Deleting dozens of small documents may achieve less than finding one forgotten video export. When storage runs low, the first job is locating the files that actually occupy your drive. WizTree turns that search into a visual inspection.
This tutorial walks through a Windows scan, explains the results and helps you choose what to remove. You will also learn why an apparently large file may offer little recoverable space and how to protect backups and cloud files.
Step 1: Download WizTree and Set a Baseline
WizTree is a disk space analyzer developed by Antibody Software. It displays storage consumption through folder listings, individual file results and a visual treemap.
Download the installer or portable package from the official download page. The portable option runs from an extracted folder. Personal use is free; commercial use requires an appropriate paid license.
Before starting WizTree, open File Explorer, select This PC and note the affected drive’s available space. Save any active work so you can review files without interrupting an unfinished task.
Step 2: Scan the Drive That Needs Space
Open WizTree and follow this sequence:
- Select the correct drive. Choose C: when the Windows system drive is full.
- Check permissions. Administrator access enables high-speed NTFS scanning; follow workplace permissions when applicable.
- Click Scan. Wait for the results to finish loading.
- Begin with the largest folders. Expand their branches to identify the contents.
On NTFS drives, WizTree can read the Master File Table directly. Network drives and other file systems use different scanning methods, so scanning times vary.
If Windows cannot see an external drive, resolve that connection problem before expecting useful scan results. If the missing drive is an SSD, our SSD not showing up in Windows troubleshooting guide explains how to investigate detection and connection issues before scanning again.
Step 3: Read the Results Before Selecting Files
The WizTree directory tree helps explain where storage accumulates. Expand a large folder until you recognise its purpose. A project directory containing hundreds of modest files can matter just as much as one huge recording.
Compare Size with Allocated
| Column | What it measures |
|---|---|
| Size | The file’s logical length |
| Allocated | Disk space allocated to the file |
Sort Allocated from largest to smallest when investigating local storage. Compression can reduce a file’s disk footprint relative to its logical size.
A cloud placeholder can represent a large online file while occupying very little local space. Inspect its allocated value before expecting a meaningful saving. Likewise, a large file may belong to an application you still use, so trace its path before choosing a cleanup method.
Next, open File View in WizTree to inspect individual entries. The treemap provides a visual shortcut: larger rectangles highlight larger files. Always check the selected name and location.
Suppose a large folder holds finished video exports. Confirm whether the source project and a usable backup remain available before treating those exports as replaceable.
Step 4: Filter Large Files and Verify Duplicates
Use the WizTree File View search filter to narrow the results:
| Filter | What it finds |
|---|---|
=file a>=1gb | Files with at least 1 GB allocated |
*.mp4 a>=1gb | MP4 videos with at least 1 GB allocated |
*.zip | ZIP archives |
Keep operators attached to their values. Spaces between separate conditions combine them, helping you search for a particular file type and storage footprint together.
If WizTree searches seem incomplete, inspect Max files to display. The default search display is limited to 1,000 matching results. Showing every match may take longer.
Treat duplicate results as candidates
WizTree matches possible duplicates by name, size and optionally modification date. It does not compare file contents. Verify matches independently before removing copies, especially inside application folders where identical files may serve separate programs.
Step 5: Remove or Relocate Files Safely
Use WizTree findings to choose an appropriate cleanup action:
- Personal downloads: Review old installers, archives and recordings individually.
- Wanted files: Copy them to another drive, verify the copies open, then decide whether to remove the originals.
- Unused software: Use the application’s uninstall controls.
- Games: Remove or relocate installations through the launcher.
- System files: Use Windows cleanup tools rather than deleting unfamiliar directories.
In Windows 11, open Settings > System > Storage > Cleanup recommendations. Review each category and its selected items before proceeding.
Handle OneDrive files differently
For OneDrive files you want to retain online, right-click in File Explorer and choose Free up space. This releases local storage while preserving the cloud copy. Deleting a synced file can also delete it online.
Keep unfamiliar AppData folders and working backups until you understand their purpose.
For shared work computers, confirm ownership before removing another person’s project files or download archives.
Step 6: Rescan and Check the Difference
Review the Recycle Bin before emptying it. Files remaining there can still occupy storage. Run WizTree again, then compare the drive’s available space against your starting figure.
If space quickly disappears again, investigate the growing folder and the application writing to it. Fixing that behaviour provides a more lasting result than repeatedly deleting its output.
Make a short note of the folders responsible for most of the recovered space. If old exports keep returning, change the application’s output location or retention settings where appropriate.
Conclusion
WizTree helps you locate storage worth investigating, but the best cleanup decisions depend on understanding each file. Scan one drive, review allocated space, verify important copies and use suitable removal controls. Finish by rescanning so you can confirm what changed.
Frequently Asked Questions
Is WizTree free for home use?
Yes. Personal use is free. Check the developer’s licensing requirements before using the software commercially.
Can I scan an external drive?
Yes. WizTree supports USB drives and multiple Windows-supported file systems. The scanning method depends on the drive format and permissions.
Why do storage totals differ from Windows?
Some NTFS metadata, including directory indexes and security information, occupies space outside the files listed. This can explain a small difference.
Will freeing space fix all performance problems?
No. Storage cleanup addresses insufficient capacity. Persistent slowness can require separate checks for memory pressure, processor activity or application problems.
