Disk usage analyser for Windows with treemaps, largest-file and duplicate finders, CSV/JSON exports and cleanup tools.
Open-source alternative toWizTree commercial licenceTreeSize Personal and Professional
WinDirStat at a glance
Checked 21 Oct 2026WinDirStat (2.9.3, October 2026, actively developed) scans drives, folders, network shares and phones, then shows usage as sortable lists, file-type stats and treemaps, sunbursts or flame graphs. It finds the largest files and duplicates, handles hard links and cloud files, exports scans and reports to CSV or JSON from the command line and can recover deleted files with admin rights. Accelerated NTFS scans need elevation. Windows only. GPL-3.0 or later. No scheduled scans built in.
RepoQuarry. “WinDirStat.” Checked 21 Oct 2026. https://repoquarry.dev/projects/windirstatHow much of WizTree commercial licence does it replace?
- Personal use
- Confirmed: Yes
- For a business
- Partial: Partly Commercial use with conditions: Free to use at work; GPL conditions apply if you distribute modified versions
4 of 4 jobs. Treemap, largest files, duplicates and CSV export with no licence fee at work; WizTree's direct MFT scan is faster, and WinDirStat's accelerated NTFS scan needs admin rights.
How much of TreeSize Personal and Professional does it replace?
- Personal use
- Confirmed: Yes
- For a business
- Partial: Partly Commercial use with conditions: Free to use at work; GPL conditions apply if you distribute modified versions
4 of 5 jobs. Covers analysis, duplicates and CSV/JSON exports; no built-in scheduled scans, Excel or PDF reports, or usage-over-time comparison.
For scheduled scans and exports, see other TreeSize Personal and Professional alternatives. You may also need to build an interface, an API server and hosting yourself.
Facts, with sources
Every answer links to where we found it. We read the documentation; we did not install it.
Scan drives, folders, network shares, or connected MTP devices, then explore disk usagegithub.com · windirstat#description ↗ today
The application itself is distributed under the terms of the GPL v3 or latergithub.com · windirstat#copyright--licenses ↗ today
The application itself is distributed under the terms of the GPL v3 or latergithub.com · windirstat#copyright--licenses ↗ today
Install with `winget install -e --id WinDirStat.WinDirStat`github.com · windirstat#installation ↗ today
WinDirStat 2.x has been developed for and tested on the following operating systems.github.com · windirstat#compatibility ↗ today
If you are not sure which file to choose, download the 64-bit MSI installer.github.com · windirstat#installation ↗ today
No licence changes since we started watching. Licence watch: follow WinDirStat and we email you if its licence terms change.
Growth and activity in detail
Is it popular, and is anyone still working on it? From GitHub.
Numbers appear after the first nightly fetch from GitHub.