QR Code Rubber Stamp - Custom QR Code Stamp We Will Contact You within three hours of your order to request customization for the stamp. We need the URL that you want on the bottom of the stamp and to use to create the QR Code. QR Code Rubber Stamp - Custom QR Code Stamp Stamp impression is roughly 1.5" x 1.5". Self-Inking rubber stamp with the pad inside makes it quick and easy to stamp