We all know that extremely annoying Windows notification that keeps on saying you’re running out of storage. Whenever we see the notification, the first thing we do is open File Explorer, check our C: drive, and wonder where all that space suddenly went. Not being able to figure it out takes a toll, and that’s exactly the problem TreeSize solves.
Instead of opening folders one by one and checking their Properties, TreeSize scans your drive and shows you exactly which folders and files take up the most space. You can then find the files that aren’t that important and delete them to free up space.
I find this tool much more useful than randomly deleting things. In this guide, I will walk you through how TreeSize can be an excellent disk-usage analyzer and how it helps you find large files.
Key Takeaways
- Don’t start deleting random files before you know what’s taking up space. TreeSize helps because it shows you that information first.
- The biggest folder isn’t the one you are supposed to clean. A huge Windows or Program Files folder may be completely normal.
- Run TreeSize as administrator when checking the whole C: drive. Otherwise, some protected locations may not be fully visible.
- Look for files you recognize. Old downloads, forgotten installers, game files, and giant logs are much easier to identify than random Windows files.
What Is TreeSize?
TreeSize is a disk-space analyzer made by JAM Software for Windows.
Think of File Explorer, but with folder sizes; that’s probably the easiest way to understand TreeSize.
Normally, to see how much space a folder uses, you have to right-click it and open Properties. Then you repeat the same thing for another folder. And another. The process is tedious, and TreeSize does this heavy lifting for you.
But TreeSize scans a drive and builds a folder-by-folder view showing how much storage each location uses. You can then sort the results by size, open a folder, see what’s inside it, and keep going until you reach the files responsible for the storage usage. Once you have this information, you know the next step- deleting the less important files that are eating up your space.
TreeSize currently supports Windows 10 and Windows 11.
If you want to install TreeSize for personal, non-commercial use, well, it’s free. The paid editions offer more features and are ideal for people who need advanced storage management.
Why Use TreeSize Instead of File Explorer?
File Explorer is a great tool, no wonder. It’s perfectly fine for opening files, moving folders, and doing everyday work.
But it doesn’t really answer your one question: “What is filling up my drive?”
That’s where TreeSize wins the spotlight. Below is a simple comparison between what TreeSize and File Explorer can do for you.
| What you want to do | File Explorer | TreeSize Free |
| Check a folder’s size | Yes | Yes |
| See folder sizes across a drive | Not conveniently | Yes |
| Sort folders by size | Limited | Yes |
| Drill into large folders | Yes | Yes |
| See which files are consuming space | Manually | Yes |
| Scan a complete drive | Possible, but challenging | Yes |
| Visualize storage usage | Limited | Yes |
TreeSize can also show file count, occupied space, and other file details. Its visual views are like a blessing for users like me. I can now easily spot unusually large sections of my storage.
How to Use TreeSize?
The basic process is pretty simple. Follow these simple steps, and you will be good to go:
1. Download TreeSize
Get it from the official JAM Software website, not any random download site.
2. Run TreeSize as Administrator
Right-click TreeSize Free and select Run as administrator.
Windows generally protects several folders from normal access. Running TreeSize with permissions gives it access to locations it might otherwise miss during a scan. JAM Software also recommends administrator rights when you need to scan files that aren’t accessible otherwise.
3. Select the Drive You Want to Check
If your computer is running low on storage, start with your C: drive. Depending on your setup, you can also scan another internal drive, an external drive, or a USB device. TreeSize can scan local drives and support external storage, so you aren’t limited to the Windows drive.
4. Let the Scan Finish
TreeSize will now work through the folders on your drive and provide you with a directory view.
How long this takes depends on the amount of data and the drive itself. TreeSize uses the NTFS Master File Table for local NTFS drives, which helps it scan. You don’t need to sit there watching every folder appear. Let it finish, then you can start with the largest numbers.
5. Sort by Size
This is where the tool becomes really useful. Find the Size column and sort it from largest to smallest. Now you can immediately see where all your storage is going.
