SoftNexi

Windows · System & Disk Utilities

TreeSize Free for Windows

Free disk-space analyzer from JAM Software that shows folder sizes in a sortable tree so you can find what's actually filling a drive.

Updated August 9, 2026 · Reviewed by SoftNexi Editorial Team, Software research and documentation

Download

Overview

TreeSize Free scans a drive or folder and presents sizes as a sortable, expandable tree in an interface that looks and works like Windows Explorer, which makes it fast to pick up. It answers the question Explorer can't easily answer on its own: which folder is actually using the space.

It's a scaled-down version of JAM Software's paid TreeSize Professional, which adds scheduled scans, NTFS compression reporting, and enterprise reporting features. The free edition covers what most home users need: a scan, a sorted list, and the ability to jump straight to a folder or delete from within the tool.

TreeSize Free integrates into the Windows Explorer right-click menu, so you can right-click any drive or folder and get an instant size breakdown without opening a separate app first.

It shows what's taking space; it doesn't identify duplicate files or safely categorize junk the way a dedicated cleanup tool does — pair it with something like WizTree for faster scans on very large drives, or BleachBit for actual cleanup.

Key features

  • Explorer-style expandable tree of folder sizes
  • Right-click 'TreeSize' entry added to Windows Explorer
  • Sort by size, file count, or last modified date
  • Bar-chart visualization alongside the numeric tree
  • Direct delete, move, or open-in-Explorer actions from within scan results
  • Command-line scanning option for scripted use

System requirements

Operating system
Windows 11 and Windows 10 (older Windows releases also supported)
Architecture
x64 or x86 installer
Permissions
Administrator rights recommended for scanning system and other users' folders

How to install TreeSize Free

  1. 1. Download from JAM Software

    Get the installer from jam-software.com/treesize_free.

  2. 2. Install

    Run the installer; approve the UAC prompt to enable full-drive scanning and Explorer context menu integration.

  3. 3. Confirm Explorer integration

    Right-click a drive or folder in Windows Explorer and check for the TreeSize entry in the context menu.

How to use it

  1. 1. Scan a drive

    Right-click your C: drive (or any folder) and choose 'TreeSize' to get an instant size breakdown, largest folders first.

  2. 2. Drill into the tree

    Expand large folders in the tree view to narrow down exactly which subfolder is using the space.

  3. 3. Sort by last modified

    Switch the sort column to last-modified date to spot large, old, and likely forgotten folders.

  4. 4. Clean up directly

    Right-click an oversized folder in the results to delete or move it without switching back to Explorer.

Safety and privacy

  • Download only from jam-software.com; the tool is sometimes bundled with extras on third-party portals.
  • TreeSize Free only reads and reports; any deletion happens through explicit action you take within the tool.
Bundled software
The official installer from JAM Software's own site does not bundle third-party offers.
Privacy
Runs locally against your file system; no account or cloud upload is required for scanning.

Known risks

  • As with any file browser that offers a delete action, double-check a folder's contents before removing it — TreeSize shows size, not whether a file is safe to delete.

What's new

  • Current release series

    JAM Software updates TreeSize Free periodically alongside the Professional edition. Check the developer's download page for the current version notes.

Pros and cons

Pros

  • Free edition covers the core need: finding what's using disk space
  • Familiar Explorer-style interface with minimal learning curve
  • Direct right-click Explorer integration
  • Can act on results (delete, move) without leaving the tool

Cons

  • Scans of very large or heavily fragmented drives are slower than tools purpose-built for speed
  • No duplicate-file detection
  • Advanced reporting and scheduling are Professional-only

Verdict

TreeSize Free is a dependable, no-nonsense way to see where disk space actually goes, with an interface that needs no learning curve if you already know Explorer. If scan speed on huge drives matters more than reporting depth, also try WizTree.

Frequently asked questions

Is TreeSize Free actually free?

Yes, the free edition has no time limit. JAM Software also sells a Professional edition with scheduling and reporting features aimed at IT administrators.

Does TreeSize Free delete files automatically?

No. It only reports sizes; any deletion is a manual action you take from within the results.

How is it different from WinDirStat?

Both show folder sizes in a tree, but TreeSize Free uses an Explorer-style list with an optional bar chart, while WinDirStat centers on a colorful treemap visualization.