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There is growing interest in recent times to develop biodegradable films with improved properties. They are potential substitutes for existing petroleum-based synthetic polymers. Eco-friendly biofilms based on Poly (vinyl alcohol)/Nano coconut shell filler (PVA/NCSF) were primed by a solution casting method. The biofilms were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis, Tensile test, FESEM, Transparency Water absorption, biodegradability test, and tensile testing. FTIR and XRD results revealed the structural characterization and crystallinity index of prepared PVA/NCSP biofilms. FTIR suggested that strong hydrogen bonding due to interfacial exchanges of PVA/NCSF. Thermogravimetric analyses revealed thermal degradation temperatures of biofilms that were observed between 259.79°C and 350°C. The tensile strength and elastic modulus …