Convert VMware to VirtualBox: Full Guide

To convert a VMware virtual machine to VirtualBox, you export it as an OVF/OVA file and import it into VirtualBox, or you convert the virtual disk directly using the VBoxManage clonehd command. This guide covers both methods, explains the differences between them, and walks through the steps so you can move your VM without reinstalling the operating system.

Why Convert Between VMware and VirtualBox?

VMware and VirtualBox are two of the most popular desktop virtualization platforms. VMware Workstation and VMware Player are commercial products with a free tier, while VirtualBox is open-source and free. Users often switch to VirtualBox to avoid licensing costs, to standardize on a single tool, or because they prefer its integration with certain host operating systems. Converting a VM lets you keep your existing operating system, installed applications, and data instead of building a new virtual machine from scratch.

What Actually Needs to Be Converted?

A virtual machine consists of two main parts: the configuration (hardware settings like RAM, CPU, network adapters) and the virtual disk (the file that contains the guest OS and all files). The configuration is stored in a small file with a .vmx extension in VMware. The virtual disk usually has a .vmdk extension. VirtualBox uses .vbox files for configuration and supports its own disk formats (.vdi, .vmdk, .vhd, etc.).

When you convert, you need to translate both the hardware settings and the disk format. The good news: VirtualBox can read VMware’s .vmdk files directly in many cases, so a full conversion is not always necessary. However, for a clean migration you will often want to convert the disk to .vdi to avoid subtle compatibility issues.

Method 1: Export as OVF/OVA and Import

The most reliable way to convert a VMware VM is to use the OVF (Open Virtualization Format) standard, which both VMware and VirtualBox support. Here is the step-by-step process:

1. In VMware: Open the VM in VMware Workstation or Player. Go to File → Export to OVF (or Export to OVA). Choose a destination folder and wait for the export to finish. This creates a single .ova file (or a folder with .ovf and .vmdk files).
2. In VirtualBox: Open VirtualBox and go to File → Import Appliance. Browse to the .ova file you just exported. VirtualBox will show you the VM settings from the OVF; you can adjust them (like RAM or CPU count) before importing.
3. Click Import and wait. VirtualBox will create a new VM with its own copy of the disk.

This method is the safest because it preserves the virtual hardware configuration and avoids most compatibility issues. It works for VMware Workstation, VMware Player, and even VMware ESXi (via the vSphere Client’s export function).

Method 2: Convert the Disk with VBoxManage

If you already have a VMware VM and want to use its existing .vmdk file directly, you can convert it to VirtualBox’s native .vdi format using the command-line tool VBoxManage. This is useful when you want to keep the VM’s current state without exporting/importing the whole appliance.

1. Open a terminal (or Command Prompt in Windows) and navigate to the folder containing your .vmdk file.
2. Run: VBoxManage clonehd source.vmdk target.vdi --format VDI
3. If your VM has multiple disks, repeat for each one.
4. In VirtualBox, create a new VM and when asked for a disk, choose Use an existing virtual hard disk file and select the new .vdi.

Note: VBoxManage clonehd works with .vmdk files that are not already in use by a running VM. If the VM is suspended, you may need to resume it and shut it down cleanly first. Also, the command copies the disk, so you will have both the original and the converted file—make sure you have enough free space.

How to Choose the Right Method

Both methods work, but they have different trade-offs:

• OVF/OVA export/import is more user-friendly, especially for beginners, because it handles the configuration automatically. It also compresses the disk (OVA is a tar archive) which can reduce file size, but it takes longer for large disks.
• VBoxManage clonehd is faster for simple disk conversions and gives you more control (e.g., you can choose a different disk format or resize the disk during cloning). However, you must manually set up the VM’s hardware settings in VirtualBox.

If you are moving a VM that has snapshots, the OVF export will only include the current state (snapshots are flattened). The clonehd command also copies only the current state by default. If you need to preserve snapshots, you would need to use a different tool or convert each snapshot separately, which is complex and rarely necessary.

Common Problems and How to Fix Them

After conversion, you might encounter a few issues:

• Guest OS won’t boot: This often happens because the disk controller type changed. VMware uses SCSI (LSI Logic) or SATA by default; VirtualBox may default to IDE. In VirtualBox, go to the VM’s Settings → Storage, and change the controller type to match what the guest expects (e.g., SATA or SCSI). If the OS still won’t boot, try adding a different controller type.
• Network adapter not recognized: The guest may have drivers for an Intel PRO/1000 or AMD PCNet adapter, but VirtualBox defaults to its own virtual NIC. Change the adapter type in Settings → Network to one that the guest OS has drivers for (e.g., Intel PRO/1000 MT Desktop).
• Missing VMware Tools: VMware Tools (or open-vm-tools) are installed in the guest for better performance and integration. After conversion, you should install VirtualBox Guest Additions to get similar features like seamless mouse integration and shared folders. To do this, start the VM and use the VirtualBox menu Devices → Insert Guest Additions CD image.
• Activation issues: Windows may require reactivation after a hardware change. This is normal; you will need to reactivate Windows over the internet or by phone. This is not a problem with the conversion itself, but a licensing requirement.

Cost and Licensing Considerations

VirtualBox is free and open-source under GPLv2, so there is no cost to use it for personal or even commercial purposes (with some restrictions if you use the extension pack, which has its own license). VMware Workstation Player is free for personal use, but commercial use requires a paid license. Converting to VirtualBox can eliminate licensing costs, but you should review the license terms of the guest OS you are running—moving a VM to new hardware may affect your Windows license, for example.

Frequently Asked Questions

Can I just open a .vmdk file directly in VirtualBox?

Yes, VirtualBox can use VMDK files directly without conversion. When creating a new VM, choose “Use an existing virtual hard disk file� and select the .vmdk. However, it is often better to convert to VDI for better performance and to avoid potential compatibility issues with snapshots or certain features.

Will my installed programs and files remain after conversion?

Yes, because the virtual disk is copied as-is. All your files, installed applications, and settings are preserved. The conversion only changes the container format, not the data inside.

Do I need to reinstall the operating system after converting?

No, that is the whole point of conversion. You keep the existing OS installation. You may need to adjust drivers for virtual hardware (like the network adapter) but you do not need to reinstall.

What if my VM has snapshots in VMware?

The OVF export and the clonehd command both flatten the snapshots, meaning they only copy the current state of the disk. If you need the snapshots themselves, you would have to use a different tool or manually export each snapshot, which is complicated. In most cases, you can just create new snapshots in VirtualBox after conversion.

Is there a way to convert from VirtualBox to VMware?

Yes, the process is symmetrical. You can export a VirtualBox VM as OVF and import it into VMware, or use VMware’s vCenter Converter tool. The same principles apply: use OVF/OVA for a full migration, or convert the disk format (VDI to VMDK) using VBoxManage.

Why does my converted VM run slower than before?

This can happen if the guest OS is using generic drivers instead of the optimized ones for the new virtual hardware. Installing VirtualBox Guest Additions should improve performance. Also check that you have allocated enough RAM and CPU cores to the VM in VirtualBox settings.

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