As shown in Figure , we developed a simple, configurable method to uniformly pattern images for personalized anti-counterfeiting. We fabricated devices with the Stanford University logo, the Stanford Bunny, the outline of the Stanford Memorial Church, and a simplified Congreve Lab logo upon excitation with an 850 nm LED. We captured clear pictures of the upconverted images under room lighting (see Figure SI 11) with low excitation intensities between 10 and 100 mW/cm 2 .