Recently, some commercial websites collect browsing history and device information for use in services they provide. In this paper, we focused on font information that can be obtained via a web browser to determine what kind of software can be identified about a given device. According to existing research, it is possible to identify installed applications such as the Adobe Flash Player and Microsoft Office using such font information. Thus, we have examined the fonts installed by operating systems (OS) and applications. Our results show that font information on a device can be used to identify installed applications and OS type and version.