For example, you might see something like:
- Users: 180 GB
- Windows: 35 GB
- Program Files: 28 GB
- Program Files (x86): 12 GB
- Other folders: 5 GB
Remember that this is definitely not a deletion checklist. It’s rather a map. Your next job is to open the biggest folder and see what’s inside it.
How to Find the Files Taking up the Most Space?
TreeSize comes in handy for this. Let’s say your Users folder is taking up 180 GB. You’ll have to expand it.
You’ll then find that your own account is using 165 GB. Open that, and perhaps Downloads is responsible for 70 GB.
Open Downloads again and suddenly you might come across:
- Old Windows installers
- ZIP files you downloaded months ago
- Duplicate videos
- Forgotten software installers
- Huge project folders
- Files you downloaded once and never touched again
That’s much easier to deal with than blankly staring at a drive saying “50 GB free.” You’ll have to keep drilling down until you reach something you recognize. Then you can decide accordingly.
What Files Can You Safely Delete?
- Downloads
This is probably the first folder I’d inspect.
Old installers, PDFs, ZIP archives, and random files from six months ago tend to stay there forever.
- Temporary files
Temporary data often accumulates over time. Check what you’re removing rather than deleting unfamiliar system files.
- Browser caches
Cache files can take up space and are generally safe to clear, although your browser might rebuild them later.
- Old installers
If you’ve already installed an application and still have its setup file sitting in Downloads, you will not need it anymore. Those are safe to delete.
- Old game installations
If you’re into games, you know that games can easily take tens or even hundreds of GBs. If you haven’t played one in months, check whether you still need it and delete the ones you are not willing to play anymore.
Also read: How to Manage App Overload: Tips, Tricks, and a Step-by-Step Guide to Declutter Your Device.
What Files Should You Leave Alone?
If TreeSize shows that C:\Windows is huge, it’s better not to start deleting files from it manually.
The same goes for folders such as:
- C:\Windows\System32
- C:\Windows\WinSxS
- C:\Program Files
- C:\ProgramData
Some of these folders can legitimately be very large. If you don’t recognize a file or don’t know which application needs it, leave it alone and investigate first.
Also Read: How to Recover Deleted Files: A Step-by-Step Guide
AppData: What Should You Check Here?
If you’ve gone through Downloads and your usual files but still can’t figure out the missing storage, you can look at:
C:\Users\YourName\AppData
AppData contains information created by applications you are currently using. That can include caches, settings, temporary data, and logs. For example, Outlook often stores local data inside the AppData folder.
You may find something completely ordinary taking up an unreasonable amount of space. That’s why I would suggest you check this section, especially when your storage numbers don’t seem to add up.
However, you shouldn’t delete random folders inside AppData either. First, find out which application owns the data, then start removing files accordingly.
Is TreeSize Safe?
Yes, TreeSize is safe, but the bigger safety issue isn’t really TreeSize itself. It’s what you choose to delete with it.
The software can show you files that Windows normally keeps out of your sight. That doesn’t mean those files are disposable and eligible for deletion. So before deleting something, ask yourself one simple question:
“Do I know what this file belongs to?” If the answer is no, just leave it alone.
Final Thoughts
If your Windows PC is running out of storage, don’t start deleting random folders.
First, find out what’s taking up space; use TreeSize to do it. It gives you a simple view of your drive, lets you sort the biggest folders to the top, and helps you get to the bottom where huge, unnecessary files take up all the space.
Sometimes the culprit is something ridiculous: an old game, a forgotten download folder, a pile of installers, or an application log that somehow grew to several gigabytes. Once you know what’s eating your storage, cleaning it up becomes an easy decision.
For more information on AI, tech, Science, Futurism, and more, check Yaabot.
FAQs
Yes. TreeSize Free is free for private, non-commercial use on Windows desktop systems. JAM Software also sells Personal and Professional editions with additional features.
Yes, especially when you’re scanning your entire C: drive. Administrator access lets TreeSize read locations that may otherwise be inaccessible, giving you a more complete view of your storage.
Yes. TreeSize includes file deletion options, and you can configure deletion to send items to the Recycle Bin instead of immediately removing them.
Yes. TreeSize can scan connected storage devices, including external drives and supported USB storage. Select the drive you want to check and start the scan.
