Free online QCOW to VHDX converter
Convert QCOW disk images to VHDX for use in Hyper-V and Windows virtualization.
Convert QCOW to VHDX online - free
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How to convert qcow to vhdx file
- Virtualization
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Source format: qcow
QCOW is a QEMU copy-on-write disk image format used mainly with QEMU and KVM virtualization. It stores a virtual machine’s disk contents in a file and supports features such as snapshots, thin provisioning, and efficient space usage through copy-on-write behavior. QCOW is commonly used for Linux-based virtual machines, testing environments, and portable VM images managed by QEMU tools.
Target format: vhdx
VHDX is Microsoft’s newer Virtual Hard Disk format, used primarily by Hyper-V and other Microsoft virtualization tools. Compared with older VHD files, VHDX supports larger capacities, better resilience against corruption, and improved performance for modern virtual machines. It is a common choice when moving a VM disk image into a Windows virtualization environment.
How to convert qcow to vhdx
The most reliable way to convert qcow to vhdx is with qemu-img, which is part of the QEMU toolkit and is widely available on Linux, macOS, and Windows.
- Install QEMU tools if they are not already present.
- Open a terminal or command prompt.
- Run a conversion command such as
qemu-img convert -f qcow2 -O vhdx source.qcow2 destination.vhdx. - If your file uses the older QCOW format, adjust the input format accordingly, for example
qemu-img convert -f qcow -O vhdx source.qcow destination.vhdx. - After conversion, verify the result with
qemu-img info destination.vhdx.
If you prefer a graphical workflow, some virtualization managers can export or convert disk images, but qemu-img is usually the best choice because it preserves the disk contents directly and gives you precise control over the output format. You can also convert the file on 101convert.com for free, without installing any software.
Notes on quality and compatibility
The conversion is usually lossless at the disk-image level: the file system and data inside the virtual disk are copied, not re-encoded. However, the resulting VHDX file may not boot in Hyper-V if the guest OS depends on hardware or firmware settings that differ from the original QEMU/KVM environment. In some cases you may need to adjust the VM’s controller type, boot mode, or drivers after conversion.
Also note that qcow images may contain snapshots or backing-file relationships that are not always carried over exactly as-is. If the source image is part of a snapshot chain, make sure you convert the correct active image. For best results, shut down the virtual machine before converting and keep a backup of the original file.
Note: This qcow to vhdx conversion record is incomplete, must be verified, and may contain inaccuracies. Please vote below whether you found this information helpful or not.
QCOW vs VHDX: format comparison
How the QCOW and VHDX formats compare on the properties that matter most for this conversion.
| Property | .QCOW QEMU Copy On Write image | .VHDX Hyper-V Virtual Hard Disk v2 |
|---|---|---|
| Compression | Both | Both |
| Encryption | Yes | Yes |
| Split archives | No | No |
| Bootable | Yes | Yes |
| Operating system support | Wide | Wide |
| Typical file size | Small | Large |
| Open standard | Yes | Partly open |
| Introduced | 2004 | 2012 |
| Developer | QEMU community / Fabrice Bellard | Microsoft |
Frequently asked questions
Is the QCOW to VHDX converter free?
Yes, converting QCOW to VHDX on 101convert.com is completely free. No registration, email address or installation is required.
How large can my QCOW file be?
You can upload QCOW files up to 2000 MB and convert up to 1 files at once in a single batch.
What happens to my uploaded files?
Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.
Do I need to install any software to convert QCOW to VHDX?
No. The QCOW to VHDX conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.
Did the conversion fail?
In most cases, the cause is an incorrect file format. Please upload a valid QCOW file for this QCOW to VHDX conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.