How to clear storage on Mac: free up space step by step

1. Check what is using space

Open System Settings → General → Storage. The bar shows how macOS groups your files: Applications, Documents, Photos, Mail, Messages, macOS itself and System Data, which Apple describes as files that do not fall into the other categories, primarily logs, caches, virtual memory and other runtime resources. The information button next to each category lists what it holds.

Write down the available space and the two or three largest categories before changing anything. A number you can compare against later is the only reliable way to know whether a step worked, because the bar can take a while to refresh and some categories change on their own.

2. Use the built-in recommendations, knowing what each does

Storage settings offers a short list of recommendations. Store in iCloud keeps recent files on the Mac and moves older ones to iCloud Drive, which frees local space only while you have iCloud storage to spare. Optimize Storage removes movies and TV shows you have already watched. Empty Trash Automatically deletes items that have been in the Trash for 30 days.

These are Apple’s own controls and they are the safest place to start. Read what each one changes before turning it on: Store in iCloud, in particular, changes where your files live, not just how much space they use.

3. Clear the obvious space

Apple’s own checklist covers most everyday clutter: the Downloads folder, apps you no longer use, junk and deleted items in Mail, and the Trash itself. A file you move to the Trash keeps using space until you empty it, so emptying the Trash is often the single largest immediate gain.

• Downloads: sort by size and date. Installers and disk images you have already used can usually go.
• Applications: remove apps you have not opened in months; move them to the Trash from the Applications folder or uninstall through the app’s own method if it has one.
• Mail: erase junk and deleted messages from within Mail rather than hunting for its files.
• Trash: empty it, then compare the available space with your note from step one.

4. Move large media instead of deleting it

Videos, photo libraries and project archives are often the biggest files and the least replaceable. Apple’s guidance is to move them to an external drive rather than delete them. Copy first, open the copy and check it, then remove the original. The Photos library has its own relocation steps, covered in the linked guide.

Moving a file between folders on the same drive frees nothing. Only a different volume, a cloud tier that removes the local copy, or deletion changes the number.

5. Review System Data last, and know when to stop

If the categories you recognise are tidy and the disk is still short of room, System Data is usually where the remainder lives. Treat it as a category to inspect, not a folder to empty: the System Data guides linked below explain how to find the files behind the number and which ones to leave alone.

Stop when you have the room you need for the task in front of you. Chasing the last few gigabytes is where most cleanup mistakes happen. ClearDisk’s free scan shows the same categories with the paths behind them, which makes the review in this step faster; deleting by hand remains your decision either way.