Download WizTree — Fast Disk Space Analyzer

Yes, WizTree is safe. The software has been developed by Antibody Software Limited since 2012 and is trusted by system administrators across enterprise environments. It contains no malware, adware, or bundled toolbars.

The official installer (about 5 MB for version 4.30) has been scanned clean by major antivirus engines including Windows Defender, Malwarebytes, and Kaspersky. WizTree does not transmit your file data over the internet. It reads your NTFS Master File Table locally and never phones home with scan results. The application is digitally signed by Antibody Software, so Windows will verify the publisher name during installation.

• Only download from the official site at diskanalyzer.com — fake download sites exist that bundle unwanted software
• Right-click the installer and choose “Properties” to verify the digital signature says “Antibody Software Limited”
• Windows SmartScreen may show a warning because WizTree is not from a large corporation — click “More info” then “Run anyway”

Pro tip: If your company firewall blocks the download, grab the portable ZIP version instead. It runs without installation and leaves nothing behind on the system.

See our download section for verified links to the official WizTree installer.

The official download page for WizTree is hosted at diskanalyzer.com, which is the developer’s website run by Antibody Software Limited.

Several third-party download sites redistribute WizTree, and some bundle it with unwanted adware installers. Sites like Softpedia and MajorGeeks generally provide clean mirrors, but the safest option is always the official source. The current version 4.30 (released March 2026) is available as both a standard installer (~5 MB) and a portable ZIP (~7 MB). Both are identical in functionality.

1. Visit diskanalyzer.com or use our download section for a direct link
2. Choose between the installer (.exe) or portable (.zip) version
3. After downloading, verify the file size matches (~5 MB for installer, ~7 MB for portable)
4. Check the digital signature before running: right-click the file, Properties, Digital Signatures tab

Pro tip: Bookmark the official diskanalyzer.com URL. A Google search for “WizTree download” sometimes surfaces SEO-spam sites that rank above the real page. Our download section links directly to the genuine file.

For step-by-step installation instructions after downloading, check our Getting Started guide.

WizTree is completely free from malware and spyware when downloaded from the official source at diskanalyzer.com.

The program runs entirely offline once installed. It does not collect usage telemetry, file metadata, or personal information. Your disk scan results stay on your machine. WizTree reads the NTFS Master File Table (MFT) to build its file listing, and this process happens entirely within your local operating system. No network connections are made during scanning. The only outbound connection WizTree makes is an optional update check on startup, which you can disable in Settings.

• No telemetry or analytics are sent to any server during or after scans
• No background processes remain running after you close WizTree
• The portable version writes zero data to your Windows registry
• If you use the installer version, uninstalling through Programs and Features removes all traces

Pro tip: On Reddit’s r/sysadmin and r/msp communities, WizTree is one of the most recommended disk analysis tools for enterprise use precisely because it has no phoning-home behavior. Multiple sysadmins have packet-captured its network activity and confirmed zero data exfiltration.

Read more about WizTree’s features and how it works in our features section.

Yes, WizTree works on Windows 11 with full compatibility. Version 4.30 runs on all Windows 11 builds including 23H2 and 24H2.

WizTree supports Windows 7, 8, 8.1, 10, and 11 across both 32-bit and 64-bit architectures. On Windows 11, the MFT-based scanning method works the same as on older versions. You will get the full speed benefit of direct MFT reads on NTFS drives, typically scanning a 1 TB SSD in under 5 seconds. For ARM-based Windows 11 devices (like Surface Pro X), WizTree runs through the x86 emulation layer without issues, though MFT scanning still requires NTFS-formatted drives.

• Windows 11 Home, Pro, Enterprise, and Education editions are all supported
• UAC will prompt you for admin rights on first launch — accept this for full scanning capability
• If running without admin privileges, some system folders will show 0 bytes or be missing from results

Pro tip: On Windows 11, pin WizTree to the Start menu and set it to “Run as administrator” by default. Right-click the shortcut, go to Properties, Advanced, and check “Run as administrator.” This prevents incomplete scan results caused by permission issues.

For full hardware and software requirements, see our system requirements section.

WizTree has very light system requirements. Any computer that runs Windows 7 or newer can run WizTree without trouble.

The application uses roughly 50-100 MB of RAM during a typical scan of a 1 TB drive. CPU usage spikes briefly while reading the MFT but drops to near zero once the scan completes and WizTree is just displaying results. You need about 15 MB of free disk space for the installed version. There are no GPU requirements, no .NET framework dependencies, and no runtime libraries to install separately. WizTree 4.30 is a standalone application that bundles everything it needs.

