You can share the QR code of your LINE Official Account on your website or in a printed format to let users easily add your LINE Official Account as a friend by scanning the code.
Find the QR code image on the Messaging API tab of your channel settings on the LINE Developers Console or in the Gain friends page of the Home tab in LINE Official Account Manager (opens new window). You can paste the HTML snippet found in LINE Official Account Manager to your website to display the QR code.