Techniques for automatically transmitting user profile data over a network are provided. In one technique, a browser displays a form and a QR code (or other form of encoded data) on a webpage. A mobile application scans the QR code, which causes the mobile application to identify user profile data (that may be stored locally with respect to the mobile application) and send the user profile data to a Campaign server. The Campaign server causes the form that is displayed by the browser to be filled in with the user profile data. The browser than transmits the filled-in form to a partner server that provides the webpage. In another technique, a mobile application scans a QR code, which may be displayed on a flyer, a poster, a computer screen, or a television screen. The mobile application identifies and transmits user profile data to a Campaign server.