WinDirStat
Visualizes Windows disk usage so oversized folders are easy to spot.
WinDirStat is an open-source Windows utility for finding where storage space is being used across drives or selected folders. It combines directory lists, file-type statistics, duplicate detection, and a color-coded treemap so users can inspect large files and act on them from inside the app.
Why it stands out
- Open-source GPLv2 project with source code and issue tracking on GitHub.
- Treemap view makes file size relationships visible at a glance instead of relying only on tables.
- Supports both whole-drive and folder-specific scans, with faster NTFS-specific scanning where supported.
- Goes beyond simple size reporting with duplicate detection, physical-versus-logical size comparison, and file-operation shortcuts.
Good to know
- Built specifically for Microsoft Windows, so it is not a cross-platform disk analyzer.
- Direct NTFS scanning is only available where the underlying filesystem supports it.
- Built-in move and delete actions operate on real files, so cleanup decisions still require careful review.
Photos
Windows users and IT support staff can pinpoint storage-heavy folders before cleaning or migrating a machine. Audit a drive to find unusually large files, archives, or media collections. Compare logical and physical file sizes when investigating storage overhead. Find duplicate files by content before deciding what can be removed. Open, move, or delete files discovered during a disk cleanup session.
Drive and folder scanning; interactive treemap visualization; sortable directory and extension views; largest-file reporting; duplicate-file detection by content; file permission and storage-tier inspection; scan export/save options; portable settings, dark mode, and Windows Explorer integration.
Alternative listings
A Windows drive-health monitor for S.M.A.R.T., NVMe and RAID storage.
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- WizTree — diskanalyzer.com
- TreeSize — jam-software.com/treesize
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