How to change the Windows screen size in VirtualBox?

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Oracle's VirtualBox virtualization software is a popular choice for users who want to test new operating system versions. If you install Windows in VirtualBox, you may notice that you can't change the default screen resolution of 1024x768.



The low resolution may be sufficient for some tasks, but many may benefit from larger resolutions. The View > Virtual Screen menu of the VirtualBox application lists all available resolutions and scaling options.

The "resize to" options are all inactive, as they are grayed out and not selectable. The scaling options are unlocked and available, though.

Thankfully, it is rather easy to unlock all supported screen resolutions in VirtualBox. The following instructions explain in detail how that is done.

Fixing the Screen Size of Windows in VirtualBox



The fix requires the installation of Guest Additions; this may sound intimidating at first, but it is a straightforward process that completes in a matter of minutes on most systems. The description may sound as if you'd need to insert a CD image, but this is not the case. VirtualBox mounts a virtual CD image when the option is selected.

To get started, select Devices > Insert Guest Additions CD image. All that it does is mount the Guest Additions CD in VirtualBox, so that you may access its contents. You will hear a sound that indicates that the CD has been mounted.

Next, open File Explorer on the system and open the the CD drive "Virtual Guest Additions".



The root menu lists three guest additions for Windows. There are also additions for other operating systems, including Linux and Solaris.

The three Windows guest additions are for different architectures.

• VBoxWindowsAdditions is an automatic selector. Pick this one.
  
• VboxWindowsAdditions-amd64 is 64-bit systems.
  
• VboxWindowsAdditions-x86 is for 32-bit systems.
  

Right-click on one of the files and select open from the context menu to start the installation in the virtual machine. You may double-click on the file to start the installation.

Windows displays a User Account Control prompt, which you need to allow by selecting Yes.



The installer launches after you have selected Yes. Select next on the first page that is displayed.



The page that follows displays the destination folder for the files that will be installed. You may change it, but most users may want to keep the default path. Select Next to proceed.



The final screen displays the components that will be installed. You may disable the creation of a start menu entry, but the two remaining components will be installed. Select the install button to proceed.



The installer displays its actions once you hit the install button.

It is necessary to reboot the virtual machine to finalize the installation. You may do so right away by selecting "reboot now", or at a later point in time. Select finish to exit the installer.



All screen resolutions are unlocked after the restart. Select View > Virtual Screen X to select a different resolution. Please note that it may take a few seconds before the resolutions become available.



The physical display limits the available resolution; you can't go beyond the maximum resolution that is supported by the display.
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