WizTree: when to install it, and when not to
Finding out where the disk space went in seconds, by reading the filesystem directly. It is a diagnosis, not a cleaner: it shows you the problem and…
The short version
WizTree: Reads the master file table directly and shows you what is eating your disk in seconds, not minutes, with a treemap view. The fastest way to find the 40 GB you did not know you had.
| Licence / price | Free for personal use |
|---|---|
| Platforms | Windows |
| Category | System & Hardware — 8 programs |
| Official download | https://diskanalyzer.com/ ↗ |
What it is for
Finding out where the disk space went in seconds, by reading the filesystem directly. It is a diagnosis, not a cleaner: it shows you the problem and leaves the decision to you.
When to pick something else
It is Windows-only, free for personal use, and it does not delete anything. If you expected a one-click fix, this is not that, and a one-click fix is not what an ageing machine usually needs.
How it compares in System & Hardware
These are the alternatives we would consider for the same job. The notes are the same ones used on the main list, so there is no separate ranking hiding on this page.
| Program | Licence / price | Platforms | Why it is on the list |
|---|---|---|---|
| CrystalDiskInfo Publisher's site ↗ | Free · Open source | Windows | Shows the SMART health of every drive in plain language, so you get a warning before a disk dies instead of after. Check any second-hand laptop with this before you hand over money. |
| CrystalDiskMark Publisher's site ↗ | Free · Open source | Windows, macOS | Measures real read and write speed on a drive so you can tell whether that new SSD is actually performing as advertised. Run it once after any upgrade, then forget about it. |
Practical notes
- Run it before deleting temp folders, so you are removing the large thing rather than guessing.
- Check drive health separately; a full disk and a failing disk are different problems.
Questions people ask
Is it a cleaner?
No. It reports; you decide. That separation is deliberate.
Where it appears in our guides
- Setting up a new Windows PC: the order that actually works
- Before and after a clean reinstall: the checklist
- How to spot a bundled installer before it is too late
- Getting a few more years out of an older PC
- Do you need a third-party antivirus on Windows 11?
See the full System & Hardware explainer for the other 7 programs in this category.
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