Polyvinylidene fluoride (PVDF) polymer is considered as an encouraging piezoelectric material whose optical properties need to be enhanced. Zinc ferrite is an excellent photoelectric material, in the present work it was doped separately by (cobalt and copper) ferrite. Co-ZnFe₂O₄ and Cu-ZnFe₂O₄ nanoparticles were synthesized using auto-combustion method and characterized using XRD, FTIR, FESEM and HRTEM. The crystallite size was (28.8, 35.8, 22 and 31) nm for the Co-ZnFe₂O₄ and Cu-ZnFe₂O₄ nanoparticles, while the estimated particle size from HRTEM were 55 nm for the Co-ZnFe₂O₄ nanoparticles and 75 nm for the Cu-ZnFe₂O₄. The obtained samples used as PVDF fillers, aiming to improve its optical properties. The optical properties as well as, the piezoelectric response of the prepared PVDF/(Co-ZnFe₂O₄ and Cu-ZnFe₂O₄) nanocomposites were investigated. The maximum value for refractive index was related to PVDF/Co-ZnFe2O4 nanocomposite. While, Cu-ZnFe₂O₄ nanoparticles have limited improvement of the PVDF optical properties. Co-ZnFe₂O₄ nanoparticles increases the PVDF optical conductivity σ_opt. four times its original value as well as the dielectric values was increased from 0.05 for neat PVDF to 2. The piezoelectric response of the PVDF polymer is clearly increased by the addition of both Co-ZnFe₂O₄ and Cu-ZnFe₂O₄ nanoparticles.