• OS: Windows 7, 8, 8.1, 10, or 11 (32-bit or 64-bit)
• RAM: 128 MB minimum (512 MB recommended for drives with millions of files)
• Disk space: 15 MB for installation, or 7 MB for the portable ZIP
• CPU: Any processor from the last 15 years will work
• Admin rights: Recommended for full NTFS MFT access on local drives

Pro tip: If you are scanning a drive with over 10 million files (common on file servers), expect WizTree to use 200-400 MB of RAM. This is still far less than WinDirStat, which can consume over 1 GB on the same drive.

Check our detailed system requirements table for minimum and recommended specs.

No, WizTree is a Windows-only application. There are no native macOS or Linux versions available.

WizTree’s speed advantage comes from directly reading the Windows NTFS Master File Table, which is a Windows-specific filesystem structure. This technique does not translate to macOS (which uses APFS or HFS+) or Linux (which uses ext4, Btrfs, or XFS). Some users have reported running WizTree through Wine on Linux, but MFT access does not work in that environment, so WizTree falls back to the slower standard file-walking method. At that point, you lose the main speed advantage.

• macOS alternatives: DaisyDisk, GrandPerspective, or the built-in Storage Management tool
• Linux alternatives: Baobab (GNOME Disk Usage Analyzer), ncdu, or QDirStat
• If you need to analyze an NTFS drive from Linux, mount it and use QDirStat — or temporarily connect it to a Windows machine and use WizTree there

Pro tip: If you manage both Windows and Linux servers, use ncdu on your Linux boxes and WizTree on Windows. Both are fast, lightweight, and operate from the terminal or GUI respectively. Together they cover all your disk analysis needs.

See how WizTree stacks up against other tools in our features overview.

WizTree is free for personal and home use. If you are using it at work or in a business setting, you need a paid license.

The free version has no feature restrictions, no time limits, and no nag screens. You get the full application with MFT scanning, treemap visualization, tree view, file type breakdown, duplicate finder, and export features. The only difference between free and paid is the license terms: personal use is free, while commercial and enterprise use requires a license starting at $12 USD per user. Volume discounts are available for organizations buying 10 or more licenses through the official site at diskanalyzer.com.

• Personal/home use: completely free, no restrictions
• Commercial/business use: paid license required ($12+ per user)
• Educational institutions: contact Antibody Software for academic pricing
• No trial period or expiration on the free version

Pro tip: If you are a freelancer or independent contractor, the personal license covers you as long as you are using WizTree on your own personal machine. The commercial license applies when the software is installed on company-owned hardware or used as part of a paid service.

Download the free version from our download section to get started.

The free and paid versions of WizTree have identical features. The paid license is about commercial usage rights, not extra functionality.

Both versions include MFT-based NTFS scanning, the treemap visualization, tree view and file view tabs, file type statistics, duplicate file detection, CSV export, command-line support, and the ability to scan network drives. Antibody Software does not lock any features behind the paywall. The paid license ($12 per user) simply grants legal permission to use WizTree in a commercial, government, or enterprise environment. Some organizations require proof of valid licensing for compliance audits, and the paid license covers that.

• Free version: all features, personal use only
• Paid version: all features (same), licensed for commercial use
• No “Pro” or “Premium” tier with hidden features
• Updates are free for both versions

Pro tip: If you are an MSP (managed service provider) deploying WizTree across client machines, Antibody Software offers site licenses. Reach out through their contact page at diskanalyzer.com for bulk pricing. Many MSPs on Reddit’s r/msp use WizTree as a standard part of their toolkit.

Learn about all the features included in both versions on our features page.

Installing WizTree takes about 60 seconds. Download the installer from the official source, run it, and you are done.

The WizTree 4.30 installer is approximately 5 MB, so the download finishes almost instantly on any broadband connection. The installer uses a standard Windows setup wizard with no bundled adware or toolbar offers. You do not need to disable anything or uncheck hidden boxes during installation. The setup writes to Program Files and creates a Start Menu shortcut by default.

1. Go to our download section and click the WizTree download button
2. Open the downloaded .exe file (wiztree_4_30_setup.exe)
3. If Windows SmartScreen appears, click “More info” and then “Run anyway”
4. Accept the license agreement and click “Next”
5. Choose an install location (default is fine for most users) and click “Install”
6. Click “Finish” — WizTree will launch automatically
7. On first run, UAC will ask for admin rights. Click “Yes” to allow full disk scanning

Pro tip: If you are deploying WizTree across multiple machines in an enterprise, use the portable ZIP instead. Extract it to a shared network folder and run it directly — no installation required on each machine.

