Start with the biggest space-eaters: Windows and your user folder

Your hard drive fills fastest with two things: the Windows operating system itself, and the files you store in your user folder (Documents, Downloads, Desktop, Pictures). Before you delete anything, you need to see what is actually taking up space. The built-in Storage settings in Windows 10 and 11 shows you exactly which folders are largest.

Open Settings, go to System, then Storage. Windows will scan your drive and show you a breakdown by category—apps, system files, temporary files, and your personal folders. Click on any category to drill down further. Your Downloads folder is often the culprit; it collects installers, old documents, and files you forgot about. Your Documents and Pictures folders come next. Delete what you no longer need, then empty the Recycle Bin to actually free up the space.

If Windows itself is taking up 20 GB or more, you likely have old system backups or previous Windows installations sitting around. In Storage settings, look for "Temporary files" and "Previous versions of Windows"—both are safe to delete. Windows will warn you before removing anything critical.

Key Takeaways

  • Open Windows Storage settings to see which folders and file types are using the most space before you start deleting.
  • Your Downloads, Documents, and Pictures folders usually hold the most deletable files—old installers, duplicates, and files you no longer use.
  • Temporary files, cache, and previous Windows installations are safe to delete and often free up several gigabytes at once.
  • Uninstall programs you no longer use through Settings > Apps, which removes both the program and its associated files.
  • Move large files like videos and photos to an external drive or cloud storage to free up internal drive space without losing them.

Clear out temporary files and cache

Windows stores temporary files in a folder called Temp, and most programs also keep cache files—copies of things they have downloaded to load faster next time. These files add up quickly and are safe to delete because the programs will recreate them if needed.

The easiest way is through Storage settings again. Under "Temporary files," you will see options to delete temporary files, recycle bin contents, and downloads. Check all three boxes and click Delete. This usually frees up 1 to 5 GB depending on how long it has been since you last cleaned up.

If you want more control, you can manually delete the Temp folder. Press Windows key + R, type %temp%, and press Enter. A folder will open showing temporary files. Select all (Ctrl + A), delete them, and empty the Recycle Bin. Some files may be locked by running programs—Windows will skip those, which is fine. Do the same for the Prefetch folder by typing %systemroot%\Prefetch in the Run dialog.

Uninstall programs you no longer use

Every program installed on your PC takes up space, and many also run background processes that slow your computer down. Go to Settings > Apps > Installed apps, and scroll through the list. Look for programs you have not used in months—games, trial software, old versions of things you have replaced.

Click on a program and select Uninstall. Windows will remove the program and most of its files. Some programs leave behind configuration files or data folders, but the bulk of the space is freed when ready. If you are unsure whether you need something, search for it online first—you can always reinstall it later if you change your mind.

Pay special attention to programs that came pre-installed on your PC (sometimes called bloatware). Many of these can be safely removed. Windows itself will not let you uninstall critical system programs, so you cannot break anything by trying.

Move files to external storage or cloud backup

If you have large files you want to keep but do not need on your PC every day—old projects, video files, photo archives—moving them to an external drive or cloud storage frees up internal space without losing them. An external hard drive is the cheapest option for large amounts of data. A 2 TB external drive costs $50 to $100 and holds as much as many laptops.

Plug in an external drive, open File Explorer, and drag your large folders (Pictures, Videos, old Documents) to the external drive. Once the transfer is complete, you can delete the originals from your PC. Keep the external drive in a safe place and plug it in occasionally to make sure it still works.

Cloud storage like OneDrive (built into Windows), Google Drive, or Dropbox works differently—your files stay in the cloud and sync to your PC only when you open them. This saves local space but requires an internet connection to access files. Many cloud services offer 5 to 15 GB free; larger amounts require a paid subscription.

Check for duplicate and old files

Over time, you accumulate duplicate files—multiple copies of the same photo, document, or installer. Windows does not have a built-in duplicate finder, but you can spot them manually by sorting your Downloads and Documents folders by date and looking for files with similar names.

Another common space-waster is old backups. If you have ever used Windows Backup or File History, check your backup location (usually a folder called WindowsImageBackup on an external drive or network location). Old backups can be several gigabytes each. Keep your most recent backup and delete older ones.

For a more thorough search, third-party tools like CCleaner (free version) or TreeSize Free can scan your entire drive and show you the largest files and folders. These tools are safe to use and give you a clear picture of where your space is going. However, they are optional—the built-in Storage settings will handle most cleanup jobs.

Compress files and folders

Windows can compress files and folders to save space, though the savings are usually modest (10 to 30 percent depending on file type). Compression works best on documents, spreadsheets, and text files; it does almost nothing for photos, videos, or music because those are already compressed.

Right-click a folder, select Properties, click Advanced, and check "Compress contents to save disk space." Windows will compress the folder and everything in it. You can still open and use the files normally—Windows decompresses them automatically when you need them. The trade-off is that accessing compressed files is slightly slower.

For one-time backups or files you rarely access, you can also create a ZIP file. Right-click a file or folder, select Send to, then Compressed (zipped) folder. This creates a single ZIP file that takes up less space. To use the files again, you unzip the folder.

Turn off or reduce system restore and hibernation

Windows keeps system restore points—snapshots of your system that let you roll back if something goes wrong. These restore points can use 5 to 10 GB or more. If your drive is very full, you can reduce how much space restore points use, though this means fewer restore points to fall back on.

Go to Settings > System > Storage > Advanced storage options > Storage Sense. Turn on Storage Sense and set it to delete temporary files automatically. You can also go to System Properties > System Protection to adjust how much space restore points use, or disable them entirely if you are comfortable with that risk.

Hibernation is a power mode that saves your entire system state to a file on disk. If you never use hibernation, you can disable it to free up space equal to your RAM (often 8 to 16 GB). Open Command Prompt as Administrator and type powercfg /h off. To turn it back on later, type powercfg /h on.

Frequently Asked Questions

Is it safe to delete everything in my Downloads folder?

Yes, as long as you have saved or installed anything you needed from it. The Downloads folder is meant to be temporary. If you downloaded an installer and already installed the program, the installer file is no longer needed. If you downloaded a document you needed, move it to Documents first, then delete the Downloads folder copy.

What happens if I delete a file and then need it back?

If you deleted it recently, check your Recycle Bin—right-click the file and select Restore. If the Recycle Bin is already empty, the file is much harder to recover. For important files, keep backups on an external drive or cloud storage before you delete anything.

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

Yes. Right-click your Documents folder, select Properties, go to the Location tab, and click Move. Choose your external drive as the new location. Windows will move all your files and automatically point to the new location. Do the same for Pictures, Videos, and Downloads if you want.

How much disk space should I keep free?

Windows runs best with at least 10 to 15 percent of your drive free. If your drive is nearly full, Windows slows down because it cannot create temporary files or cache. If you are consistently running out of space, consider upgrading to a larger drive or moving files to external storage permanently.

Will deleting temporary files break my programs?

No. Temporary files and cache are meant to be deleted. Programs will recreate them the next time they run. The only exception is if a program is currently running when you delete its cache—in that case, close the program first, then delete the cache.