A free disk space analyzer for Windows. It scans a drive or folder and shows how much space every folder and file takes, so you can find what's filling up your SSD and clean it up.
No install, no account, no trial. One .exe.
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Fast parallel scan. All CPU cores walk the tree at once. A 1.7 TB drive with 1.6 million files scans in about 30 seconds the first time, and in a few seconds once Windows has the folders cached.
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Folder tree sorted biggest first, with size, a % of parent bar, file and folder counts, and last-modified date.
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Charts of the selected folder. Switch between:
- Bars: the biggest items ranked, with sizes and percentages
- Pie: each item's share of the folder
- Towers: the biggest items as columns
- Sunburst: rings showing what's inside each folder, three levels deep
- Treemap: every box is a folder or file, sized by the space it takes
Click anything in a chart to find it in the tree. Double-click a folder to zoom in, and use Up to zoom out. Drag the divider to give the chart more room.
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Largest files tab: the 500 biggest files on the scanned drive or folder.
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Cleanup: right-click anything to Show in Explorer, Copy path or Send to Recycle Bin. It asks you first, and it never deletes anything permanently.
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Export CSV of every folder with its size, for spreadsheets.
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Drive bar at the top shows free space on every drive. Click a drive to scan it.
Download foldersize.exe from Releases (or build it, see below) and run it. Click a drive, or Folder… to pick one.
You can also pass a path: foldersize.exe D:\Games.
Some system folders can only be read by an administrator. Click Run as administrator in the bottom-right to rescan with them included. Folders that couldn't be read are marked with ⚠.
- Size is the files' real size. Hover over a size to also see the estimated on disk size.
- OneDrive files that are only in the cloud count as 0 on disk.
- Junctions and symbolic links are shown but not followed, so nothing is counted twice through a link.
- Files with several hard links (common in
C:\Windows\WinSxSand some mod managers) are counted once per link. So a whole-drive total can come out a bit higher than the drive's used space. - Moving something to the Recycle Bin does not free space until you empty the bin.
$Recycle.Binshows up in the tree too, often as a big folder.
Needs Rust (stable).
cargo build --release
The exe is at target\release\foldersize.exe.
To build an exe for sharing, use powershell -File tools\build-release.ps1. It does the same build but removes your local folder paths (which include your Windows user name) from inside the exe.
MIT