WIP at https://github.com/tianshuo/mobile-2d-barcode-login Note that this kind of login is already live and default for Chinese popular online chat - wechat(微信). The working url is wx.qq.com and you will need to login using the Wechat mobile client. The feature is to bind a computer keyboard with the mobile phone so typing is a whole lot easier. The strength of this idea is not logging in, but online payment, remote controlling of TVs, interaction using mobile phone with outdoor ads, binding keyboards to mobile phones, etc.