For configuration tips after installation, see our Getting Started guide.

Choose the portable version if you want zero system footprint. Choose the installer if you want Start Menu integration and automatic file associations.

The portable version (~7 MB ZIP) runs from any folder, USB drive, or network share without writing to the Windows registry or Program Files. It is the preferred choice for IT professionals who carry a USB toolkit. The installer version (~5 MB) is smaller because it compresses during setup, and it creates Start Menu shortcuts, optional desktop icons, and right-click context menu entries for drives. Both versions are functionally identical — same scanning speed, same features, same MFT access.

• Portable: no installation, no registry changes, runs from USB drives, ideal for tech support visits
• Installer: Start Menu shortcut, context menu integration (“Scan with WizTree” on drive right-click), auto-updater
• Both require admin rights for MFT scanning (portable will still prompt UAC)
• Both support command-line arguments for scripted scanning

Pro tip: Keep the portable version on a USB stick alongside other tools like CrystalDiskInfo, HWiNFO, and Autoruns. When you sit down at someone’s computer to diagnose disk space issues, you can scan the drive in seconds without installing anything.

Download either version from our download section.

Most WizTree installation errors come from Windows SmartScreen blocks, antivirus interference, or insufficient permissions. All three are straightforward to fix.

Because WizTree is published by a smaller company (Antibody Software Limited), Windows SmartScreen sometimes flags the installer as “unrecognized.” This is not a virus warning — it just means Microsoft has not catalogued enough downloads to auto-trust it. Similarly, some aggressive antivirus products quarantine the installer before you can run it because the MFT reading code triggers heuristic detection.

1. SmartScreen block: Click “More info” on the blue dialog, then click “Run anyway.” The publisher should show “Antibody Software Limited”
2. Antivirus quarantine: Add an exception for the WizTree installer in your antivirus settings, then re-download and run it
3. Permission errors: Right-click the installer and select “Run as administrator”
4. Corrupted download: Delete the file and download again from the official source. Verify the file size is approximately 5 MB
5. Older Windows versions: On Windows 7, make sure Service Pack 1 is installed. WizTree 4.30 requires SP1 as a minimum

Pro tip: If your organization uses group policies that block unsigned executables, ask your IT department to whitelist WizTree’s digital signature (publisher: Antibody Software Limited). Alternatively, use the portable ZIP, which bypasses installer-specific group policy restrictions.

Still stuck? Walk through our detailed Getting Started guide for more troubleshooting steps.

If WizTree refuses to open or freezes during a scan, the most common cause is an antivirus conflict or a corrupted installation. Both are easy to resolve.

WizTree accesses low-level disk structures (the NTFS MFT), which some security software treats as suspicious behavior. This can cause the application to hang during launch or mid-scan. On rare occasions, a corrupted settings file from a previous version can prevent WizTree from starting properly. Users on Reddit have also reported freezing when scanning certain network-mapped drives or MTP-connected phones, which WizTree was not designed to handle.

1. Antivirus conflict: Temporarily disable real-time scanning, then launch WizTree. If it works, add WizTree to your antivirus exclusion list
2. Corrupted settings: Delete the file WizTree64.ini (or WizTree.ini for 32-bit) from the installation folder, then relaunch
3. Outdated version: Uninstall the current version and install the latest 4.30 from our download section
4. Network drive freeze: If scanning a network path, switch to scanning local drives only. Network shares use the slower file-walk method and can stall on unreliable connections
5. Permission issue: Make sure you are running WizTree as administrator. Without admin rights, MFT access fails silently and the scan may appear stuck

Pro tip: If WizTree hangs specifically when scanning one drive, run chkdsk /f on that drive from an elevated Command Prompt. File system errors can cause the MFT read to stall indefinitely.

For general setup help, see our Getting Started guide.

WizTree often shows less used space than Windows Explorer because certain system-reserved data is not counted as regular files. This is normal and not a bug.

Windows tracks total used space at the volume level, which includes hidden system data that WizTree cannot enumerate as named files. The discrepancy is usually 2-15 GB on a typical system drive and can be much larger on drives with extensive System Restore history. WizTree shows you what it can see through the MFT — actual files and folders with names and paths. The “missing” space sits in areas that are invisible to file-level tools.

