# TreeSize

Application: JAM Software

Also called treesize free, treesize professional, jam treesize

JAM Software, System

A paid disk-space map from JAM Software. A free edition exists. The process is TreeSize.exe. It is not WinDirStat.

## What you need to know

TreeSize is JAM's disk map. WinDirStat is a different free treemap.

JAM Software TreeSize shows which folders use space. Free and paid editions exist. Get them from jam-software.com. It is not WinDirStat and it is not WizTree's MFT reader.

- **What is it?**: A disk-space map from JAM

  **Same as WinDirStat?**: No. Different product and license

  **Is there a free build?**: Yes. TreeSize Free exists

Feex says

If you need a folder-size tree and your shop already bought JAM, that is TreeSize. If you wanted a free treemap, I would open WinDirStat or WizTree instead of paying on the first day.

## What is TreeSize?

TreeSize is JAM's folder-size scanner. TreeSize.exe is the paid family. TreeSize Free is a separate download. WinDirStat is a different treemap project.

## If you have never used it

If a drive is full and you want a licensed folder map, TreeSize is JAM Software's disk-space tool. The free edition exists. Paid TreeSize adds more views and reports. Download it from jam-software.com. It is not WinDirStat, not WizTree, and not Storage Sense.

## What is it used for?

**See which folders eat the drive**

Scan a drive or a share. The tree of sizes is the product. WinDirStat draws a treemap instead of JAM's paid reports.

**Export and schedule on paid SKUs**

Professional adds reports and file-search extras. That is why shops pay. WizTree is not this license.

**Free edition for a one-off look**

TreeSize Free is enough for a home PC. It is still TreeSize, not windirstat.exe.

## Who is it for?

- Admins who want a licensed disk map
- Home users who grabbed TreeSize Free
- Anyone comparing this to WinDirStat or WizTree

## Current status

TreeSize (1996) is a current disk space analyzer from JAM Software. The vendor still points Windows users at https://www.jam-software.com/treesize.

## How old is it?

TreeSize dates to 1996. It is older than WinDirStat (2003) and much older than WizTree (2016). JAM still sells current Windows builds. A Windows 95 screenshot is history.

## Versions

Major channels first. Exact build numbers are not all verified here.

TreeSize Free

TreeSize Personal

TreeSize Professional

## System requirements

Values follow the publisher's public guidance. Workload still changes the real need.

### Minimum

| Operating system | Windows 10 or Windows 11, per JAM Software's current TreeSize pages |
| ---------------- | ------------------------------------------------------------------- |
| RAM              | Enough for Windows plus this app. Heavy projects want more.         |

## Resource profile

- **CPU demand**: Rises while walking the tree

  **Disk demand**: Lots of metadata reads during a scan

## Installed processes

These executables belong to this product when it is installed.

| TreeSize.exe     | Disk map window                          |
| ---------------- | ---------------------------------------- |
| TreeSizeFree.exe | Free edition image name on some installs |

## Startup components

TreeSize should not start with Windows unless you scheduled a paid scan.

## File locations

| Typical install | C:\Program Files\JAM Software\TreeSize\\ |
| --------------- | ---------------------------------------- |

## File formats

Exports reports on paid SKUs. It reads the file system

## Common problems

### Free versus paid confusion

TreeSize Free is not Professional. The Start tile and the license dialog name the SKU. WinDirStat has no JAM key.

### Slow scan on a huge network share

Permissions and latency cost time. WizTree's MFT shortcut does not apply the same way on a UNC path.

## Getting unstuck

### Download from jam-software.com, not a "TreeSize crack" host

JAM sells licenses. WinDirStat is the free treemap if you did not want to pay.

### Run as administrator if Program Files folders show as small

Access denied hides size. That is NTFS permissions, not a broken WizTree MFT read.

### Pick TreeSize Free if you only needed a one-off map

The free edition is enough for many home PCs. Professional is the paid product, not WinDirStat.

## Alternatives

WinDirStat for a classic free treemap. WizTree for a fast NTFS MFT scan. Storage Sense does not draw this map.

## Official help and downloads

Start with the vendor. Random exe sites are not a support channel.

| Download      | [www.jam-software.com/treesize ](https://www.jam-software.com/treesize)Official installer or vendor page |
| ------------- | -------------------------------------------------------------------------------------------------------- |
| Help          | [knowledgebase.jam-software.com/ ](https://knowledgebase.jam-software.com/)Vendor support                |
| Official site | [www.jam-software.com/treesize ](https://www.jam-software.com/treesize)Start here, not a random exe host |

## Related hardware

The scan reads the file system. An HDD feels slower than NVMe. That is the drive, not a GPU score.

## Technical details

Technical details

Vendor version numbers change. This article does not pin a build.

## Related

These entities connect to this article. Type is shown on every link.

[WizTree: Application](https://feex.it/wiki/software/wiztree)[WinDirStat: Application](https://feex.it/wiki/software/windirstat)[How to read Task Manager: Guide](https://feex.it/wiki/software/system/how-to-read-task-manager)

## Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. [How we research](https://feex.it/wiki/research).

- [TreeSize official site ](https://www.jam-software.com/treesize)· Vendor product page
- [TreeSize help ](https://knowledgebase.jam-software.com/)· Vendor support
- [TreeSize Free ](https://www.jam-software.com/treesize_free)· Free edition product page
- [Foxhole process map ](https://foxhole.feex.it/)· First-party samples on Windows PCs. Not a lab benchmark.

## Was this article useful?

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Quick facts

The short identity of this page. Specs, sources, and the full story stay in the article.

- **Developer**: JAM Software

  **Category**: Disk space analyzer

  **Process**: TreeSize.exe

  **License**: Free edition and paid Personal / Professional

  **First released**: 1996

  **Official site**: [jam-software.com/treesize](https://www.jam-software.com/treesize)

  **Mapped by Feex**: Seen on Windows PCs in Foxhole

Feex Reviewed: Last verified August 2026

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Source: [Canonical Feex Wiki page](https://feex.it/wiki/software/treesize/)

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