Touch input visualizations for web-based interaction are described. Script associated with a web application is configured to process information regarding touch input events and produce corresponding visualizations for touch inputs when executed at a client device. In one approach, touch input events at the client device are captured and analyzed to determine characteristics of touch input including at least locations within a user interface corresponding to the touch input. A mark-up language document that is rendered in the user interface may be modified to define visualizations for the touch input at the locations. The mark-up language document including the visualizations at the locations may then be output via the user interface. A collaboration module may be used to share the user interface including the touch visualizations to another screen, such as during a meeting or online demonstration.