這是QR碼掃描器工具。 將 QR 碼圖像拖放到放置區。 電裝波在1994年創建了QR碼。 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.