SoftNexi

Windows · System & Disk Utilities

WizTree for Windows

Free disk-space analyzer that reads the NTFS Master File Table directly, scanning entire drives in seconds instead of minutes.

Updated August 9, 2026 · Reviewed by SoftNexi Editorial Team, Software research and documentation

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Overview

WizTree's defining feature is speed: instead of walking through a drive folder by folder like most disk analyzers, it reads the NTFS Master File Table (MFT) directly, which lets it inventory an entire drive's file structure in a fraction of the time a conventional scan takes. On large, file-heavy drives, this difference is dramatic.

The interface combines a treemap visualization with a sortable file/folder list, similar in spirit to WinDirStat and TreeSize but built around that fast-scan approach. It's a strong pick specifically when you're dealing with a nearly-full multi-terabyte drive and don't want to wait for a slow scan.

The MFT-reading trick only works on NTFS-formatted drives with administrator access; other file systems or restricted permissions fall back to a slower, conventional scan.

WizTree is free for personal use, with the developer offering a separate commercial license for business use — check the developer's site for current licensing terms.

Key features

  • Near-instant full-drive scans on NTFS via direct MFT reading
  • Combined treemap and sortable list view
  • File-extension breakdown by total size
  • Direct delete, move, or open-in-Explorer actions from results
  • Portable build available alongside the installer
  • Free for personal use

System requirements

Operating system
Windows 11 and Windows 10 (older Windows releases also supported)
File system
Fast MFT-based scanning requires NTFS; other file systems use a slower conventional scan
Permissions
Administrator rights required for the fast MFT scan method

How to install WizTree

  1. 1. Download from the developer

    Get the installer or portable build from wiztreefree.com.

  2. 2. Install or unpack

    Run the installer, or use the portable ZIP for a no-install option.

  3. 3. Run as administrator

    Launch WizTree elevated so it can use the fast MFT-based scan on NTFS drives.

How to use it

  1. 1. Scan a drive

    Select the target drive from the dropdown and click Scan; NTFS drives typically finish in seconds.

  2. 2. Explore the treemap

    Use the treemap to spot the largest files and folders visually, then click through to the file list for detail.

  3. 3. Sort the file-extension list

    Check the extension summary to see which file types are consuming the most space across the whole drive.

  4. 4. Clean up from results

    Right-click any file or folder in the results to delete or open it directly, without switching to Explorer.

Safety and privacy

  • Download only from wiztreefree.com, the developer's own site.
  • The fast scan method reads raw MFT data, which is why it requires administrator rights; it does not modify the drive.
Bundled software
The official installer does not bundle third-party offers.
Privacy
Runs entirely locally with no account requirement.

Known risks

  • Running with administrator rights is necessary for the fast scan, so only download from the official site to avoid a tampered installer gaining unnecessary elevated access.

What's new

  • Current release series

    Antibody Software updates WizTree periodically with performance and compatibility refinements. Check wiztreefree.com for the current version notes.

Pros and cons

Pros

  • Dramatically faster scans than conventional folder-walking tools
  • Free for personal use
  • Combined treemap and list view
  • Portable build available

Cons

  • Fast scanning only works on NTFS with administrator rights
  • Commercial use requires a separate paid license
  • Falls back to a slower scan on non-NTFS drives or without elevation

Verdict

If you regularly analyze large or nearly full NTFS drives, WizTree's scan speed alone justifies switching from a conventional analyzer. It's free for personal use and does the same core job as WinDirStat or TreeSize, just much faster.

Frequently asked questions

Why does WizTree need administrator rights?

Its fast-scan method reads the NTFS Master File Table directly, which requires elevated permissions. Without them, it falls back to a slower conventional scan.

Is WizTree free?

Yes, for personal use. Business use requires a separate commercial license — check the developer's site for current terms.

Does WizTree work on non-NTFS drives?

Yes, but without administrator MFT access it scans the conventional (slower) way, similar to other disk analyzers.