Start with the files taking up the most space

The fastest way to free up room on your computer is to find and delete the files that are actually using that space. Most computers have a built-in tool that shows you exactly which folders and files are largest. On Windows, open File Explorer, right-click your C: drive (or whichever drive is full), select Properties, and click "Disk Cleanup" or "Storage Sense". On Mac, click the Apple menu, go to About This Mac, then Storage, and you'll see a breakdown by category.

Look for folders like Downloads, Documents, Pictures, and Videos first — these are where large files pile up fastest. Video files, installer programs you no longer need, and old project folders often sit forgotten for months. Delete anything you recognize and no longer use. If you're unsure whether you need something, move it to an external drive or cloud storage instead of deleting it outright.

Key Takeaways

  • Use your operating system's built-in storage tool to see which folders are using the most space, then delete or move files you no longer need.
  • Uninstall programs you don't use through your system settings, not by deleting their folders manually.
  • Clear your browser cache and temporary files regularly, which can free up several gigabytes without affecting your work.
  • Move large files like videos, photos, and backups to an external drive or cloud storage to keep your main drive running smoothly.
  • Run a disk cleanup or maintenance tool once a month to remove leftover installer files and system junk.

Uninstall programs you're not using

Programs you installed and forgot about take up space and can slow down your computer's startup time. Go to your system settings and look for "Apps" or "Programs and Features" (Windows) or "Applications" (Mac). Scroll through the list and uninstall anything you haven't opened in months. Don't just delete the program folder from your hard drive — use the uninstall option in settings, which removes all the related files the program created.

Be cautious with programs that came pre-installed on your computer. Some are tied to your operating system and shouldn't be removed. If you're unsure whether something is safe to uninstall, search the program name online before removing it. Common safe removals include old versions of software, trial programs that expired, and games you no longer play.

Clear your browser cache and temporary files

Your web browser stores copies of every webpage you visit, along with images and other files, so pages load faster next time. Over months or years, this cache can grow to several gigabytes. Open your browser settings and look for "Clear browsing data" or "Clear cache". Select "All time" or "Everything" to clear the entire cache, not just the last week. Do this for every browser you use — Chrome, Firefox, Safari, Edge, or others.

Windows also stores temporary files in a folder called Temp. You can delete these safely through Disk Cleanup (mentioned above) or by opening File Explorer, typing %temp% in the address bar, and deleting the contents. Mac users can use the built-in Storage tool or a third-party cleaner, though macOS is generally better at cleaning up after itself automatically.

Move large files to external storage

If your computer is full but you want to keep your files, move them to an external hard drive or cloud storage service. External drives are inexpensive — a 1 or 2 terabyte drive costs between $50 and $100 and can hold thousands of photos, videos, and documents. Plug it in, copy your large files over, and then delete them from your computer. Your files are still there if you need them, but they're not taking up space on your main drive.

Cloud storage services like Google Drive, OneDrive, or Dropbox let you store files online instead. These are useful if you need to reach your files from multiple devices. Be aware that free accounts usually offer only 15 to 50 gigabytes of space, so they work best for documents and photos rather than large video files. If you choose cloud storage, make sure the files are actually uploaded before you delete them from your computer.

Disable startup programs and background processes

Many programs are set to start automatically when you turn on your computer, which slows down startup time and uses memory even when you're not using them. On Windows, open Task Manager (press Ctrl+Shift+Esc), click the Startup tab, and disable anything you don't need running in the background. On Mac, go to System Settings, General, Login Items, and remove programs from the list.

Be selective here — some programs like antivirus software should stay enabled. But things like Spotify, Slack, or Adobe Creative Cloud don't need to start automatically unless you use them the moment you turn on your computer. Disabling unnecessary startup programs won't free up disk space, but it will make your computer feel faster and more responsive.

Run a disk cleanup or defragmentation tool

Windows includes a built-in Disk Cleanup tool that removes installer files, temporary system files, and other junk. Open Settings, go to System, Storage, and click "Cleanup recommendations" or "Temporary files". Select what you want to delete and run the cleanup. This is safe to do monthly and usually frees up a few hundred megabytes to a few gigabytes depending on how long it's been since you last cleaned.

Mac users don't need to defragment their drives the way Windows users do — macOS handles this automatically. However, you can use the Storage tool in About This Mac to see what's taking up space and remove large or old files manually. If your Mac feels slow, restarting it often helps more than any cleanup tool.

Check for duplicate files and old backups

Over time, you may end up with multiple copies of the same file — a photo you edited several times, a document with multiple versions, or backup folders you forgot about. Search your computer for files with similar names or look in backup folders like Time Machine (Mac) or System Image backups (Windows). Delete the versions you don't need, keeping only the most recent or best version of each file.

System backups can be especially large. If you have an older backup you no longer need, you can delete it safely. On Mac, open Time Machine preferences and remove old backup drives. On Windows, go to Settings, System, Storage, and look for "Backup" or "System Image" to delete old backups. Just make sure you have a current backup before you delete an old one.

Frequently Asked Questions

Is it safe to delete files from the Temp folder?

Yes, temporary files are designed to be deleted. Windows and Mac create these files to help programs run, but they're not needed after the program closes. You can safely delete everything in the Temp folder. If a program is currently using a temp file, your computer will prevent you from deleting it, so there's no risk of breaking anything.

Will cleaning up my computer make it faster?

Freeing up disk space helps, especially if your drive is nearly full. However, the biggest speed improvements usually come from disabling startup programs and closing background processes. If your computer is slow and your drive has plenty of free space, the problem is likely memory or processor usage, not storage.

Should I use a third-party cleaning tool?

Your operating system's built-in tools are usually enough. Third-party cleaners like CCleaner can work, but they're not necessary and some can be aggressive about what they delete. Stick with Windows Disk Cleanup, Mac Storage, and manual file deletion unless you have a specific reason to use something else.

What's the difference between deleting a file and emptying the recycle bin?

When you delete a file, it goes to the Recycle Bin (Windows) or Trash (Mac), where it still takes up space. You have to empty the Recycle Bin or Trash to actually free up that space. Once you empty it, the space is marked as available, though the file data may still be recoverable with special tools for a short time.

How often should I clean up my computer?

Once a month is a good routine. Clear your browser cache monthly, run Disk Cleanup every month or two, and uninstall programs as soon as you know you won't use them. If you read a lot of files or install programs frequently, you may want to clean up more often.