How to Use a Laptop as a Second Monitor in Windows

If you have an extra laptop lying around, you might consider turning it into a second monitor for your primary device. This is a convenient solution, especially if you work with multiple windows or enjoy watching videos while tackling tasks on your main screen. Windows offers several simple ways to set this up, helping you expand your workspace without extra costs.

Method 1: Using Windows' Built-In Feature - Miracast

Windows 10 and Windows 11 support Miracast, a wireless display technology that allows devices to connect to each other. Here’s how to set it up:

  1. On your primary PC: Go to Settings → System → Projecting to this PC. Under Projecting to this PC, select Available everywhere or Available everywhere on secure networks.
  2. On your laptop: Press Windows + P and choose Connect to a wireless display.
  3. Select your laptop from the list, and your main screen will start projecting onto it.

This feature allows you to either duplicate or extend your screen, using the laptop as an additional display.

Method 2: Using the SpaceDesk Application

If Miracast isn’t supported or doesn’t work well, you can use the free SpaceDesk software, which turns your laptop into an extra monitor over Wi-Fi.

  1. Download and install the SpaceDesk server application on your primary PC.
  2. Install the SpaceDesk client app on your laptop.
  3. Run both apps and follow the instructions to connect the devices over the local network.

SpaceDesk allows for both screen extension and mirroring, giving you flexible display options.

Method 3: Using Deskreen

Another option is Deskreen (deskreen.com), which lets you use your laptop as a second monitor via a browser. This works well if you have a stable Wi-Fi connection.

  1. Download Deskreen on your main PC.
  2. Launch the app, then either scan the QR code with your laptop or open the given link in a browser on the laptop.
  3. The connection will start automatically, and you can set up the screen as an extension or a mirror.

Method 4: Connecting with an HDMI Cable

If both your laptop and main computer have HDMI input and output ports, you can use an HDMI cable. However, this requires specific software since Windows doesn’t support HDMI for direct laptop-to-laptop display sharing. Popular software options include MaxiVista and ZoneOS.