TreeSize Free 可以快速找出最佔空間的資料夾，用這支程式開啟某個磁碟根目錄或者資料夾，它便會快速計算出資料夾大小，並且預設是以資料夾由大到小來排序。TreeSize 除了免費版之外還提供了Professional專業版，不過功能完整很多，有一堆圖表、分類選項與細節可查詢。一般使用者用免費的TreeSize Free來作簡單的查詢或匯出報表…等也很足夠。

Every hard disk is too small if you just wait long enough. TreeSize Free Portable tells you where precious space has gone to. TreeSize Free can be started from the context menu of a folder or drive and shows you the size of this folder, including its subfolders. You can expand this folder in Explorer-like style and you will see the size of every subfolder. Scanning is done in a thread, so you can already see results while TreeSize Free is working. The space, which is wasted by the file system, can be displayed and the results can be printed in a report.

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