Start by finding what's actually taking up space

Before you delete anything, you need to see which files and folders are using the most storage. Windows and Mac both have built-in tools that show you exactly where your space is going — this takes the guesswork out of what to remove.

On Windows 10 or 11, open Settings, go to System, then Storage. Click "Storage analysis" or "See storage usage" to get a breakdown by category: apps, photos, videos, documents, and temporary files. The system shows you the largest items first, so you can target what matters most. On Mac, click the Apple menu, select About This Mac, then Storage. You'll see a colored bar showing what's consuming your drive.

This step prevents you from deleting something important by accident. You might think videos are the problem when it's actually old Windows updates or duplicate photos taking up gigabytes.

Key Takeaways

  • Use your operating system's built-in storage tool to see exactly which files and folders are largest before you delete anything.
  • Temporary files, old Windows updates, and duplicate photos often take up far more space than you realize and are safe to remove.
  • Moving files to external storage or cloud services frees up space without losing them, which is safer than deletion.
  • Uninstalling unused programs and clearing your Downloads folder regularly prevents space problems from building up again.
  • If your drive is critically full, delete temporary files first, then move media files, then uninstall programs — in that order.

Remove temporary files and old Windows updates

Temporary files are the easiest and safest thing to delete. Windows creates these constantly — they're leftover pieces from installations, updates, and programs that no longer need them. Deleting them won't break anything because they're meant to be temporary.

On Windows, open Settings, go to System, then Storage. Click "Temporary files" and you'll see a list: Recycle Bin, temporary files, temporary app files, and old Windows installations. Check all of them and click Delete. This often frees up 5 to 20 gigabytes depending on how long it's been since you cleaned up. On Mac, temporary files are harder to access safely, so use the Storage recommendations built into the system instead: go to About This Mac, Storage, then Manage. Click "Empty Trash Automatically" and let the system handle old files.

If you see "Previous Windows installation(s)" in the list, that's safe to delete too. Windows keeps a backup of your old version for 10 days in case you need to roll back — after that, it's just taking up space.

Move photos and videos to external storage or cloud backup

Photos and videos are usually the largest files on a personal computer. Instead of deleting them, move them to an external drive or cloud storage so you keep them but free up your main drive.

Connect an external hard drive or USB drive to your computer. On Windows, open File Explorer and navigate to your Pictures, Videos, or Documents folders. Select the files or folders you want to move, right-click, and choose "Cut" (not Copy). Navigate to your external drive, right-click, and choose "Paste." The files move rather than copy, so they're removed from your PC. On Mac, use Finder the same way: select files, press Command+X to cut, navigate to your external drive, and press Command+V to paste.

If you prefer cloud storage, services like OneDrive (built into Windows), Google Drive, or iCloud let you upload files and access them from any device. Upload your oldest or least-used photos and videos, then delete them from your PC. This is slower than moving to an external drive but gives you backup protection — if your computer fails, your files are still safe.

Uninstall programs you don't use

Programs take up significant space, especially games and creative software. If you haven't opened something in months, removing it frees up gigabytes and also speeds up your system because Windows won't run background updates for it.

On Windows, open Settings, go to Apps, then Apps & features. Scroll through the list and look for programs you recognize but don't use. Click the program name and select Uninstall. Windows will walk you through the removal. On Mac, open Applications in Finder, right-click a program, and select Move to Trash. Some larger programs have their own uninstaller — look in the program's folder first.

Be cautious with anything you don't recognize. If you're unsure whether a program is safe to remove, search its name online first. System programs like Windows Defender or built-in drivers should stay. Programs with names like "Intel Management Engine" or "NVIDIA Control Panel" are usually drivers and should not be uninstalled.

Empty your Downloads folder and clear browser cache

Your Downloads folder accumulates files you've forgotten about — installers, documents, images, and old email attachments. Most of these can be deleted once you've used them. Browser cache is temporary data your web browser stores to load pages faster; clearing it is safe and often frees up several gigabytes.

On Windows, open File Explorer and navigate to Downloads. Select all files (Ctrl+A), review them quickly to make sure nothing important is there, then delete them. On Mac, open Finder, click Downloads in the sidebar, and do the same. For browser cache, open your browser settings: in Chrome or Edge, go to Settings, Privacy and security, Clear browsing data. Select "All time" and check "Cached images and files," then click Clear data. In Safari, go to History, then "Clear History," and select "All history."

Make this a monthly habit. Set a reminder to empty Downloads once a month so it doesn't build up again.

Compress large files if you need to keep them

Some files — like video projects, design files, or large archives — are too important to delete but take up enormous space. Compression reduces their size without losing the file itself, though it takes longer to open them.

On Windows, right-click a file or folder, select "Send to," then "Compressed (zipped) folder." Windows creates a smaller version with a .zip extension. On Mac, right-click and select "Compress." You can then move the compressed version to external storage and delete the original. When you need the file again, double-click the .zip and it expands back to normal size.

Compression works best on documents, images, and project files. Videos are already compressed, so zipping them saves little space. If you have a large video file you want to keep, moving it to external storage is more practical than compressing it.

Turn on cloud sync to prevent future buildup

Once you've cleared space, prevent the problem from happening again by letting cloud services automatically back up your files. This way, new photos and documents go to the cloud instead of filling your drive.

On Windows, open Settings, go to Accounts, then "Sync your settings." Turn on cloud sync for your files. You can also set OneDrive (which comes with Windows) to automatically upload your Documents, Pictures, and Desktop folders. On Mac, go to System Settings, click your Apple ID, then iCloud, and turn on iCloud Drive. Select which folders you want to sync.

This doesn't delete anything — it just stores copies in the cloud so your main drive doesn't get overwhelmed. You can still access files from your computer, but they're also backed up safely.

Frequently Asked Questions

Is it safe to delete everything in the Temp folder?

Yes. The Temp folder (usually at C:\Users\[Your Name]\AppData\Local\Temp on Windows) contains temporary files that programs create and forget about. Deleting them won't break anything. However, it's safer to use the Settings menu's "Temporary files" option instead, because Windows won't let you delete files that are currently in use.

What happens if I delete something from the Recycle Bin?

Once you empty the Recycle Bin, the file is much harder to recover. If you're not certain you want to delete something permanently, move it to an external drive first instead of deleting it. If you do delete it and change your mind, recovery software exists but is not may provide to work.

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

Yes, but it requires a few extra steps so your programs still know where to find your files. Move the folder to external storage, then right-click the Documents folder location in Settings and change the path to point to the external drive. This is more complex than moving individual files, so only do this if you have a large external drive you'll always keep connected.

How much space should I keep free on my hard drive?

Keep at least 10 to 15 percent of your drive empty. If your drive is 500 gigabytes, that means keeping at least 50 gigabytes free. Windows and Mac both slow down when the drive is nearly full because they need space to create temporary files while programs run.

Will clearing cache and temporary files speed up my computer?

Clearing temporary files frees up storage space, which helps if your drive is nearly full. Clearing browser cache speeds up browsing slightly because the browser has to read pages fresh instead of loading cached versions. The overall speed improvement is usually small unless your drive was critically full.