Shred will allow you to free space easily. All you need to do in order to take its capabilities for a spin is drag and drop any file or folder, with the app being able to work in batch mode as well.
License Free
File Size 216.68 kB
Version 1.1
Operating System Mac OS X 10.11 Mac OS X 10.9 Mac OS X 10.10 Mac OS X 10.8 macOS 10.12 Sierra Macintosh Mac OS X 10.7
System Requirements Java 8