How to Make a VirtualBox Windows VM Fullscreen | Guest Additions Fix
If your VirtualBox virtual machine does not resize or go fullscreen, the solution is simple: install VirtualBox Guest Additions.
In this video I show step-by-step how to install Guest Additions inside a Windows virtual machine so it can automatically resize and run in fullscreen mode.
After installing Guest Additions you will be able to:
• Enable fullscreen mode
• Automatically resize the VM window
• Improve graphics performance
• Enable better mouse integration
• Improve overall VM usability
This is essential if you're building a lab environment, running cybersecurity tools, or learning virtualization.
This tutorial works for:
• Windows 10 VirtualBox VMs
• Windows 11 VirtualBox VMs
• Windows Server virtual machines
• Most Linux hosts running VirtualBox
Steps covered in the video:
Insert Guest Additions CD Image
Install VirtualBox Guest Additions
Restart the virtual machine
Enable fullscreen and auto-resize mode
If you're building a virtualization lab or learning cybersecurity environments, this fix is essential for working comfortably inside your virtual machines.