When you delete files on your Mac, they don’t actually disappear; they sit in the Trash bin permanently until you manually right-click and select “Empty Trash.” If you forget to do this for several months, you might suddenly find your hard drive completely full of gigabytes of old files you thought you deleted. Fortunately, macOS has a built-in feature to automatically clear out old files on a rolling schedule.
How to Enable Auto-Empty
You can turn on the 30-day auto-delete feature directly from the Finder settings.
- Click on the Finder icon (the smiling face) in your Dock to make it the active application.
- In the very top-left corner of your screen, click on the word Finder in the menu bar.
- Select Settings… (or Preferences on older versions of macOS) from the dropdown menu.
- A small window will appear. Click on the Advanced tab (the gear icon) at the top of this window.
- Look for the checkbox labelled Remove items from the Trash after 30 days.
- Click the checkbox to enable it.
From now on, your Mac will act like a self-cleaning oven. When a file sits in the Trash for exactly 30 days, the operating system will silently and permanently erase it in the background, ensuring your hard drive never fills up with forgotten junk.