Piezoelectric wind energy harvesters (PWEHs) have rapidly gained recognition as a promising technology for self-powered devices. These devices utilize the unique properties of piezoelectric materials to convert wind energy into electrical energy, providing a sustainable and renewable power source. In this study, we present a design for a PWEH employing a flag-like structure and experimentally investigate its performance under various wind conditions. The relationship between output power and external load resistance is also investigated. Our research reveals that the proposed PWEH has a cut-off wind speed of 1.4 m/s, beyond which it can efficiently harness wind energy. Under optimal conditions, the PWEH achieves a peak power output of 21 mW when exposed to a wind speed of 5.5 m/s. This level of performance is attained by utilizing an external load resistance of 1 MΩ. The choice of external load resistor was found to have a significant impact on the output power, emphasizing the importance of load resistor selection in maximizing their performance. These findings demonstrate the potential of PWEHs as a sustainable energy solution for self-powered devices.