The main window is split into the file system tree on the left and the details view on the right.
Details view offers valuable information about the disk usage like the folder size, the disk space wasted due to the file system structure, the last access date, the NTFS compression rate and the owner.
The tree map is an hierarchical chart visualizing the size of all subfolders.
Treesize Professional can scan Mobile Devices via MTP
The pie chart and bar chart provide a quick overview over the disk space usage
The TreeSize file search helps you to find obsolete and very large files
TreeSize enables you to sort files by file age
TreeSize enables you to save file system branch information to an XML file or to take a snapshot of the disk space usage at a certain point in time
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TreeSize Features

  1.  Portable
  2.  Ad-free
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TreeSize information

Supported Languages

  • English
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Our users have written 18 comments and reviews about TreeSize, and it has gotten 277 likes

TreeSize was added to AlternativeTo by Ola Johansson on Apr 22, 2009 and this page was last updated May 18, 2023.

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Top positive commentApr 26, 2015

I have loved, and continue to love, TreeSize Free for many, many years (more than 10 years and counting). Whenever I get a new computer it is one of the first things I install.

It is simple, fast and unbloated. So many disk usage analytic tools waste their efforts on fancy looking charts but don't help the user with their most essential goal - to quickly identify exactly what is using the most space on their storage device.

TreeSize Free, however, excels at this. It quickly analyzes your hard drive (for example, one of my drives had over 480,000 files using over 950G of space, TS Free analyzed the entire drive in under 20 seconds). It presents your entire drive as an interactive tree sorted by file size (or even file counts, if you prefer), allowing you to expand or collapse each directory so you can quickly zoom in on exactly what you need to remove in order to free up the most space in the shortest amount of time.

As an example, I launched TS Free on one of my computers. This one has a 1TB drive but less than 60G free space remaining. I knew it had lots of downloads and photos - but not that much! What was taking up so much space?? It took TS Free 17 seconds to analyze this drive. Right away the problem is revealed - over 460G is consumed by 18 files in "C:\System Volume Information". After a quick online search I found that these are system restore points, and the amount of space they occupy is configurable via the system protection utility in W7 (but that's a topic for another day). All I had to do was adjust the system protection options to reduce the restore point disk consumption. But the important point here is that I quickly got to this solution with excellent assistance from TreeSize Free.

The biggest limitation of the free version (AFAIK) is that it won't analyze network drives. That hasn't been a big issue for me, so I haven't had to opt for the Pro version.

[Edited by rmbjr60, April 26]

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Top positive commentMay 20, 2022

I've used it for years for cleaning my PC. It's easy and powerful. Best tool for manual cleaning or just to see what clutters your drive.

Does exactly what WinDirStat, but much faster. The free version was enough for me.

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Top negative commentOct 2, 2014

Crashes everytime I use it (and I have plenty of RAM). Version is older version, but I got tired of developer constantly hitting up for more $$$ for additional updates that don't fix anything.

1 reply

Try the free version (TreeSize Free), it is awesome and does not hit up for $$$, ever. The biggest limitation in the free version is that it doesn't support network drives. If that's a limitation you can live with, then definitely try the free version.

Reply written Apr 26, 2015

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Positive commentSep 18, 2021
• Edited Sep 18, 2021

While I always had problems with WinDir Stat crashing when scanning large directories, the free, portable version of TreeSize completed the same task without any issues and quickly too (3+ TB with 80K files in less than a minute)

Using this I managed to clean up my external harddrive from things I didn't remember having on it, very handy.

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Positive commentJun 25, 2021

My #1 Disc Space Analyzer was, is and it seems it will always be SpaceSniffer. The main reason is because I love how it graphically shows me what takes my space, which is way more easy to "see" what takes up my space, rather than looking at numbers, percentages and pie charts.

Still though, TreeSize is perfect when you actually want the numbers, rather than just shapes, where you want to know the exact Folder Size in your storage space. So I use TreeSize for the times I wish Windows offered the option to switch Folder Size on and off, so you can tell how much size you different folders take up, while you are browsing through your stuff.

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Positive commentJul 17, 2020

The Best disk space analyser !

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Negative commentSep 26, 2019

Freemium such as only pro users can scan mapped network volumes , slow speed

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