What is taking up space on my PC?

When your Windows 10 or 11 PC suddenly runs out of storage, you need to know which folder is actually hoarding gigabytes. DiskLens scans your drive, adds up every byte in each folder, and shows you the space hogs at the top.

Why built-in Windows storage views don't answer this

Windows itself shows you top-level categories — Documents, Downloads, Program Files — but not which subfolder inside Program Files is actually 80 GB. You open File Explorer, look at properties, and get no clear answer. DiskLens does something different: it walks your entire folder tree, sums everything nested inside each one, and ranks them by size. The biggest folder appears at the top. No guessing.

The tool stays read-only the whole time. It tells you what's taking space; you decide what to clean up afterwards in File Explorer. Nothing gets deleted or moved without your hand on the mouse.

How to find what's eating your storage

Download and install. Download the zip from diskspaceanalyzerpc.com, run the standard Windows installer, and launch DiskLens. Installs in about a minute for Windows 10/11.
Point it at your drive or a folder. Press Browse and select your C: drive, or drill into C:\Users\YourName or C:\Program Files if you suspect a specific spot.
Run the scan. Press Scan. It takes a few seconds for a full drive; it walks every subfolder and hidden file and totals everything up.
Look at the top of the list. The biggest folder is right there. If it's a parent folder like Users or Program Files, select it and scan again to see what's nested inside.

Real scenarios where this solves the problem

**Your Downloads folder is a mess.** You download a lot of installers, videos, old project files. DiskLens shows you exactly which files or subfolders are consuming the most space, so you can archive the old stuff and delete what you don't need.

**Program Files grew way too big.** You installed three game versions or old SDKs. Scan Program Files, see the culprit folder, then uninstall it cleanly or move it elsewhere.

**Your user profile folder is bloated.** AppData, Temp folders, cache from browsers and tools can hide gigabytes. DiskLens shows you the real totals for each, so you know where the waste lives before you start deleting.

**You're running low on a secondary drive.** External drive, second partition, USB stick — point DiskLens at any folder or drive, and it works the same way.

Why this approach is different

Most tools force you to sign up, show ads, or upload file lists somewhere. DiskLens is free, installs in about a minute, and requires no account to create.

It's also honest about what it does. It scans and reports. You open File Explorer afterwards and decide what to keep, archive, or remove. The tool never touches your files on its own. You stay in control.

Common questions

Will it slow down my PC?

No. It runs light and doesn't require much. Older laptops and budget PCs handle it fine.

Does it need the internet?

No. Everything happens on your machine. No uploads, no telemetry, no calls home.

How do I install it?

Not for most folders. Your Downloads, Documents, and user profile scan as a standard user. Some protected system paths need elevation, but you'll only hit that if you dig into Windows system folders.

Is it really free?

Yes. Free to download, free to use, source is open under MIT. No trial window, no paid tier hiding behind a paywall.