Ultra-thin strain sensors have attracted vast attention because of their ultra-thin and ultra-soft skin-conformable nature with numerous applications in wearable electronics for health monitoring, soft robotics, and human–machine interfaces. With the most recent developments in printing technologies, printing electronics directly on ultra-thin substrates is now more beneficial comparing with the conventional lithographic based electronic fabrication techniques, as printing offers several unique benefits in terms of wide-ranging material processability, process simplification, rapidness, and lower costs. Here, we report ultra-thin and high performance strain sensors based metal/polymer nanocomposite films, fully fabricated by inkjet-printing on a ≈ 1µm thick biocompatible temporary transfer tattoo substrates. The sensor patches are consist of two inkjet printed layers, a highly conductive metal bottom-layer made of silver nanoparticles (AgNPs) and a polymer top-layer made of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS).