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WinDirStat is a disk usage analyzer and cleanup assistant for Microsoft Windows.

On start up, it scans the selected drives or folders and then presents the results in several useful views:

• The All Files and Largest Files views, which resemble the tree view of the Windows Explorer but are sorted by file/subtree size,
• The Duplicate Files, Search Results, and File Watcher views for finding and monitoring files,
• The treemap, which shows the whole contents of the directory tree straight away,
• The extension list, which serves as a legend and shows statistics about the file types.

The treemap represents each file as a colored rectangle, the area of which is proportional to the file's size. The rectangles are arranged in such a way, that directories again make up rectangles, which contain all their files and subdirectories. So their area is proportional to the size of the subtrees. The color of a rectangle indicates the type of the file, as shown in the extension list. The cushion shading additionally brings out the directory structure.