Start by seeing what's taking up space

Before you delete anything, you need to know what's actually using your storage. Open Finder, click your hard drive name in the sidebar (usually "Macintosh HD"), then go to the menu bar and select File > Get Info. A window will show you how much space is used and how much is free. If you're below 10% free space, your Mac will slow down noticeably.

To see which files and folders are the biggest culprits, use the built-in Storage tool. Click the Apple menu in the top-left corner, select About This Mac, then click the Storage tab. You'll see a colored bar showing what's consuming space — usually Applications, Documents, Photos, or System Data take up the most room. Click any category to drill down and see individual items.

Key Takeaways

  • Check your free space first using About This Mac > Storage, which shows exactly what's consuming your drive.
  • Empty the Trash bin and clear your Downloads folder, which often holds files you no longer need.
  • Delete duplicate photos and old backups, which are frequently the largest space hogs on a Mac.
  • Move large files like videos or archived projects to an external drive or cloud storage to free up internal space without losing them.
  • Clear browser cache and temporary files only if you're comfortable with basic system maintenance — this is optional and rarely necessary.

Empty your Trash and Downloads folder

The fastest way to reclaim space is to empty your Trash bin. Right-click the Trash icon in your Dock and select Empty Trash. This permanently deletes files you've already sent there. If you haven't emptied Trash in months, this alone can free up several gigabytes.

Next, check your Downloads folder. Open Finder, click Downloads in the sidebar, and look for files you no longer need — old installers, PDFs, or documents you've already moved elsewhere. Select the files you want to remove, press Delete, then empty Trash again. Many people accumulate months or years of downloads without realizing it.

Remove duplicate and blurry photos

Photos are often the biggest space consumer on a Mac. Open the Photos app and look for duplicates — these happen when you import the same photo twice or sync from multiple devices. Click Photos > Preferences, then the General tab, and make sure "Copy items to the Photos library" is checked. This prevents duplicates from being stored in multiple places.

To find and remove duplicates manually, sort your library by date and look for identical images taken seconds apart. Select the duplicate and press Delete, then confirm you want to remove it from the library. You can also delete blurry photos, screenshots you no longer need, or burst photos where you only want to keep one. Even removing 500 mediocre photos can free up a gigabyte or more.

Delete old backups and cache files

Your Mac creates automatic backups and temporary files that pile up over time. In Finder, press Command + Shift + Period (the period key) to show hidden files. Look for folders like .Trash, .cache, and Library/Caches. These contain temporary data your applications use but don't need permanently.

Be cautious here — only delete cache files you recognize. If you use Time Machine for backups, old snapshots can consume significant space. Open System Settings, click General > Storage, then look for "Backups" in the list. You can delete old backups by clicking them and selecting the delete option, but keep at least your most recent backup in case you need to restore files.

Move large files to external storage

If you have large video projects, archived documents, or old work folders you rarely access, moving them to an external drive or cloud storage is faster than deleting them. Connect an external hard drive or USB drive to your Mac, then drag folders directly into it. This removes them from your internal drive while keeping them accessible if you need them later.

Cloud storage services like iCloud Drive, Google Drive, or Dropbox also work well for this. Upload folders you don't use daily, then delete the local copies from your Mac. You can still open these files from the cloud when needed, but they won't take up internal space. This is especially useful for old project files, tax documents, or media you want to keep but don't access regularly.

Uninstall applications you don't use

Applications take up space, especially large ones like video editors, design software, or games. Open Finder, click Applications in the sidebar, and look for programs you haven't opened in months. Drag unused applications to Trash, then empty Trash. Some large apps can free up several gigabytes when removed.

Be selective — only remove applications you're certain you won't need. If you're unsure, leave it installed. You can always remove it later if space becomes critical again. After deleting an app, check your Storage tab again to confirm the space was actually freed up.

Clear browser cache if needed

Web browsers store cached images, cookies, and temporary files to load websites faster. Over time, this cache can grow to several gigabytes. In Safari, click Safari > Settings, go to the Privacy tab, and click Manage Website Data. Select Remove All to clear everything, or select specific websites and click Remove.

In Chrome, click the menu (three dots), go to Settings > Privacy and security > Clear browsing data, make sure "Cached images and files" is checked, and click Clear data. This is optional — clearing cache won't harm your Mac, but it's rarely necessary unless you're desperate for space. Your browser will rebuild the cache as you browse, so the freed space may fill up again over time.

Frequently Asked Questions

How much free space should I keep on my Mac?

Aim for at least 10% of your total drive capacity free at all times. If your drive is nearly full, your Mac will slow down significantly and may refuse to install updates. For a 256GB drive, that means keeping at least 25GB free. If you consistently run low on space, consider moving files to external storage or upgrading your drive.

Will deleting cache files break my applications?

No. Cache files are temporary data that applications rebuild automatically. Deleting them is safe and won't damage any programs. Your apps may take slightly longer to load the first time after clearing cache, but they'll function normally. Only delete cache files you recognize — avoid deleting anything in System folders unless you're certain what it does.

Can I recover files after emptying Trash?

Once you empty Trash, recovery is difficult and requires specialized software. Before emptying Trash, double-check that you actually want to delete the files inside. If you accidentally deleted something important, stop using your Mac immediately and contact a data recovery service — the longer you wait, the less likely recovery becomes.

What's the difference between moving files and deleting them?

Moving files to external storage or cloud services removes them from your internal drive but keeps them accessible. Deleting files removes them from your Mac entirely. Moving is safer if you might need the files later; deleting is permanent. For large files you rarely use, moving to external storage is usually the better choice.

Why is my Mac still slow after freeing up space?

Slow performance isn't always about storage space — it can also be caused by too many applications running at startup, insufficient RAM, or a full cache. Check System Settings > General > Login Items to see what launches automatically, and close programs you don't need running. If slowness persists after freeing space, restart your Mac or contact Apple Support.