What disk space analyzer do you use on Windows?

[CfFan]

I’m looking for a straightforward Windows app to show what’s taking up space on a drive, ideally with a folder treemap or similar visual view. I don’t need it to delete anything automatically, just help me find large folders and files before I decide what to clean up. Any reliable free options, especially ones that can run without installation?

 

[Jorn Keis]

WizTree has a portable version and is free for personal use. It gives you both a folder tree and a visual treemap, so it should cover what you’re looking for.

It’s particularly fast on NTFS drives because it reads the Master File Table directly. Scanning doesn’t automatically delete anything.

I’d use it to identify the large folders, then check what they contain before removing anything. A large folder isn’t necessarily disposable, especially under Windows or AppData.

 

[LuckyHedgehog]

Are you mainly checking an internal NTFS drive, or do you also want to scan external or network drives? That might affect which tool is the best fit, since WizTree’s speed advantage is strongest on NTFS.