 Highlight's freestanding lead-free piezo-ceramic thin films can be derived via water-pealing. The D-33 value of the freestanding BCZT thin film reaches 209 p.m. v-1. The freestanding piezo-ceramic films obtain versatile application scenarios such as energy harvest and virus detection. This article was authored by Shihuan Liu, Junchen Liao, Xinhuang, and others.