Download SpaceSniffer

SpaceSniffer is a free disk space visualization tool for Windows that uses an innovative treemap layout to show how files and folders are distributed across your hard drive. Each rectangle on the map represents a file or folder, with its size proportional to the space it occupies — making it instantly obvious where your disk space is being consumed.

Unlike traditional list-based disk analyzers, SpaceSniffer’s visual treemap lets you spot large files and bloated folders at a glance. You can zoom into any area, filter by file type or date, and navigate the entire drive hierarchy without leaving the visual interface. Clicking any rectangle drills down into that folder for a more detailed view.

Portable and requiring no installation, SpaceSniffer is the fastest and most intuitive way to understand your disk space usage and identify files that can be safely deleted to free up space.

Key Features

• Visual treemap layout shows disk space usage at a glance
• Zoom into folders and files for detailed space analysis
• Filter by file extension, size, or age to find specific file types
• Real-time scanning updates the map as you navigate
• Color-coded display differentiates files, folders, and free space
• Works on local drives, USB drives, and network shares
• Portable — no installation required, runs from a single executable

How to Install

1. Click the download button above to get the SpaceSniffer archive.
2. Extract the ZIP file to any folder or USB drive.
3. Run SpaceSniffer.exe directly — no installation needed.
4. Select a drive from the dropdown and click “Start” to begin scanning.
5. Hover over any block to see its name and size, or click to drill deeper.