Crafting groups are now abuzz with the newest QR code medium: cross-stitch. What is a QR code and what can it do? Just as a barcode holds the name and price of a product, a QR code contains data.

“My grandmother taught me when I was about eight years old. It was on stamped cross-stitch,” she said. While she loved the hobby as a child, in part because it bonded her and her ...