Start by finding what's actually taking up room
Before you delete anything, you need to see which files and folders are using the most space. Windows and Mac both have built-in tools that show you this, and they work differently enough that the tool you use matters.
On Windows 10 or 11, open Settings, go to System, then Storage. Click on "Storage analysis" or the drive you want to check. Windows will scan and show you a breakdown by category — apps, documents, photos, videos, and temporary files. You can click into each category to see individual items and their sizes. This takes a few minutes on a full drive but shows you the real picture of where your space is going.
On Mac, open Applications, go to Utilities, and launch Disk Utility. Select your drive on the left, click the Info button, and you'll see total capacity and available space. For a detailed breakdown by folder, you'll need a third option: open Finder, click Applications, then Utilities, and use Activity Monitor to see what's running, or read a free tool like Disk Diag or OmniDiskSweeper that shows you folder sizes visually. The visual tools are faster for spotting the culprits.
Key Takeaways
- Use your operating system's built-in storage tool first — Windows Settings shows categories, Mac Disk Utility shows capacity — to see where space is actually going.
- Temporary files, old downloads, and duplicate photos are usually the fastest things to remove without losing anything you need.
- Move large files like videos, archived projects, or old backups to an external drive or cloud storage instead of deleting them.
- Empty your Recycle Bin or Trash after deleting, because files stay there until you do, still taking up space on your drive.
- Check your Downloads folder and Desktop regularly — both accumulate files that pile up over months without you noticing.
Clear out temporary files and caches safely
Temporary files are the easiest and safest things to delete because your system creates them constantly and doesn't need the old ones. These include browser cache, app caches, and Windows or Mac system temp files. Removing them frees up space without touching anything you created.
On Windows, use the built-in Disk Cleanup tool. Press Windows key + R, type cleanmgr, and press Enter. Check the boxes next to "Temporary files," "Recycle Bin," "Temporary internet files," and "Downloads" — these are all safe to remove. Click OK and let it run. For more aggressive cleanup, go to Settings > System > Storage > Temporary files and click "Remove files." This removes more categories including old Windows update files.
On Mac, you can't delete system cache the same way, but you can clear browser cache manually. In Safari, go to History > Clear History, select "all history," and click Clear. In Chrome, go to Settings > Privacy and security > Clear browsing data, select "All time," and check Cookies and cached images. You can also delete the Downloads folder contents if you've already moved or installed what you needed from there.
Remove duplicate and unwanted photos and videos
Photos and videos take up enormous amounts of space, and most people have duplicates, blurry shots, or videos they'll never watch again. A single hour of video can be several gigabytes. Removing duplicates and keeping only the best versions of each moment can free up tens of gigabytes without losing anything important.
On Windows, open Photos (built into Windows 10 and 11), go to Settings > Duplicate cleanup, and let it scan. It will show you potential duplicates side by side so you can choose which to keep. On Mac, open Photos, go to File > Find Duplicates, and review what it finds. Both tools let you delete the duplicates directly from the app.
For videos, open your Videos folder or wherever you store them, sort by date, and watch a few seconds of each to decide what to keep. Delete anything blurry, too short, or that you've already backed up elsewhere. If you have old phone backups or camera card transfers, check those folders too — they often contain hundreds of duplicates from syncing.
Move large files to external storage instead of deleting
If you have large files you might need later — old projects, archived documents, large video files, or complete photo libraries from years ago — moving them to an external drive or cloud storage is safer than deleting. This frees up your main drive's space while keeping the files accessible.
Connect an external drive, then drag your large folders into it. Create a folder structure on the external drive that matches what you had — for example, "2020 Projects" or "Old Photos" — so you can find things later. Once the transfer is done and you've verified the files are there, delete them from your main drive. External drives are inexpensive (a 2TB drive costs $50 to $100) and last for years if you keep them in a safe place.
For cloud storage, Google Drive, OneDrive, or Dropbox all work similarly. Upload your large folders, wait for the upload to finish, then delete the local copies. Cloud storage is slower than an external drive but accessible from any device. Many people use both — external drive for large files they rarely need, cloud storage for things they access from multiple computers or phones.
Uninstall programs you don't use
Applications take up space, and many of them you installed once and never opened again. Uninstalling removes the program and its associated files, freeing up several gigabytes if you have many unused apps.
On Windows, go to Settings > Apps > Apps & features. Scroll through the list, click on any app you don't use, and click Uninstall. Windows will walk you through removing it. Focus on large programs first — games, video editors, design software — because they take up the most room. Smaller utilities like browser extensions or system tools usually don't matter much.
On Mac, open Applications folder, drag unused apps to Trash, then empty Trash. Some apps leave behind preference files in your Library folder, but for most people this doesn't matter. If you want to be thorough, you can use a free uninstaller like AppCleaner that removes the app and its associated files at once.
Empty your Recycle Bin or Trash
This is the step people forget. When you delete a file, it goes to Recycle Bin (Windows) or Trash (Mac), and it stays there taking up space until you empty it. Files can sit in Trash for months without you realizing they're still using your drive's space.
On Windows, right-click the Recycle Bin icon on your desktop and select "Empty Recycle Bin." On Mac, click the Trash icon in your Dock, then go to Finder > Empty Trash. Both are when ready. Check how much space this frees up in your storage settings — it's often more than you'd expect.
Check your Downloads and Desktop folders regularly
Downloads and Desktop are where files pile up invisibly. You read an installer, install the program, and leave the installer sitting there. You save a document to Desktop "temporarily" and forget about it. Over months, these folders can hold gigabytes of files you don't need anymore.
Open your Downloads folder (usually in your user folder or accessible from your browser's read history). Sort by date, delete anything older than a few months, and delete any installers for programs you've already installed. Do the same with your Desktop — move important files into proper folders, delete duplicates and old versions, and keep only things you actually use regularly.
Set a reminder to do this monthly. Five minutes of cleanup each month prevents the situation where you suddenly have no free space and have to delete things in a panic.
Frequently Asked Questions
How much free space should I keep on my drive?
Keep at least 10 to 15 percent of your drive's total capacity free. For a 500GB drive, that's 50 to 75GB. Your system needs free space to create temporary files, install updates, and run smoothly. When you get below 5 percent free, your computer slows down noticeably.
Is it safe to delete files from the Windows temp folder?
Yes, it's safe to delete files from the temp folder. Windows creates temporary files constantly and doesn't need old ones. Use Disk Cleanup or Settings > Storage > Temporary files rather than manually opening the folder, because the built-in tools know which files are actually safe to remove.
What happens if I delete a file by mistake?
If you deleted it recently, check your Recycle Bin (Windows) or Trash (Mac) — you can restore it from there. If you already emptied the bin, recovery is much harder. For important files, consider using a recovery tool like Recuva (Windows) or Data Rescue (Mac), though success depends on how long ago you deleted it and what you've done since.
Can I delete Windows update files to free up space?
Yes, but carefully. Go to Settings > System > Storage > Temporary files and check "Previous Windows installation(s)" — this removes old versions of Windows from before your last update. Don't delete active system files. If you're unsure, use Disk Cleanup instead, which only shows you safe options.
Should I use cloud storage or an external drive for backups?
Both work, and many people use both. External drives are faster and cheaper for large amounts of data, but they can fail or get lost. Cloud storage is slower but accessible anywhere and automatically backed up by the service. For important files, use both — external drive for speed and cloud storage for safety.