How to create partitions on qcow2 image without reserving disk size

I want to install archlinux in UEFI mode so, I created image from virt-manager with size of 20GB. Then after booting into VM, I created 2 partition with fdisk named /dev/vda1 and /dev/vda2 with 512MB and what remained (19.5~GB) I changed the type of /dev/vda1 to EFI from fdisk and then formated it with mkfs.fat -F32 /dev/vda1 Then I formated the /dev/vda2 to ext4 using mkfs.ext4 /dev/vda2 and then I successfully installed arch on it. The output of du -h -d 0 / on guest gives 5.2GB. But the actual disk size of image on host is 20GB which is same as Virtual size sudo qemu-img info archlinux.qcow2 image: archlinux.qcow2 file format: qcow2 virtual size: 20 GiB (21474836480 bytes) disk size: 20 GiB cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: true refcount bits: 16 corrupt: false I also have windows 10 installed on qcow2 image and It only show 9.73 disk size as expected. I didn't create any extra esp partitions during windows installation as I installed it in bios mode and it boots with seabios sudo qemu-img info win10.qcow2 [sudo] password for root: image: win10.qcow2 file format: qcow2 virtual size: 100 GiB (107374182400 bytes) disk size: 9.73 GiB cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: true refcount bits: 16 corrupt: false So what am I doing wrong here ? How can create partitions on qcow2 image without reserving partition size on disk ?