The mechanical properties of substrate-supported thin films are commonly studied by nanoindentation tests. However, this method has a lower limit on the film thickness, which should exceed ∼10 times the indentation depth to avoid interference from the substrate. As an alternative approach, microbulge tests have been used to probe the mechanical properties of freestanding membranes from different materials, such as carbon nanosheets, titania nanocrystals (TNCs), and gold nanoparticles. Using bulge experiments, the elastic properties are sampled non-destructively over a larger area compared to local nanoindentation tests. In a recent study, we applied microbulge tests to measure the elastic prop-erties of crosslinked gold nanoparticle membranes. Besides, we demonstrated applications of freestanding gold nanoparticle membranes as highly sensitive resistive pressure gauges and electrostatic actuators. Drawbacks of these membranes are their limited mechanical stability and susceptibility to oxidation.