SpaceSniffer has always been free, there's no paid version, license key, or trial countdown to worry about, which is worth confirming since many disk-analysis tools have shifted to subscriptions. It also ships as a single portable .exe with no installer, so 'free download' here really means a small file you can run straight from a USB stick or a folder without admin rights.
Why It's a Treemap, Not a Folder Tree
Unlike Windows Explorer's folder-and-subfolder list, SpaceSniffer renders your drive as a treemap: every file and folder becomes a rectangle sized proportionally to how much space it uses, nested inside its parent folder. A single glance shows you the one enormous video file or forgotten node_modules folder hiding three levels deep, instead of clicking through directories one at a time.
You can zoom into any block, filter by file type or date, and exclude folders from the scan, and the view updates live as you delete files, so you can watch the freed space shrink the block in real time.
Who ends up using SpaceSniffer
SpaceSniffer is favored by users who need to quickly find what's eating disk space without installing anything.
- IT technicians triaging a nearly-full drive on someone else's PC via USB
- Developers hunting down forgotten build-cache or dependency folders
- Home users clearing space before a Windows update fails from low storage
Before you install
A couple of things worth knowing about SpaceSniffer before you request the link: it only ships for Windows, so double-check that's the machine you're installing it on before you request the link. And on pricing, SpaceSniffer is free to use outright — there's no paid tier hiding behind it, so what you install is the whole app. It's developed and maintained by Uderzo.
System requirements
- WindowsWindows 10 or 11 (64-bit); older 7/8.1 builds usually still run but no longer get official support
It's a lightweight tool, so there's no serious CPU/RAM/storage requirement beyond what its OS already needs to run comfortably.
Quick steps
- Download SpaceSniffer.exe (no installer needed)
- Run it and select the drive or folder to scan
- Click into the largest colored blocks to find space hogs
SpaceSniffer: the honest trade-offs
- Treemap view spots huge files instantly instead of clicking through folders
- Fully portable, runs from a USB stick with no install or admin rights
- Live view updates as you delete files, showing freed space in real time
- Interface looks dated and lacks the polish of newer disk analyzers
- No built-in duplicate-file detection, only size-based visualization
The download links to the official build hosted by its developer, Uderzo, unchanged from the version distributed at spacesniffer.exe, no bundled toolbars or installer wrappers.
Other System Utilities downloads people search for
Browse the full System Utilities category →
Keeping SpaceSniffer up to date
SpaceSniffer typically checks for updates from inside the app, or you can just re-download the current installer from the official source periodically — reinstalling over the top keeps your settings. Sticking to the developer's own distribution channel — which is what this page links to — means you're never stuck on an old build with unpatched bugs just because a mirror site stopped updating its copy.
Features, install steps, alternatives and more detail live on the main SpaceSniffer page.
Frequently asked questions
Does SpaceSniffer need to be installed, or does it just run?
It's fully portable, a single .exe you can double-click and run immediately, including from a USB drive, with no installation or admin rights required.
Will SpaceSniffer delete files for me?
You can delete files directly from within SpaceSniffer's view, but it won't do anything automatically, it's a visualization tool first, so you decide what to remove after seeing what's taking up space.
