Start with the files taking up the most space

The fastest way to free up storage is to find and delete the large files you no longer need. Most computers have a built-in tool that shows you which folders and files are using the most space. On Windows, open Settings, go to System, then Storage, and click "Storage analysis" — it will scan your drive and rank folders by size. On Mac, click the Apple menu, select "About This Mac", go to Storage, and click "Manage" to see what is using space.

Look for old video files, downloaded installers, and backup folders you have forgotten about. These often sit unused for months and take up gigabytes. Once you identify them, move them to an external drive if you want to keep them, or delete them if you do not. Emptying your Recycle Bin or Trash afterward actually removes the files from your drive.

Key Takeaways

  • Use your operating system's built-in storage analyzer to find which folders and files are largest, then delete or move the ones you no longer need.
  • Clear your Downloads folder, browser cache, and temporary files — these accumulate quickly and often contain duplicates or outdated installers.
  • Uninstall programs you no longer use through your system settings, not by dragging them to the trash, to remove all associated files.
  • Run disk cleanup or maintenance tools once a month to prevent clutter from slowing down your computer's performance.

Empty your Downloads folder and browser cache

Your Downloads folder is usually the first place clutter builds up. Open it and sort by date — anything older than a few months is probably something you downloaded once and forgot about. Delete old installers, PDFs, and files you have already moved elsewhere. This single step often frees up several gigabytes without any risk.

Browser cache is the temporary data your web browser stores to load pages faster. Over time it accumulates and takes up space. On Chrome, open Settings, click Privacy and Security, then Clear Browsing Data — select "All time" and check Cached Images and Files. On Firefox, go to Settings, Privacy, and scroll to Cookies and Site Data, then click Clear Data. On Safari, go to History menu and click Clear History, then choose "All history" from the dropdown.

Uninstall programs you do not use

Programs you installed once and never opened still take up space and can slow your computer down. On Windows, open Settings, go to Apps, then Apps and Features, and scroll through the list. Click any program you no longer use and select Uninstall. On Mac, open Applications folder, find the program, and drag it to Trash — some programs also include an uninstaller you should run first.

Be careful not to uninstall anything you are unsure about. If you do not recognize a program name, search for it online before removing it. Some programs are part of your operating system or required by other software. When in doubt, leave it alone.

Remove duplicate files and old backups

Many people end up with multiple copies of the same file without realizing it — photos backed up in two places, documents saved in both OneDrive and a local folder, or old versions of files you kept "just in case." These duplicates waste space. Search your computer for files with similar names or check your backup folders to see what is actually being stored.

If you use cloud storage like OneDrive, Google Drive, or iCloud, check whether your computer is syncing the entire folder locally. You can often change this to "online only" so files stay in the cloud and do not take up local space. This is especially useful for large photo libraries or document archives you rarely access.

Clean up temporary files and system clutter

Windows stores temporary files in a folder called Temp that you can safely delete. Press Windows key + R, type %temp%, and press Enter. Select all files in the folder (Ctrl + A) and delete them. Some files may be in use and will not delete — that is normal, just skip those. On Mac, temporary files are hidden by default, but you can use the built-in Disk Utility to run First Aid, which cleans up some system clutter.

Both Windows and Mac have built-in disk cleanup tools. On Windows, search for "Disk Cleanup" in the Start menu, select your drive, and check the boxes for Temporary Files, Recycle Bin, and Old Windows installations if they appear. Click Clean Up System Files for more options. These tools are safe to run and remove files your system no longer needs.

Disable startup programs that slow your computer down

Programs that launch automatically when you start your computer consume memory and slow down boot time. On Windows, open Task Manager (Ctrl + Shift + Esc), click the Startup tab, and look at the list. Right-click any program you do not need running at startup and select Disable. Common culprits are chat applications, cloud storage, and software update checkers.

On Mac, go to System Settings, click General, then Login Items. You will see a list of programs that open at startup. Click the minus button next to any you want to remove. Disabling startup programs does not uninstall them — they will still run when you open them manually, but they will not slow down your computer when you first turn it on.

Run maintenance once a month

Cleaning your computer is not a one-time task. Set a reminder to check your Downloads folder and run disk cleanup once a month. This prevents clutter from building up to the point where your computer slows down noticeably. Most of the steps above take only a few minutes if you do them regularly instead of waiting until your drive is nearly full.

If your computer is still running slowly after cleaning, the problem may be a failing hard drive, insufficient RAM, or malware rather than clutter. But in most cases, removing large unused files, clearing cache, and disabling startup programs will noticeably improve performance.

Frequently Asked Questions

Is it safe to delete files from the Temp folder?

Yes. Temporary files are meant to be deleted. Windows and Mac create new ones as needed. If a file is currently in use, your system will not let you delete it, so you cannot accidentally break anything by trying. Empty your Temp folder without worry.

What happens if I uninstall a program by mistake?

You can reinstall it. read the program again from the official website or app store and install it fresh. Your settings may not return, but the program itself will work normally. If you are unsure whether you need something, uninstalling it is a safe way to find out.

Will clearing my browser cache delete my passwords and saved information?

No. Cache is separate from saved passwords and login information. When you clear cache, you are only removing temporary files that speed up page loading. Your passwords and autofill data stay in place. You can choose what to delete in the cache settings.

How much space can I expect to free up?

It depends on how long you have owned the computer and what you store on it. Clearing Downloads and cache usually frees up one to five gigabytes. Removing old programs and large files you no longer need can free up much more — sometimes 20 to 50 gigabytes or more if you have years of accumulated backups or video files.

Should I use a third-party cleaning tool?

The built-in tools in Windows and Mac are sufficient for most people and are safer than third-party software. Some cleaning programs can remove files you actually need or slow down your system. Stick with Disk Cleanup on Windows and Disk Utility on Mac unless you have a specific reason to use something else.