After major updates, compact the QCOW2:
qemu-img convert -O qcow2 Windows10.qcow2 Windows10-compacted.qcow2
Recommendation: For legal and security reasons, avoid random QCOW2 files from untrusted websites. Use the official ISO + self-install method.
Creating a fresh, pre-installed Windows 10 QCOW2 file (a virtual disk image used by QEMU/KVM) is a great way to save time during virtual machine setup.
Since Microsoft does not provide official QCOW2 downloads, you generally have two options: downloading a community-created image or creating your own using an automated tool.
Here is a guide on how to handle Windows 10 QCOW2 files.
Getting a Windows 10 QCOW2 file is a top priority for developers and IT pros using QEMU, KVM, or OpenStack. While Microsoft primarily distributes Windows in ISO or VHDX formats, you can easily obtain or create a QCOW2 image to take advantage of features like snapshots, thin provisioning, and compression. Official Sources for Windows 10
Microsoft does not provide a direct download link for QCOW2 files. Instead, you must download the official installation media and convert it.
Standard ISO: Use the Microsoft Windows 10 Download Page to get the latest ISO using the Media Creation Tool. windows 10 qcow2 file upd download
Evaluation VMs: For testing, Microsoft offers 90-day evaluation versions of Windows 10 Enterprise. These are typically available as VMware or Hyper-V virtual machines which can then be converted.
Enterprise & Insider Builds: Authorized users can access Enterprise editions or Insider Preview builds via their respective portals. How to Create a Windows 10 QCOW2 File
The most reliable way to get a "clean" QCOW2 image is to build it yourself using the qemu-img tool. 1. Convert an Existing Disk Image
If you already have a Windows 10 virtual disk in another format (like .vhdx or .vmdk), use the following command to convert it to QCOW2:
qemu-img convert -f vmdk -O qcow2 windows10.vmdk windows10.qcow2 Use code with caution.
This process can significantly reduce file size—sometimes by over 35%—due to QCOW2's efficient storage handling. 2. Install Directly to QCOW2
For the best performance in KVM/QEMU, create an empty QCOW2 disk and install Windows 10 from an ISO: After major updates, compact the QCOW2: qemu-img convert
Microsoft does not provide a direct download for Windows 10 in the .qcow2 format; however, you can create one by downloading the official Windows 10 ISO and converting it using virtualization tools like QEMU. 1. Obtain the Official Windows 10 ISO
Since Windows 10 support officially ended on October 14, 2025, it is recommended to secure a copy of the final version (22H2) before Microsoft removes the direct download options.
Media Creation Tool: The standard way to get an ISO is through the Windows 10 Media Creation Tool. Select "Create installation media (ISO file)" when prompted.
UUP Dump: For specific builds or updated images that include the latest security patches, tools like UUP Dump allow you to download files directly from Microsoft servers to build a customized ISO. 2. Convert to QCOW2 Format
The .qcow2 (QEMU Copy-On-Write) format is primarily used with Linux-based hypervisors like KVM/QEMU or Proxmox.
Creating a New Image: Use the qemu-img command to create a virtual disk of a specific size (e.g., 50GB is recommended for a basic install):qemu-img create -f qcow2 windows10.qcow2 50G
Installing from ISO: Once the disk is created, you must "install" Windows onto this disk by booting your virtual machine using the ISO file you downloaded. Recommendation: For legal and security reasons, avoid random
VirtIO Drivers: For optimal performance in a QCOW2 environment, ensure you use VirtIO drivers during the installation process to allow Windows to recognize the virtualized hardware efficiently. 3. Updating an Existing Image Using Windows 10? Do THIS Now Before It's Too Late!
qemu-img convert -O qcow2 -c windows10.qcow2 windows10-compacted.qcow2
Whether you download a ready-made Windows 10 QCOW2 or build and update your own, the key is keeping it current. Old Windows 10 images are vulnerable to security risks and driver issues. Bookmark a trusted source like Cloudbase Solutions or create a monthly update routine using QEMU command-line tools.
Now go virtualize Windows 10 the smart way – with lean, updated QCOW2 files.
Have a reliable source for Windows QCOW2 files? Share it in the comments below to help the community stay safe and up to date.
Creating a feature for downloading Windows 10 as a qcow2 file involves several steps, including setting up a server to host the file, creating a downloader application, and ensuring legal compliance. However, I'll provide a general outline of how you could approach this, focusing on the technical aspects.
Important Legal Consideration: Before proceeding, ensure you have the right to distribute or download Windows 10. Microsoft's Windows 10 images are copyrighted and typically require a valid license for legal use. This example assumes you are legally entitled to download and distribute Windows 10.
| Your situation | Best action | |----------------|--------------| | Quick test, don’t care about latest updates | Download Cloudbase QCOW2 | | Production VM, need security patches | Build your own from ISO + Windows Update | | Limited bandwidth | Download pre-built once, then update inside VM |
🧠 Pro tip: Store your clean, updated QCOW2 file on an external SSD or NAS. Then use
qemu-img snapshotto create disposable child images for testing. This saves hours of reinstallation.