Start with the biggest space-wasters first

Your PC runs slower and programs crash more often when the hard drive is nearly full. The fastest way to free up space is to find and remove the files taking up the most room — usually old video files, installer packages, or duplicate photos. Windows has a built-in tool called Storage Sense that shows you exactly what is consuming space and lets you delete it in a few clicks.

Open Settings, go to System, then Storage. You will see a breakdown by file type: apps, photos, videos, documents, and other. Click on any category to see individual files sorted by size. Start with videos and downloads — these are almost always the culprits. A single video file can be 1 to 4 gigabytes; a folder of old installers can be 10 gigabytes or more.

Key Takeaways

  • Storage Sense in Windows Settings shows you which file types are using the most space, and you can delete them directly from that view.
  • Installer files (.exe and .msi files) and old Windows updates take up gigabytes and can be safely removed once the program is installed.
  • The Recycle Bin holds deleted files until you empty it, so clearing it can when ready recover several gigabytes without losing anything you want to keep.
  • Temporary files and cache folders accumulate over months and often contain nothing you need; Disk Cleanup removes them safely.
  • Moving photos, videos, or documents to an external drive or cloud storage frees up space without deleting anything.

Remove installer files and old Windows updates

Once you install a program, the installer file (.exe or .msi) is no longer needed. These files often sit in your Downloads folder or in Program Files and waste 100 megabytes to several gigabytes per program. Open File Explorer, navigate to your Downloads folder, and delete any .exe or .msi files you recognize. If you are unsure whether you still need a program, search for it in Settings under Apps to see if it is installed; if it is, the installer can go.

Windows also keeps old update files in a folder called WinSxS and in the Windows.old folder after major updates. These can consume 5 to 20 gigabytes. Use Disk Cleanup to remove them safely. Press Windows key + R, type cleanmgr, and press Enter. Check the boxes for "Temporary files", "Recycle Bin", "Temporary internet files", and "Previous Windows installation(s)". Click OK and let it run — this usually frees up 5 to 15 gigabytes with no risk to your system.

Empty the Recycle Bin and clear temporary files

When you delete a file, it goes to the Recycle Bin instead of disappearing. The Bin can hold several gigabytes of deleted files until you empty it. Right-click the Recycle Bin icon on your desktop and select "Empty Recycle Bin". If you do not see the icon, open File Explorer, click "View" at the top, then check "Show hidden items" — the Recycle Bin will appear.

Temporary files accumulate in hidden folders as you use your PC. Windows stores these in C:\Users\[Your Username]\AppData\Local\Temp. You can delete everything in this folder safely — Windows will recreate what it needs. Open File Explorer, paste this path into the address bar at the top, and delete all files inside. Some files may be locked by running programs; skip those and delete the rest.

Uninstall programs you no longer use

Programs you no longer use take up space and slow down your PC by running background processes. Open Settings, go to Apps, then Apps & Features. Scroll through the list and look for programs you recognize but do not use. Click on each one and select "Uninstall". This removes the program files and often frees up 500 megabytes to several gigabytes per program.

Be cautious with programs you do not recognize — these may be system tools or drivers your PC needs. If you are unsure, search the program name online before uninstalling. Programs with names like "Intel Management Engine" or "Realtek Audio" are usually necessary. Programs like old games, trial software, or duplicate browsers are safe to remove.

Move files to external storage or cloud backup

If you have photos, videos, or documents you want to keep but do not use often, moving them to an external drive or cloud storage frees up space without deleting anything. Plug in an external hard drive or USB stick, then drag your files into it. A 1-terabyte external drive costs $40 to $80 and holds thousands of photos and videos.

Cloud storage like OneDrive (included free with Windows), Google Drive, or Dropbox also works. Upload your files to the cloud, then delete the local copies from your PC. You can still view and read them anytime you need them. This is safer than an external drive because your files are backed up on a company's servers, not sitting in a drawer where they could be lost or damaged.

Check for duplicate files and old backups

Over time, you may accumulate duplicate copies of photos, documents, or videos without realizing it. Search your PC for files you know you have multiple copies of — for example, search for a photo by name and see how many versions exist. Delete the duplicates you do not need. A folder of old project files or backup copies can easily be 5 to 10 gigabytes.

Windows also creates system restore points and backup files that can grow very large. Open Settings, go to System, then Storage, and click "Temporary files". Look for "System restore points" and "Previous versions of files" — these are safe to delete if you do not use them. You can also disable automatic backups if you use cloud storage instead. Go to Settings, System, About, then "Advanced system settings", and click "Configure" under System Protection to turn it off.

Disable or move large cache folders

Web browsers, games, and media players store cache files — temporary copies of images, videos, and web pages — to load faster next time. These folders can grow to 5 gigabytes or more. Clear your browser cache by opening your browser settings, finding Privacy or Clear Browsing Data, and selecting "Cached images and files". Set it to clear on exit so it does not accumulate again.

Games and programs like Steam, Epic Games, or Adobe Creative Suite also maintain large cache folders. Open each program's settings and look for a Cache or Temporary Files option. Most let you clear the cache or move it to an external drive. Clearing cache is safe — the program will rebuild it as needed, and you may notice a slight delay the first time you use the program after clearing.

Frequently Asked Questions

How much free space should I keep on my PC?

Windows needs at least 10 to 15 percent of your total drive space free to run smoothly. If your drive is 500 gigabytes, keep at least 50 to 75 gigabytes free. If you are below 10 percent, your PC will slow down noticeably and programs may crash. Check your free space in Settings under System, Storage — it shows at the top of the page.

Is it safe to delete files from AppData or Temp folders?

Yes, the Temp and AppData\Local\Temp folders are designed to hold temporary files that can be deleted. Some files may be locked if a program is using them, but you can skip those. Windows will recreate any temporary files it needs. Do not delete files from AppData\Roaming — that folder holds program settings and data you may need.

What if I delete something important by mistake?

If you deleted a file within the last few weeks, it is still in the Recycle Bin. Right-click the Recycle Bin, select "Open", find the file, right-click it, and choose "Restore". If the Recycle Bin is already empty, you can recover deleted files using free recovery software like Recuva, but recovery becomes harder the longer you wait and the more you use your PC after deletion.

Should I use a disk cleanup tool from a third party?

Windows Disk Cleanup and Storage Sense are built in and safe. Third-party tools like CCleaner can work, but they are not necessary and sometimes remove files you want to keep. Stick with the tools Windows provides — they are reliable and do not require installing extra software.

Can I move my entire Documents or Pictures folder to an external drive?

Yes. Right-click the folder in File Explorer, select Properties, go to the Location tab, and click Move. Choose your external drive. Windows will move all files there and update the shortcuts so programs still find them. This is a safe way to free up space while keeping your files organized and accessible.