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WinDirStat

WinDirStat

Free, open-source treemap-based disk usage analyzer for Windows drives.

softwareDisk Space Analyzersdisk-analyzerwindowsopen-source
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Our Verdict

Best for

Windows users who want a free, open-source treemap-based disk usage analyzer.

Skip if

You're on Mac or Linux, or you want built-in cloud storage scanning.

What is WinDirStat?

WinDirStat is a free, open-source disk usage analyzer for Microsoft Windows that scans drives and folders and shows how disk space is distributed across the file system. It uses multithreaded scanning with direct NTFS support and presents results as sortable lists, extension statistics, a Largest Files view, and an interactive treemap that makes it easy to visually spot which folders and file types are consuming the most space. Beyond basic scanning, WinDirStat can detect duplicate files by content, inspect file permissions, and analyze storage tiers, and it supports file operations like opening, moving, or deleting items directly from the results view. It also offers dark mode, Windows Explorer integration, file-system change monitoring, and scan export, and is distributed under the GNU General Public License version 2 (GPLv2) with source code hosted on GitHub.

SpecificationsAI-estimated

deploymentDesktop App
open source✅ Yes
api available❌ No
support optionsCommunity support via GitHub issues
key integrationsWindows Explorer integration

Key Features of WinDirStat

Scans drives and folders with multithreaded scanning and direct NTFS support for faster results.
Visualizes disk usage as an interactive treemap so large files and folders stand out at a glance.
Provides sortable lists and extension statistics to break down space usage by file type.
Includes a Largest Files view to quickly find the biggest space consumers.
Detects duplicate files by comparing file content, not just names.
Lets users inspect file permissions and analyze storage tier information.
Supports file operations such as opening, moving, or deleting files directly from scan results.
Offers dark mode, Windows Explorer integration, and the ability to export scan results.

Use Cases for WinDirStat

1

Freeing Up a Windows PC

Identify which folders and file types are consuming the most space on a Windows hard drive or SSD.

2

Finding Duplicate Files

Locate duplicate files by content to reclaim wasted space.

3

IT Storage Audits

Use the treemap and statistics views to audit storage usage on office or server drives.

4

Preparing for a Drive Upgrade

Review the largest files before migrating to a smaller or new drive.

Pros & Cons of WinDirStat

Pros

  • Completely free and open source under GPLv2
  • Interactive treemap makes large files easy to spot visually
  • Built-in duplicate file detection by content
  • Source code is publicly available on GitHub for transparency

Cons

  • Windows-only, no Mac or Linux version
  • Interface is more utilitarian than modern, polished commercial tools
  • No cloud storage scanning support mentioned on the site

Frequently Asked Questions

Is WinDirStat free?

Yes, it is free and open-source software licensed under GPLv2.

What operating systems does WinDirStat support?

It is built for Microsoft Windows.

Can WinDirStat find duplicate files?

Yes, it can detect duplicate files by comparing file content.

Is the source code available?

Yes, the source code is hosted on GitHub at github.com/windirstat/windirstat.

Pricing Overview

View full pricing →
Free

WinDirStat

Free

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💻Developers🏢Enterprise Teams

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About the Product

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Platforms
Windows
Target AudienceWindows users and IT admins who want a free way to visualize disk usage

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disk-analyzerwindowsopen-sourcetreemapstorage

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