How to Clean Up Memory on a Laptop

Over time, every laptop collects clutter: temporary files, old downloads, browser cache, and programs you installed once and forgot. This guide shows you how to safely remove that clutter and free up both storage space (the hard drive or SSD) and working memory (RAM). You don’t need any special tools—just the built-in utilities in Windows or macOS.

What You’ll Need

About 30 minutes of uninterrupted time
Your laptop charger (so it doesn’t shut down mid-process)
Admin access to your user account (you’ll need it to uninstall programs)
An external drive or cloud storage if you plan to move large files

Step-by-Step

Save your work and restart the laptop. A fresh start clears the RAM completely and stops background processes that may be holding memory. Save any open documents, then click Restart (Windows: Start > Power > Restart; macOS: Apple menu > Restart).
Close unnecessary programs and browser tabs. After restarting, open Task Manager (Windows: Ctrl+Shift+Esc) or Activity Monitor (macOS: Cmd+Space, type “Activity Monitor”). Look for apps using high memory (the Memory column). Right-click (or two-finger click) and select End Task / Quit for anything you’re not actively using. Close browser tabs you don’t need—each tab uses RAM.
Check what’s taking up storage space. Go to Settings > System > Storage (Windows) or Apple menu > System Settings > General > Storage (macOS). This shows a breakdown of what’s using space: apps, documents, system files, etc. Note the biggest categories.
Delete temporary files. Windows: Open Settings > System > Storage, click “Temporary files,” select the checkboxes for items like “Temporary Internet Files” and “Delivery Optimization Files,” then click “Remove files.” macOS: Go to Finder > Go > Go to Folder, type ~/Library/Caches, and delete the contents of that folder (but not the folder itself). You can also use the built-in “Optimize Storage” in macOS to remove watched movies and old trash.
Empty the Recycle Bin / Trash. Right-click the Recycle Bin on your desktop (Windows) or the Trash icon in the Dock (macOS) and select “Empty Recycle Bin” / “Empty Trash.” Files you deleted earlier are still taking up space until you do this.
Uninstall programs you don’t use. Windows: Go to Settings > Apps > Installed apps, sort by size, and click Uninstall on any program you haven’t opened in months. macOS: Drag the app from the Applications folder to the Trash, then empty the Trash. Be careful not to uninstall system apps or drivers you need.
Move large files to external storage or the cloud. Use the storage breakdown to find large files (videos, old projects, backups). Move them to an external drive or upload to Google Drive, OneDrive, or iCloud. Then delete the local copies.
Restart again and verify the improvement. After cleaning, restart your laptop once more. Open Task Manager or Activity Monitor and check that memory usage is lower. Repeat steps 3–5 if needed.

Common Mistakes

Deleting system files you don’t understand. Stick to the temporary files that Windows or macOS suggests. Don’t go into System32 or the Library folder and remove random files—you could break your system.
Uninstalling programs that are part of the OS. For example, don’t remove Microsoft Edge or Safari—they’re integrated into the system. Only uninstall third-party apps you installed yourself.
Using “cleaner” apps that promise to boost memory. Many of these are unnecessary and can be bundled with adware. The built-in tools are enough.
Not restarting after cleaning. Some memory is only freed after a reboot. If you skip the final restart, you might not see any improvement.

Tips

Set a monthly reminder. Spend 15 minutes each month doing the same steps to keep your laptop fast.
Use the browser’s built-in cleanup. In Chrome or Edge, go to Settings > Privacy > Clear browsing data to remove cached files—this frees RAM and storage.
Turn off startup programs. In Task Manager (Windows) or System Settings > Users & Groups > Login Items (macOS), disable apps that launch at startup. They eat memory in the background.
If you have an SSD, don’t defragment it. Defragmenting is for old hard drives; on an SSD it wastes time and causes wear. Windows automatically optimizes SSDs, so leave it alone.

Troubleshooting

If the laptop is still slow after cleaning: Check if you have enough free storage (at least 10% of the drive). If not, repeat steps 4–6. Also, consider upgrading RAM if your laptop allows it—this is a hardware change, not a cleaning step.

If you accidentally deleted a file you needed: Check the Recycle Bin / Trash before emptying it. If you’ve already emptied it, you may need to restore from a backup (File History on Windows, Time Machine on macOS).

If a program won’t uninstall: Use the official uninstaller from the program’s website, or run the installer again and choose “Repair” or “Remove.” For stubborn apps, use the built-in “Add or Remove Programs” tool, not just dragging to Trash.

If the storage breakdown shows “System” files taking huge space: This is normal on macOS (the System data includes caches, logs, and Time Machine snapshots). Don’t try to delete them manually. Instead, use the “Optimize Storage” tool in macOS or the “Storage Sense” in Windows.

Frequently Asked Questions

How often should I clean up my laptop’s memory?

Once a month is a good routine. If you download a lot of files or install many apps, you might need to do it every couple of weeks.

Will cleaning up memory delete my personal files?

No—the steps above only remove temporary files, cache, and programs you choose to uninstall. Your documents, photos, and music are untouched unless you manually delete them.

What’s the difference between RAM and storage memory?

RAM is the short-term memory your laptop uses to run apps; it’s cleared when you restart. Storage (hard drive or SSD) is where your files live. This guide covers both, but they’re managed differently.

Is it safe to delete all temporary files?

Yes, temporary files are meant to be discarded. Windows and macOS will recreate them as needed. However, if you’re using an app that’s currently open, close it first so it doesn’t try to write to a file you’re deleting.

Do I need to buy a cleaning software?

No. The built-in tools in Windows and macOS are sufficient for almost everyone. Third-party cleaners often cause more problems than they solve.

Why is my laptop still slow after cleaning?

If you’ve freed up storage and closed background apps, the slowness may be due to a failing hard drive, too little RAM for your workload, or malware. Run a virus scan, and consider upgrading hardware if the laptop is old.

Sources: Microsoft Support. Menus and buttons can differ slightly by version. Spotted something out of date? Tell us.