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I was frustrated when I tried to compact virtual hard disks from within Hyper V using the Edit Disk options so I resolved to find a better way to do so without using third party tools. It took me a bit of research to learn how to do this but after reviewing lots of options, I settled on the method below. I like the fact that you don't need to shrink partitions from within the guest operating system and you don't even need to zero out unused disk space as a lot of other guides recommended.
From an elevated command prompt type:
select vdisk file="C:\Hyper-V\sampledisk.vhdx"
attach vdisk readonly
This process reduced the size of my Master Image from 24GB to 15GB and takes seconds. It may sound too good to be true but I would be very happy to hear back from you if it worked for you.