What's taking up your disc space and how to get it back

Your disc fills up because Windows, macOS, or Linux stores everything on it — the operating system itself, every program you install, every file you download, every photo and video, and temporary files left behind by programs that didn't clean up after themselves. When your disc gets full, your computer slows down because it can't create the temporary working space it needs. The fastest way to free up space is to delete files you don't need, empty your trash or recycle bin, and remove programs you no longer use.

Most people can recover 10 to 50 gigabytes just by clearing out downloads, old installers, and duplicate files. If you're running low on space right now, start with the steps in this guide — they work on Windows, Mac, and Linux, though the exact menu names differ slightly.

Key Takeaways

  • Your Downloads folder and Desktop often hold gigabytes of files you forgot about — check these first before doing anything else.
  • Emptying your Recycle Bin (Windows) or Trash (Mac) actually frees up space; files stay there until you empty it.
  • Uninstalling programs you no longer use through Control Panel or System Preferences removes them completely, not just shortcuts.
  • Temporary files and cache folders can be cleared safely using built-in tools, recovering several gigabytes without affecting your programs.
  • Check your disc usage before and after each step so you know which actions actually freed up space for you.

Check what's actually using your space

Before you start deleting, find out what's eating your disc. On Windows, right-click your C: drive (or whichever drive is full), select Properties, and look at the pie chart. On Mac, click the Apple menu, select About This Mac, then click Storage. On Linux, open a file manager, right-click the drive, and select Properties. This tells you how much space is used and how much is free.

Next, find which folders are the largest. On Windows, download WizTree (it's free) — it shows you every folder and file sorted by size, so you can see at a glance that your Downloads folder has 47 gigabytes or your Documents folder has old backups taking up space. On Mac, use Disk Diag or the built-in Storage tab in About This Mac. On Linux, open a terminal and type du -sh ~/* to list your home folder contents by size. This step takes five minutes and saves you hours of guessing.

Empty your Downloads folder and Desktop

Open your Downloads folder. Most people have years of installers, PDFs, old email attachments, and files they downloaded once and forgot about. Select all the files you recognize and don't need — usually this is safe because Downloads is meant to be temporary. If you're unsure about a file, right-click it and select Properties (Windows) or Get Info (Mac) to see when it was last opened. If it's been more than a year, you probably don't need it.

Do the same with your Desktop. Files on your Desktop are stored on your main drive, so a cluttered Desktop with old screenshots and documents actually takes up space. Move anything you want to keep into a proper folder in Documents, then delete the rest. This single step often frees up 5 to 20 gigabytes.

Empty your Recycle Bin or Trash

When you delete a file, it doesn't disappear — it goes to your Recycle Bin (Windows) or Trash (Mac) and stays there until you empty it. Right-click the Recycle Bin icon on your taskbar (Windows) or click Trash in your dock (Mac) and select Empty Recycle Bin or Empty Trash. On Linux, right-click the Trash icon and select Empty Trash. This actually frees up the space; until you do this step, deleted files are still taking up room.

Check your disc space again after emptying. You should see a noticeable jump in available space.

Uninstall programs you don't use

Every program installed on your computer takes up space, and many leave behind files even after you think you've removed them. On Windows, open Control Panel, select Programs and Features, find a program you don't use, click it, and select Uninstall. Follow the prompts to remove it completely. On Mac, open Applications, drag the program to Trash, then empty Trash. On Linux, open your package manager (Ubuntu Software, GNOME Software, or Synaptic depending on your distribution) and uninstall from there.

Start with obvious candidates: old versions of software, games you haven't played in a year, trial versions of programs you never bought, and duplicate programs (if you have both Firefox and Chrome but only use Chrome, remove Firefox). Large programs like Adobe Creative Suite, Microsoft Office, or video editing software can each take 5 to 20 gigabytes. Uninstalling three or four programs you don't use regularly can free up 30 to 50 gigabytes.

Clear temporary files and cache

Windows, macOS, and Linux all store temporary files that programs create while running. These files are supposed to be cleaned up automatically, but they often aren't. On Windows, press Windows key + R, type %temp%, and press Enter. Select all files in the folder that opens (Ctrl+A), then delete them. Some files may be in use and won't delete — that's fine, just skip those. Then do the same with %windir%\temp. This can free up 1 to 5 gigabytes.

On Mac, open Finder, press Cmd+Shift+G, type ~/Library/Caches, and press Enter. Look through the folders — most are safe to delete. Select the ones that are clearly old (check the date modified), then delete them. On Linux, open a terminal and type rm -rf ~/.cache/* to clear your user cache. Be careful with this command — it deletes files permanently without asking.

You can also clear your web browser cache, which can be several gigabytes if you've been using the same browser for years. In Chrome, Firefox, Safari, or Edge, press Ctrl+Shift+Delete (Windows/Linux) or Cmd+Shift+Delete (Mac), select All Time, check Cached Images and Files, and click Clear Data. This won't affect your saved passwords or bookmarks.

Move large files to external storage

If you have large files you want to keep but don't need on your main drive — old videos, photo libraries, archived projects, or backup folders — move them to an external hard drive or USB drive instead. Connect the external drive, open a file manager, and drag the folders to the external drive. Once the transfer is complete, delete them from your main drive. A single large video file can be 1 to 4 gigabytes; moving a folder of old projects can free up 20 to 100 gigabytes depending on what you have.

External drives are inexpensive (a 1-terabyte drive costs $50 to $100) and let you keep files without taking up space on your computer. This is especially useful for photo and video libraries, which grow quickly and are often backed up elsewhere anyway.

Check disc space again and monitor going forward

After completing these steps, check your disc space one more time. You should have noticeably more free space than when you started. Aim to keep at least 10 to 15 percent of your disc free — if your disc is 500 gigabytes, try to keep at least 50 gigabytes available. A disc that's more than 90 percent full will slow down noticeably.

Going forward, empty your Downloads folder once a month and empty your Recycle Bin or Trash when you delete files. Uninstall programs you're no longer using instead of letting them accumulate. These small habits prevent you from running out of space again.

Frequently Asked Questions

Is it safe to delete files from the temp folder?

Yes. Temporary files are meant to be deleted. Programs create them while running and should clean them up when they close. If a file is in use, Windows or Mac won't let you delete it, so you can't accidentally break anything. Delete what you can, skip what you can't.

What if I delete something important by mistake?

If you deleted it recently, check your Recycle Bin (Windows) or Trash (Mac) — files stay there for a while. Right-click the file and select Restore. If it's been longer, recovery software like Recuva (Windows) or Data Rescue (Mac) can sometimes recover deleted files, but success depends on how long ago you deleted it and whether the space has been overwritten.

Can I delete my Windows or Mac system files to free up space?

No. Don't delete anything in System32 (Windows), /System (Mac), or /usr (Linux). These folders contain files your operating system needs to run. Stick to Downloads, Desktop, Recycle Bin, and program uninstalls. If you're unsure whether a folder is safe to delete, don't touch it.

How much space should I keep free on my disc?

Keep at least 10 to 15 percent free. If your disc is 500 gigabytes, aim for 50 gigabytes free. If your disc is 1 terabyte, aim for 100 gigabytes free. A disc that's more than 90 percent full will slow down your computer noticeably because it can't create temporary working space.

Do I need to defragment my disc after clearing space?

On Windows with a traditional hard drive, defragmentation can help slightly, but it's not necessary. On Mac and Linux, don't defragment — it can actually harm your drive. If you have a solid-state drive (SSD) on any system, never defragment. SSDs work differently and don't benefit from defragmentation.