To quickly free up disk space on Mac, the first thing you should do is empty the Trash and delete large files from the Downloads folder. Go to Apple menu > About This Mac > Storage > Manage to check recommendations and uninstall the apps you don't use. Besides clearing browser cache, you should also clean the cache files of your apps to recover some hidden storage. Delete the backups of iPhones or iPads that you no longer need, which are stored in Finder. Besides duplicate files, screenshots that you don't need, and large videos, you should also remove. Additionally, you have the option of moving files to iCloud Drive or to an external drive. After that, to make sure the system recalculates and accurately displays the freed storage, you should restart your Mac.