The Powerful Graphical Manager For Your Storage Systems

  • Analyze Data On Any Storage System
  • Visualize The Usage of Storage Capacities
  • Organize And Clean Up Storage Systems Efficiently

Keeping track of disk space and tidying it up

With TreeSize, you can analyze your most important storage systems and directly manage and clean up your files. You can evaluate space usage with statistics and charts, create reports or search for old or duplicate files based on specific criteria – manually, or automatically according to a schedule.

TreeSize can move, archive, delete, but also bulk rename files across systems and much more. Organizing and cleaning up has never been easier.

Benefit from our experience as market leader – TreeSize has been cleaning up hard drives since 1997!

Cross-system Disk Space Management
Scan Windows, WebDAV, and SharePoint servers, any mobile devices, Amazon S3, and Unix/Linux systems via SSH! See the size of all folders including subfolders and break it down to the file level.
Highly Customizable File Search
Search for files and folders using a number of different criteria. Archive, copy or move the found results! Check for duplicate files using a powerful duplicate file search, optionally with MD5 or SHA256 checksums and easily deduplicate files using hardlinks.
Versatile Exporting and Reporting
Export scan and search results to many formats such as Excel, XML, HTML, PDF, text/CSV file, clipboard, or email. You can also easily automate the exports using command line options.

Visual Tour

The main window offers a clear and easy to use interface which is split into the file system tree on the left and the details view on the right. An optional chart facilitates easy overview. 

The pie chart of TreeSize allows you to overview the most important data on disk space usage at one glance.

The treemap chart is a hierarchical chart visualizing the size of all subfolders (not only the direct child folder) of a selected directory branch. The tiles can be viewed in 2D (pictured) and 3D mode.

The Details view presents you a lot of valuable information about the disk usage like the folder size, the disk space wasted by the file system structure, the last access date, the NTFS compression rate and the owner.

TreeSize enables you to sort files by file age. Intervals can be configured for "creation date" , "last change" and "last access".

The top 100 panel provides an overview about the 100 largest files found during the last scan.

The TreeSize file search helps you to find obsolete and very large files. The particular search types can be configured in detail and certain files or folders can be easily excluded from the search results - for instance recently changed files.

Configure TreeSize: Many aspects of TreeSize can be configured in the options dialog, e.g. the view, the export of data or startup options.


I LOVE the product and we use it daily for not only reporting but for administering our CIFS environment. *Honestly I'm probably doing more with the product than you intended but it has been a life-saver for my department.

Shelly Birkla, Storage Services, University of Notre Dame

Thank you for the ongoing support for TreeSize. Just yesterday I was able to demonstrate that a certain action of just manually updating a set of excel files would be a near impossible task since I was able to show them in less than 10 min that they had over 20.000 excels hidden in their networkshare.

The simplicity and speed is just awsome!

Manfred De Jong, Manfred De Jong Consultancy

Very glad I bought the software yesterday! I've seen my software company's support staff use Treesize. I'm personally always pretty hesitant about purchasing software. But after trying out the trial... MAN! It's night and day difference when compared to Windirstat.

The speed difference alone is incredible!

Thibault Molleman, Molleman De Coster BVBA

I've just tried a scan on a large bucket and it reported the results far quicker than I can get the results directly from the aws console!! Great work!! Amazing.

I remain super impressed with your work, thanks loads.

Charlie Daffarn, Omnicom Group IT | paige

TreeSize Professional from JAM Software is the most powerful program I’ve seen for analyzing how disk space is being used. My local hard drive, which is partitioned as a main C: partition and a supplementary D: partition, has almost 450,000 files using 665GB. The scan completed in 37 seconds!

Read the complete review.

Chris Taylor, President and System Administrator, Ottawa PC Users' Group

Which is the right edition for you?

When it comes to managing storage space, one size does not fit all. That's why we offer different editions for different requirement - no matter if you are working with a personal computer or a whole server landscape.

Compare our disk space managers
* Perpetual licenses, no subscriptions

Many visualizations to break down disk space usage


Support for network drives in Windows corporate networks


Automation options


Automatic and permanent storage of data


Recommended for very large directory trees and large server landscapes


TreeSize for beginners

Are you new to TreeSize or want to use TreeSize besides? With the TreeSize Simple Mode and First Run Wizard, we make it easier than ever getting started with TreeSize - even for casual users.

The Simple Mode tailors TreeSize to the most important features while the Wizard guides you through the program after first start! Try it now!

Compatibility & Supported Languages

TreeSize is compatible with all Windows systems currently supported by Microsoft and supports numerous languages in addition to English and German.

More Information and Documents

Important and valuable information about TreeSize, be it a successful application in practice, maintenance questions or technical specifications.