There are several ways to increase available disk space. You can delete large or unused files, move files off your Mac, and compress files and folders to save space. For more information about compressing files, see Compress or uncompress files and folders.
To find out how much disk space you have, choose Apple menu > About This Mac, then click Storage.
In Mail, choose Mailbox > Erase Deleted Items > In All Accounts, and Mailbox > Erase Junk Mail.
You can also check the other apps you use for ways to remove or compress items.
Items you download from the Internet are in your Downloads folder. If you have many unneeded downloaded items, delete them. It’s a good idea to delete items you don’t need in order to free up disk space.
You can find your largest files and then compress them or move them to another disk.
In the Finder, choose Go > Home, or press Shift-Command-H.
Choose File > Find, or press Command-F.
Click the Kind pop-up menu, then choose Other.
Below “Select a search attribute,” select the File Size checkbox. Make sure no other checkboxes are selected, then click OK.
Click the “equals” pop-up menu, then choose “is greater than.” Click the “KB” pop-up menu, then choose “MB.”
Enter a minimum file size. A good starting point is 100 MB. You can change the value to see more or fewer results.
Searching begins as soon as you type a file size. It may take a moment for all the search results to appear.
Move files and folders you don’t often use to an external disk, or to a disk connected to your AirPort or other network. For more information, see Use external storage devices.
Burn files and folders to a CD or DVD. For more information, see Burn CDs and DVDs.
After the files are copied, you can delete the copies on your Mac.