This tutorial will help you shrink ANY image file you have with gparted on Linux, or via the Raspberry Pi itself !
Have you ever tried to backup your SD card onto an image file and shared it to someone else? You probably heard that they weren’t able to burn it to the SD because it’s too big. You can reduce the file size by shrinking the size of your image.
Note: you may need to type /pishrink.sh filename.img (whereby filename = the name of the file!) in order for this to work in some cases!
Linux Mint: DOWNLOAD HERE
Virtual Clone Drive: DOWNLOAD HERE
Pishrink Script: DOWNLOAD HERE
Virtual Machine: DOWNLOAD HERE