How to Free Up Disk Space on a Windows PC

01Quick answer

To free up disk space on Windows safely, use the tools in Settings: Storage Sense, which removes temporary files automatically, and the cleanup recommendations, which list large files, unused apps and old downloads for you to review. Then uninstall apps you no longer use and move large personal files such as videos to an external drive or cloud storage. This guide is for Windows 10 and 11 users who see a low disk space warning, can’t install updates or whose drive bar has turned red.

02Before you start

• Back up first. If you plan to delete personal files, make sure there’s a copy elsewhere. Our backup guide explains how.
• Know where space goes. Open Settings, System, Storage to see a breakdown by category, such as apps, temporary files and documents.
• Don’t delete system folders by hand and don’t use registry cleaners or “disk optimiser” apps. Windows includes safe tools.
• Empty means gone. Files removed from the Recycle Bin can’t easily be recovered.

03Why this happens

Usually simple to fix:

• Temporary files and old update files have built up.
• The Downloads folder holds old installers and duplicates.
• The Recycle Bin hasn’t been emptied.
• Large videos, photos or games are stored on the main drive.
• Apps you no longer use are still installed.
• Files synced from cloud storage are kept fully downloaded on the PC.

Needs the manufacturer or a repair service:

• The drive is simply too small for how you use the computer. A repair service can advise on adding storage where the computer allows it.
• Space disappears quickly for no visible reason, or disk errors appear, which can point to a deeper problem.

04Use Windows’ built-in cleanup

1. Open Storage settings. Go to Settings, then System, then Storage.
2. Turn on Storage Sense. It automatically clears temporary files and, if you choose, empties the Recycle Bin and old downloads on a schedule. Open its settings to choose what it cleans and how often.
3. Review cleanup recommendations (Windows 11) or Temporary files (Windows 10). Windows lists items such as temporary files, large or unused files, files synced to the cloud and unused apps.

   What you should see: each category shows how much space it uses. Tick only the items you’re sure you don’t need, then select the clean-up button.

4. Check the Downloads option carefully. It deletes everything in your Downloads folder. Move anything you want to keep first.
5. Empty the Recycle Bin once you’re sure it holds nothing you need.

05Remove and move what you don’t need

1. Uninstall unused apps. Open Settings, then Apps, then Installed apps (Windows 11) or Apps & features (Windows 10). Sort by size, and uninstall apps you no longer use. Leave anything from your computer maker or Microsoft that you don’t recognise, rather than guessing.
2. Move large personal files. Copy big folders of videos or photos to an external drive, check they open there, then delete them from the PC.
3. Use cloud files on demand. If you use OneDrive or another cloud service, its settings may let you keep files online only until you open them. This frees space while keeping the files available.
4. Restart and check Storage again.

   Is there enough space now? A drive with a healthy amount of free space runs updates and apps more smoothly. If it’s still nearly full, repeat the review of large files.

06Keep space free over time

Clearing space once helps, but a few habits stop the drive filling up again.

• Leave Storage Sense switched on so temporary files are cleared automatically.
• Tidy Downloads monthly. Installers and email attachments pile up quickly. Move what you need into Documents or Pictures and delete the rest.
• Watch for duplicates. Photos imported from a phone more than once, and copies of the same video, take a lot of room.
• Review apps and games now and then. Large games are often the biggest single users of space and can be reinstalled later from the store you bought them from.

07Common mistakes to avoid

• Deleting files from the Windows or Program Files folders, or files you don’t recognise.
• Emptying Downloads without checking for documents you meant to keep.
• Moving files to an external drive and deleting the originals before checking the copies open.
• Installing “cleaner” apps that promise to free space or speed up your PC.
• Turning off features like System Protection to gain space without understanding what they do.

08If it still doesn’t work

If the drive is still full after cleanup, it may be too small for your files and apps. Keep more files on an external drive or in cloud storage, or ask a qualified repair service or your computer’s manufacturer whether the storage can be upgraded. If space vanishes quickly or you see disk errors, get the drive checked. Low space can also slow the whole computer; see our slow computer guide, and if updates failed because of space, retry them using our Windows Update guide.

09The short version

Turn on Storage Sense, review the cleanup recommendations, uninstall apps you don’t use and move large personal files elsewhere. Back up before deleting, and never delete system files by hand.

10FAQ

Is it safe to delete temporary files?

Yes, when you use Windows’ own tools such as Storage Sense or the temporary files list in Settings. They only remove files Windows marks as safe to delete. Don’t delete files from system folders by hand.

What is taking up so much space on my C drive?

Open Settings, System, Storage to see a breakdown. Common culprits are apps and games, videos and photos, the Downloads folder and temporary files.

Will freeing up space make my computer faster?

It can help if the drive was almost full, because Windows needs room for updates and temporary work. It won’t fix every slowdown; startup apps and heat matter too.

Should I compress my drive to save space?

Usually not. Compression can slow down access to files. Moving large files to external or cloud storage is a simpler and safer way to gain space.