Create QR codes for URLs, texts, WhatsApp and SMS messages, E-Mails, Phone numbers, vCards, and more directly from your WordPress admin area.
Demo: https://patrickposner.com/qyrr/
A barcode is an encoding tag or label that is placed on all products that allow computers, scanners and mobile devices to track and find these products much faster.
Demo: https://yithemes.com/themes/plugins/yith-woocommerce-barcodes-and-qr-codes/