Not necessarily. Window films will increase the temperature of your sunlit glass, which will in turn increase the stress on the glass’ edges. The quality of the glass edge and several other factors (external shading, interior shading, glass history, type of film, size/shape of glass, indoor/outdoor temperature) all contribute to the risk of glass breakage.
3M’s experience with applying window film to different types of glass enables it to make proper film to glass recommendations and reduce the potential for glass breakage. While there are no guarantees that a specific film is safe for a specific situation, trained professionals help to minimize the likelihood of breakage. That is why less than one window breaks for every 1,000 that are filmed according to industry studies. Respectable manufacturers provide consumers reassurance by warrantying against glass breakage due to the installation of window film.