• System Restore points: Can consume 10+ GB, invisible to WizTree. Manage through System Properties or vssadmin list shadowstorage
• Hibernation file (hiberfil.sys): Equal to your RAM size. Run powercfg /h off to reclaim it if you do not use hibernate
• Page file (pagefile.sys): Typically 4-16 GB. WizTree may show it but Windows sometimes reports space differently
• NTFS slack space: Small files consume a full cluster (usually 4 KB) even if the file is only a few bytes
• MFT reserved zone: NTFS reserves 12.5% of the MFT by default, which uses disk space but does not show as files

Pro tip: Run WizTree as administrator and enable “Show free space” in the options to see a more complete picture. For the remaining gap, run Windows Disk Cleanup with “Clean up system files” to see exactly what system data is consuming space.

Check our features section to learn more about how WizTree reads disk data.

If WizTree stops scanning partway through a drive, the cause is almost always a permissions issue, a file system error, or antivirus interference.

Users on Reddit (r/sysadmin, r/techsupport) have reported scans stopping at a fixed number of files and folders, with the application still responsive but no longer adding new entries. This happens most often when scanning external drives, USB-connected volumes, or network-mapped paths. On local NTFS drives, incomplete scans typically mean WizTree could not read certain MFT entries due to corruption or access restrictions.

1. Run as administrator: This is the single most common fix. Without admin rights, WizTree cannot access all MFT entries and will skip protected system folders
2. Check disk health: Open an elevated Command Prompt and run chkdsk X: /f (replace X with your drive letter). Fix any errors, then rescan
3. Disable antivirus temporarily: Some AV products intercept MFT reads and cause WizTree to stall. Add WizTree.exe to your exclusion list
4. Non-NTFS drives: If the drive uses FAT32 or exFAT, WizTree falls back to standard file walking, which is slower and may behave differently
5. MTP/phone storage: WizTree cannot reliably scan phones connected via MTP. The protocol does not expose real file sizes consistently

Pro tip: If the scan works fine on C: but fails on an external drive, try connecting that drive via a different USB port or cable. Flaky USB connections can cause mid-scan read failures that look like a WizTree bug.

Learn more about supported drive types in our system requirements section.

Download the latest version from diskanalyzer.com and install it over the existing one. You do not need to uninstall the old version first.

WizTree 4.30 (released March 2026) is the current version. The installer automatically detects an older installation and upgrades it in place, keeping your settings and preferences intact. If you are using the portable version, download the new ZIP, extract it to the same folder, and overwrite the old files. Your scan history and custom settings are stored in the .ini file, which is preserved during both upgrade methods.

1. Open WizTree and go to Help > Check for Updates to see if a newer version is available
2. If an update exists, you will be directed to the download page at diskanalyzer.com
3. Download the new installer and run it — it handles the upgrade automatically
4. For portable users: download the new ZIP and extract over the existing folder

Pro tip: WizTree checks for updates automatically on startup by default. If you are behind a corporate proxy or firewall that blocks this check, you can disable it in Settings and manually check diskanalyzer.com periodically. Major version updates typically add new scan modes or performance improvements that are worth grabbing promptly.

Grab the latest version from our download section.

WizTree 4.30 was released in March 2026 and includes performance improvements, UI refinements, and expanded duplicate file detection.

The developer at Antibody Software publishes a changelog for every release on the official site. Version 4.x brought major additions including a built-in duplicate file finder, improved handling of very large drives (4+ TB), better treemap rendering performance, and expanded command-line options for automated scanning. Earlier 4.x releases also added dark mode support, improved high-DPI scaling for 4K monitors, and faster CSV export for drives with millions of files.

• Duplicate file detection built directly into the scan results
• Faster treemap rendering for drives with 5+ million files
• Improved memory usage on large RAID arrays and NAS volumes
• Dark mode support for late-night disk cleanup sessions
• Better handling of junction points and symbolic links
• Expanded command-line switches for scripted/automated scanning

Pro tip: Check the full changelog at diskanalyzer.com before updating if you rely on specific behavior in production scripts. New versions occasionally change command-line output formatting, which can break automated parsing.

See our features section for a detailed breakdown of WizTree’s capabilities.

WizTree is significantly faster than WinDirStat on NTFS drives. WinDirStat is fully open-source. Your choice depends on whether speed or licensing matters more.

WizTree scans a 1 TB NTFS SSD in under 5 seconds by reading the Master File Table directly. WinDirStat (even the updated 2.2.0 version from January 2025) walks the file system the traditional way, which takes 30 seconds to 2 minutes on the same drive. On spinning hard drives, the gap widens to 20-50x. WinDirStat made major performance improvements in its 2.0 and 2.2 releases after a 19-year gap between updates, but it still cannot match MFT-based scanning speed. Both tools show treemap visualizations and directory trees. WinDirStat adds extension statistics and a “Largest Files” tab in its newest versions.

