Start with the files taking up the most room
The fastest way to free up space is to find and remove the largest files and folders first. Most operating systems let you see which items are using the most storage, and targeting those saves you time — deleting ten large files does more than deleting a hundred small ones.
On Windows, open File Explorer, right-click your C: drive (or whichever drive is full), select Properties, then click "Disk Cleanup" or use the Storage settings panel. On Mac, click the Apple menu, go to About This Mac, then Storage, and you'll see a breakdown by category. Both systems show you exactly what's consuming space, ranked from largest to smallest.
Start by looking at your Downloads folder, Desktop, Documents, and Pictures — these accumulate files quickly and often hold duplicates or things you no longer need. Delete old installers, screenshots you don't need, and files you've already backed up elsewhere.
Key Takeaways
- Check your Downloads, Desktop, and Documents folders first — they typically hold the largest unnecessary files and are easiest to clean manually.
- Use your operating system's built-in storage tools to see which files and folders are using the most space before you start deleting.
- Move large media files (videos, photos, music) to external drives or cloud storage rather than deleting them if you want to keep them.
- Empty your Recycle Bin or Trash after deleting files, since deleted items still take up space until the bin is emptied.
- Temporary files, cache, and old system backups often hold gigabytes of space you can reclaim without losing anything you need.
Move media files to external storage instead of deleting them
Videos, photos, and music files are often the largest items on a drive. If you want to keep them but need the space, moving them to an external hard drive or cloud storage is faster and safer than deleting them outright.
External drives are inexpensive — a 1 or 2 terabyte external hard drive costs $50 to $100 and can hold thousands of photos and videos. Cloud storage services like Google Drive, OneDrive, or Dropbox let you access files from any device, though they charge monthly fees for large amounts of storage. Create a folder on the external drive or cloud service, move your media files there, and verify they arrived before you delete them from your computer.
This approach is especially useful for video files, which can easily consume 5 to 50 gigabytes each. You keep the files without sacrificing your computer's performance.
Clear out temporary files and cache
Your computer stores temporary files, browser cache, and process data that accumulate over time. These files are meant to speed up performance, but old ones just take up space. Clearing them out is safe — your computer will recreate them as needed.
On Windows, use the Disk Cleanup tool (search for it in the Start menu) and check the boxes for Temporary Files, Recycle Bin, and Temporary Internet Files. On Mac, you can manually navigate to Library > Caches and Library > process Support to delete old cache folders, though this requires more care to avoid deleting active process data.
Browser cache can also consume several gigabytes. In Chrome, Firefox, Safari, or Edge, go to Settings, find the Privacy or History section, and clear browsing data. Select "All time" to remove everything, not just recent data.
Remove old system backups and restore points
Windows creates automatic system restore points and backups that can consume 10 to 50 gigabytes or more. If your drive is full, older restore points are often safe to delete since you're unlikely to need them.
On Windows, search for "Disk Cleanup" and run it as administrator. Check the box for "System files" and look for "Previous Windows installations" or "System restore points" — these are candidates for deletion. You can also go to Settings > System > Storage > Temporary files and delete older backups there.
On Mac, Time Machine backups can grow very large. If you're using an external drive for backups, you can delete older snapshots through Time Machine settings. If backups are stored on your main drive, consider moving them to external storage or disabling automatic backups temporarily while you free up space.
Uninstall programs you no longer use
Applications you installed but no longer use take up space and can slow your system down. Removing them is straightforward and often frees up several gigabytes.
On Windows, go to Settings > Apps > Apps & features, find the program you want to remove, click it, and select Uninstall. On Mac, open Applications, drag unused programs to the Trash, then empty the Trash. Some programs leave behind preference files or support folders — these are usually small, but if you want to remove them completely, you can use a utility like AppCleaner (free on Mac) to find and delete all related files.
Start with programs you recognize and know you don't use. Be cautious about removing system programs or anything you're unsure about.
Empty your Recycle Bin or Trash
Deleted files sit in your Recycle Bin (Windows) or Trash (Mac) until you empty it. They still take up hard drive space during this time. Emptying the bin is the final step after you've deleted files.
On Windows, right-click the Recycle Bin icon on your desktop and select "Empty Recycle Bin." On Mac, click the Trash icon in the Dock, then select "Empty Trash" from the menu. This permanently removes the files and frees up the space they were using.
Check for duplicate files
Many people end up with multiple copies of the same file — photos backed up to different folders, documents saved in several places, or downloads that weren't deleted after installation. Finding and removing duplicates can free up significant space.
For a manual approach, search your Downloads and Documents folders for files with similar names or creation dates. For a more thorough search, free tools like Duplicate File Finder (Windows) or Gemini Photos (Mac) scan your entire drive and show you duplicates grouped together. Review the results carefully before deleting, since these tools sometimes flag similar but different files.
Photos are a common source of duplicates — phones and cameras often create backups, and cloud services may sync copies. Review your Pictures folder and cloud storage folders for multiple versions of the same image.
Frequently Asked Questions
How much space should I keep free on my hard drive?
Most experts recommend keeping at least 10 to 15 percent of your drive free for your operating system to function smoothly. On a 500 gigabyte drive, that means keeping at least 50 to 75 gigabytes empty. If your drive is fuller than that, your computer will slow down noticeably.
Is it safe to delete files from the Windows folder or Program Files?
No. Avoid deleting anything from Windows, Program Files, or System folders unless you're certain what you're doing. Stick to your personal folders like Downloads, Documents, Pictures, and Desktop. If you're unsure whether a file is safe to delete, leave it alone.
What's the difference between moving files to cloud storage and deleting them?
Moving files to cloud storage keeps them accessible from any device with internet access, while deleting removes them from your computer entirely. Cloud storage costs money for large amounts but is safer if you want to keep the files. Deleting frees up space permanently but means you lose the files unless you have a backup.
Will clearing my browser cache slow down my internet?
No. Clearing cache frees up hard drive space without affecting internet speed. Your browser will rebuild the cache as you browse, which may make the first visit to frequently used websites slightly slower, but this is temporary and usually unnoticeable.
Can I recover files after I empty the Recycle Bin?
Recovery is possible but difficult and often requires paid software. Once you empty the Recycle Bin, the space is marked as available for new files, which can overwrite the deleted data. If you've just emptied the bin and haven't used your computer much since, recovery tools may work. The longer you wait, the less likely recovery becomes.