Researchers have created the world’s smallest QR code, demonstrating a new approach to storing digital information in extremely durable materials, tells Live Science. The record-breaking code measures just 1.98 square micrometers, making it smaller than many bacteria and roughly 37% percent smaller than the previous world record holder. Because each pixel is only 49 nanometers wide, the code cannot be seen with the naked eye or even with standard optical microscopes. Instead, scientists must use an electron microscope to detect and read its microscopic structure.
The project was led by researchers at TU Wien (Vienna University of Technology) in collaboration with data-storage company Cerabyte. To create the tiny code, the team used a focused ion beam to etch the QR pattern into a thin film of chromium nitride, a ceramic material known for its durability and stability. Ceramics are commonly used to coat industrial cutting tools because they can withstand extreme conditions without degrading. These same properties make them attractive candidates for long-term digital storage.
Unlike conventional data storage technologies, such as magnetic hard drives or solid-state drives, ceramic-based storage does not degrade quickly. Typical electronic storage devices may fail within a decade, while optical media such as CDs and DVDs often last only a few decades. The ceramic material used for the QR code could theoretically preserve encoded data for thousands of years, offering a potential solution to the growing problem of long-term digital archiving.
The technology also offers remarkable storage density. Researchers estimate that if the same nano-patterning technique were applied across a surface the size of an A4 sheet, it could store more than two terabytes of data in a single layer. Equally important, the system requires no electricity or cooling to preserve the stored information, making it far more energy-efficient than modern data centers.
Although the microscopic QR code itself mainly demonstrates the concept, the underlying method could enable new archival storage systems capable of preserving scientific records, cultural data, or government documents for centuries. Researchers are now exploring faster manufacturing techniques, alternative materials, and more complex data formats that could turn this experimental approach into a practical technology for long-term digital preservation.