• Speed: WizTree wins by a wide margin (3-5 seconds vs 30-120 seconds on a 1 TB SSD)
• License: WinDirStat is GPLv2 open source, WizTree is free for personal use only
• Features: Both have treemaps, WizTree adds duplicate finder, WinDirStat adds extension stats
• RAM usage: WizTree uses less memory (50-100 MB vs 200-500 MB on typical drives)
• Non-NTFS drives: Both perform similarly since MFT reading is not available

Pro tip: If you work in an environment where only open-source software is approved, WinDirStat is your pick. For everything else, WizTree’s speed advantage is hard to ignore. Many sysadmins keep both installed and default to WizTree for NTFS local drives.

Download WizTree and try it yourself from our download section.

The most commonly recommended alternatives to WizTree are WinDirStat, TreeSize, SpaceSniffer, and the built-in Windows Storage Settings.

Each tool has a different strength. TreeSize (by JAM Software) offers a polished professional interface and is popular in corporate environments. SpaceSniffer provides real-time animated treemap scans. WinDirStat is the go-to open-source option. Windows 10 and 11 include a built-in Storage section (Settings > System > Storage) that handles basic disk cleanup without installing anything. On macOS, DaisyDisk and GrandPerspective fill the same role. On Linux, ncdu and QDirStat are the equivalents.

• TreeSize Free: Good treemap, slower than WizTree, free version available, more polished UI
• WinDirStat 2.2: Open source, recently updated, decent speed on SSDs, extension statistics
• SpaceSniffer: Animated treemap, portable, no longer actively developed
• Windows Storage Settings: Built-in, no install required, limited but handles basic cleanup
• Everything (by voidtools): Not a disk analyzer but searches by filename instantly — great companion to WizTree

Pro tip: Pair WizTree with “Everything” by voidtools. Use WizTree to find which folders are large, then use Everything to instantly search within those folders by filename. Together they cover disk analysis and file search in under 10 seconds.

See how WizTree compares on speed and features in our features section.

Yes, WizTree supports a full set of command-line arguments for automated and scripted disk analysis. You can scan drives, export results to CSV, and filter by file types without opening the GUI.

The command-line interface is particularly useful for system administrators who need to generate disk usage reports across multiple machines. You can run WizTree from a batch file, PowerShell script, or scheduled task. The CSV export includes full path, file size, allocated size, modification date, and attributes for every file and folder on the drive. This data is easy to import into Excel, Power BI, or any analysis tool.

• WizTree64.exe C:\ — scan the C: drive and display the GUI with results
• WizTree64.exe C:\ /export="C:\reports\disk_c.csv" — scan and export to CSV silently
• WizTree64.exe C:\ /filter="*.log" — scan and filter results to show only .log files
• WizTree64.exe C:\ /export="report.csv" /admin=1 — request admin elevation for full MFT access
• WizTree64.exe /scanall — scan all connected local drives at once

Pro tip: Create a Windows Scheduled Task that runs WizTree with the /export flag weekly. Save reports to a shared folder so you can track disk usage trends over time. Compare CSV files from different weeks using a simple PowerShell diff script to spot rapid growth in specific directories.

For more setup and configuration guidance, see our Getting Started guide.

WizTree includes a built-in duplicate file finder that compares files by hash value. Open WizTree, scan a drive, then switch to the duplicate detection mode in the File View tab.

The duplicate finder groups files with identical content together regardless of filename or location. It uses file size as a first-pass filter (files must match size exactly before hash comparison begins), which keeps the process fast even on large drives. On a 1 TB SSD with 500,000 files, duplicate detection typically completes in under 30 seconds after the initial MFT scan. The results show each duplicate group with the total wasted space calculated, so you can prioritize which duplicates to address first.

1. Open WizTree and scan the drive you want to check
2. Click the “File View” tab at the top to see individual files
3. Sort by the hash column or use the duplicate filter option to group identical files together
4. Review each duplicate group — WizTree shows full paths so you can decide which copies to keep
5. Right-click a file and select “Open in Explorer” to navigate directly to the duplicate
6. Delete unwanted copies manually or mark them for batch removal

Pro tip: Before deleting duplicates, sort by folder path. Duplicates in your Downloads folder are almost always safe to remove. Duplicates inside Program Files or Windows folders should be left alone — they are often hardlinks or shared DLLs that look like duplicates but serve a purpose.

Learn about all of WizTree’s analysis capabilities in our features section.