The lattice constant and band gap of the cubic RbPbF3 decreases with enhanced pressure.RbPbF3 is brittle,elastically anisotropic,and a direct bandgap material Its optical properties such as refractive index n(ω),extinction coefficient k(ω),reflectivity R(ω),and optical conductivity σ(ω) are predicted.