Free online VHDX to VDI converter

Source format: VHDX

VHDX is Microsoft’s newer virtual hard disk format, used mainly by Hyper-V on Windows. It stores the contents of a virtual machine’s disk, including the operating system, applications, and data. Compared with older VHD files, VHDX supports larger capacities, better resilience against corruption, and improved performance for modern virtualized workloads. It is commonly used for Windows Server, Windows client virtualization, testing environments, and enterprise VM deployments.

Target format: VDI

VDI is the virtual disk format used by Oracle VM VirtualBox. It is a native VirtualBox disk image that works well for desktop virtualization, development, testing, and running guest operating systems on Windows, macOS, and Linux. A VDI file is convenient when you want to move a VM from Hyper-V into VirtualBox or standardize your virtual disks around VirtualBox’s ecosystem. Its main advantage is broad compatibility within VirtualBox and straightforward management of dynamically allocated or fixed-size disks.

How to perform the conversion

The most reliable method is to use VirtualBox or qemu-img. If you already use VirtualBox, the built-in VBoxManage tool is usually the simplest choice. You can also convert the file on 101convert.com for free, without installing any software.

Method 1: VirtualBox command line

1. Install Oracle VM VirtualBox on your computer.
2. Open a terminal or command prompt.
3. Run a conversion command such as VBoxManage clonemedium disk source.vhdx output.vdi --format VDI.
4. Wait for the process to finish. The new output.vdi file will be created in the location you specified.
5. Attach the VDI file to a VirtualBox virtual machine through the VirtualBox Manager.

Method 2: qemu-img

1. Install QEMU tools, which include qemu-img.
2. Use a command like qemu-img convert -f vhdx -O vdi source.vhdx output.vdi.
3. Verify that the resulting VDI opens correctly in VirtualBox.

Method 3: VirtualBox graphical workflow

1. Open VirtualBox Manager.
2. Go to Tools → Media or the storage/media management area.
3. Choose the option to add or convert a disk image, then select the VHDX source.
4. Export or clone it as VDI, then attach the result to your VM.

Notes on quality, compatibility, or limitations

VHDX-to-VDI conversion is a disk-image conversion, not a full virtual machine migration. The virtual disk data is copied or translated, but the VM configuration, firmware settings, virtual hardware, and integration tools are not automatically preserved. After conversion, you may need to create a new VirtualBox VM and manually set CPU, RAM, network, and storage controller options.

Compatibility depends on the guest operating system and how the original VHDX was created. If the source disk uses features specific to Hyper-V, such as certain partition layouts or boot settings, the guest may need repair or reconfiguration before it boots in VirtualBox. For best results, shut down the VM cleanly before converting, and avoid converting a disk that is still in use.

Performance and size can also change. A dynamically allocated VHDX may become a differently sized VDI depending on the conversion tool and options used. If the source disk is large, the conversion can take some time and require enough free storage for both the source and the new image.