SpaceSniffer review
A free, portable Windows treemap analyzer for finding large files and folders.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
SpaceSniffer is a freeware disk-space analyzer for Windows that scans disks and displays folders and files in a treemap. It is suited to users who want a portable way to identify large items, inspect folder structure, and review disk usage without installing an application. The interface supports drill-down navigation and zooming, making it possible to move from a disk-level view into individual folders and files.
The published Freeware plan is free for personal and commercial use, and donations are accepted. Its analysis tools cover file-type filtering plus filters for file size and age, while file and folder tagging with color labels supports ongoing review. Alternate Data Streams scanning is also included. For users who prefer a visual overview, the treemap is the standout feature: space usage is represented through folders and files, helping large items stand out within the scanned scope.
SpaceSniffer also includes customizable textual report export, which gives users a way to preserve or share scan results outside the treemap view. Its portable operation is useful for Windows workflows where installation is undesirable, but availability is limited to Windows. The product stays focused on analyzing files and folders rather than broader storage management, so it fits users seeking visual disk-usage inspection and filtering. Users needing a different platform or a wider storage-management scope should choose an alternative designed for those needs.
SpaceSniffer pros and cons
- Where it wins
- Free for personal and commercial use
- Treemap views with drill-down navigation and zooming
- Filters, tagging, report export, and Alternate Data Streams scanning
- Where it doesn't
- Available only for Windows
- Reports are exported as customizable text
- Focused on disk-space analysis rather than broader storage management
SpaceSniffer fact sheet, pricing and score →
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