Read and generate QR codes for products, URLs, vCards, phone numbers, calendar events, and more with this fun and useful app.

A model introduces QR codes on Samsung Electronics home appliances customized for the Sullivan Plus visual aid app on Dec. 29.

After years of declining use in the United States, QR codes have become ubiquitous during the pandemic. But in China, they’ve been consistently popular. Valerie Macon/Agence France-Presse ...