FAQs & Knowledge Base

Welcome to our Knowledge Base. Search or browse through the topics below to find answers to your questions.

Categories: TreeSize Free | Show all categories

There is no need to reinstall TreeSize Free in order to change the setting for the Windows Explorer's context menu.

On the 'Options' tab, you can simply change the option at runtime.

Since Windows Vista and later, Microsoft enforces more strict security rules on the operating system. One side effect of this is that you may not see your mapped network drives anymore (Windows 8 and later), or they all appear disconnected (typically in Windows Vista and 7) in all applications that run with administrator privileges.

This is because Windows uses different user environments for non-elevated and elevated processes. There are some workarounds to gain access to those network drives anyway:

  • Do not run TreeSize as administrator unless it is truly needed.
  • Manually enter the UNC path (e.g. "\\server\share") for the network drive into the path drop-down list or target selection dialog and press enter.
  • Map the network drive in the context of the administrator using an elevated command prompt (run CMD as administrator). You can list the mapped drives using net use
    Type net use /? for more instructions on how to map the drive.
  • [Professional/Personal only] Use the "Map network drive" or "Add drive or UNC path" dialog from the Drive List menu bar.
  • [Not recommended because of security bypasses!] Enable "Linked Connections" as described here.

Yes, TreeSize Free may be used in commercial and enterprise environments. TreeSize Free has the limitation that it cannot scan network drives in Windows domains, this is only possible with the Professional edition.

However, please consider purchasing a few licenses of TreeSize Professional to support the further development of all editions.

Differences to the size shown in Windows Explorer can occur because the free version does not take all NTFS-specific features into account.

Features like Alternate Data Streams (ADS), Deduplication (Windows Server 2012 and above) or recognition of hardlinks are not evaluated in TreeSize Free. The personal and professional edition come with an option to explicitly analyze these extended NTFS features, which may make the results more accurate.

Starting TreeSize Free "as administrator" will show larger parts of the disk that cannot be accessed by "normal" users.

Unfortunately, the previously used UPX compression no longer works under 64-bit. Therefore, the executable file in the 64-bit version is significantly larger than that of the 32-bit version.
One way to fix this is to enable NTFS formatting for the file or to use Windows' own compression (available from Windows 10).

You can find a list of legacy TreeSize Free versions for operating systems that are no longer supported with the latest releases on the bottom of our productpage.

The reason why PDF files cannot be opened is because Adobe Acrobate Reader is preventing to open files from an application with administrator rights via its Protected Mode. To solve this issue disable protected mode by doing the following:

  1. Open Adobe Reader.
  2. Choose Edit > Preferences...
  3. In the Categories list on the left, select Security (Enhanced).
  4. In the Sandbox Protections section, deselect Enable Protected Mode at startup.
  5. Click OK to save the changes.
  6. Close Adobe Reader.


For more information about Protected Mode (and possible vulnerabilities) refer to the Adobe website.

One possibility why the total size displayed by Tree is that not all parts of the drive could be scanned due to access restrictions. Therefore it is highly recommended to run TreeSize as administrator.

Please make sure that you have the view option "Allocated Space" activated when you are interested in the physically allocated space.

Another possibilty has been introduced with Windows 10 version 1903, the system reserverd storage. This space occupies about 7 GB by default and is used by Windows exclusively. It is not visible to other applications and currently not represented with the scan.

Windows 7 support was discontinued with the release of TreeSize Free v4.5.0.

The last version of TreeSize Free compatible with Windows 7 can be found here: TreeSize Free v4.4.2

TreeSize Free v4.5 is compatible with:

  • Windows 11
  • Windows 10
  • Windows 8.1
  • Windows 8
  • Windows Server 2022
  • Windows Server 2019
  • Windows Server 2016
  • Windows Server 2012 R2
  • Windows Server 2012

We offer versions for older Windows versions for download on the product page:

  • TreeSize Free v4.4.2 for Windows Vista/Windows 7
  • TreeSize Free v3.4.5 for Windows XP
  • TreeSize Free v2.4 for Windows 2000
  • TreeSize Free v2.1 for Windows 95/98/ME

All entries (Page 1 / 3)