TreeSize is a small executable that lets the user visualize how much space a drive or a folder and its subfolders is taking. Opening the program and opening any directory or folder presents a windows explorer like and expandable list of folders.
The results can be viewed in KB, MB, GB, or even mixed units so that varied folder sizes can be more precisely accounted for. It is also possible to view the sizes in percentage, file count and cluster size.
It is also possible to enable or disable the bar that acts as a relative size indicator (see image below). Most interestingly perhaps are the options to add TreeSize to file and drive context menus accessible via right click and the ability to show tooltips when hovering over the results. The tooltips provide such info as Wasted space, in how data chunks are handled by the operating system, and such things as Creation Date, Average File Size and folder Permissions. Buried under View—>Options is File Filter which lets the user ‘Enter one of more file filters which should be included in a scan’, but it proves mostly useless since it seems to only be an indicator that an uncertain number of a certain file type exists within a folder.
The current version, 2.2.1 , is compatible with Windows 2000, XP and Vista but the last Windows 98 and ME compatible version, 2.1, is also available. TreeSize is freeware but a professional version with many more features, including the ability to export reports to formats other than a simple print job, is also available.