Windows · System & Disk Utilities
WinDirStat for Windows
Open-source disk usage analyzer that renders a color-coded treemap of every file on a drive, making huge files and folders visually obvious.
Updated August 9, 2026 · Reviewed by SoftNexi Editorial Team, Software research and documentation
Overview
WinDirStat is a long-running open-source disk usage tool best known for its treemap view: a rectangle for every file, sized by disk usage and colored by file type, packed into a single window. Large files and folders are immediately, visually obvious in a way a plain list isn't.
Alongside the treemap, it also shows a conventional sortable folder tree and a file-extension list summarizing which types of files (video, archives, system files) consume the most space overall — useful for spotting a category problem, not just a single big folder.
It's a mature, community-maintained tool rather than a commercial product, so don't expect frequent UI overhauls; the interface looks and behaves largely as it has for years. Development has been intermittent, so treat any specific claims about the newest Windows versions with a grain of caution and test in your own environment.
It complements a file-manager-style tool like TreeSize Free well: use the treemap in WinDirStat to spot the outlier visually, then decide what to do about it.
Key features
- Color-coded treemap visualization of disk usage by file
- Conventional sortable folder tree alongside the treemap
- File-extension summary showing which file types use the most space
- Click a treemap tile to jump straight to that file in the tree
- Delete or open files directly from the results
- Open-source codebase available for review
System requirements
- Operating system
- Windows 11 and Windows 10 (older Windows releases also supported)
- Architecture
- x64 or x86 build
- Permissions
- Administrator rights recommended for scanning system folders
How to install WinDirStat
1. Download from the official site
Get the installer or portable build from windirstat.net/download.html.
2. Install or unpack
Run the installer, or use the portable option if offered, then launch the app.
3. Select a drive to scan
Choose a drive or folder on first launch; the initial full-drive scan can take a few minutes depending on file count.
How to use it
1. Read the treemap
Each colored rectangle is a file; bigger rectangles mean bigger files. Color groups by file type, shown in the legend at the bottom.
2. Click through to a file
Click any tile in the treemap to highlight the matching entry in the folder tree above, then act on it from there.
3. Check the extension list
Use the top-right list to see which file types (e.g., .mp4, .zip) account for the largest share of used space overall.
4. Delete carefully
Use the right-click delete option once you've confirmed a file or folder is safe to remove; there's no confirmation beyond the standard Windows prompt.
Safety and privacy
- Download from windirstat.net or the project's official GitHub releases page rather than third-party mirrors.
- As an open-source project, the source is publicly available for review.
- Bundled software
- The official installer does not bundle third-party offers.
- Privacy
- Runs entirely locally and requires no account or network connection to scan a drive.
Known risks
- Development pace has varied over the tool's history; if you need guaranteed active support, a commercially maintained alternative like TreeSize or WizTree may fit better.
What's new
Current release
WinDirStat is maintained on an intermittent, community basis. Check the project's site or GitHub for the current release status before relying on it for the very latest Windows builds.
Pros and cons
Pros
- Distinctive treemap makes large outlier files jump out visually
- Free and open source
- File-extension summary adds a useful second view
- No installation required if using a portable build
Cons
- Interface feels dated next to newer tools
- Development has been intermittent over the years
- Slower on very large drives than purpose-built fast scanners
Verdict
WinDirStat's treemap is still one of the fastest ways to visually spot what's eating a drive, and being free and open source keeps it a reasonable pick despite its age. If you want an actively developed, faster alternative, look at WizTree.
Frequently asked questions
Is WinDirStat still maintained?
It's community-maintained on an intermittent basis rather than by a commercial company. It generally still works on current Windows versions, but check the project page for the latest status.
Is WinDirStat free?
Yes, it's free and open source under the GNU GPL.
What's the difference between the treemap and the tree list?
The tree list is a conventional sortable folder/file list; the treemap is a visual grid where rectangle size represents disk usage, making large files easy to spot at a glance.