这是QR码扫描仪工具。 将 QR 码图像拖放到放置区。 电装波在1994年创建了QR码。 The size of a QR code shouldn’t be below 1 x 1 cm (0.4 x 0.4 in). Having a QR code printed in a smaller size might not be able to be decoded by a QR code reader/scanner.