[Boost Your Productivity: Guide to Extending a Laptop into a Secondary Monitor]
Adding a second screen to your laptop can dramatically boost your productivity. Mirroring the desktop shows the same workspace on both monitors—ideal for presentations—while extending provides a wider canvas for multitasking and more visible tabs. You don’t need to purchase expensive hardware; if you have an extra laptop, a few simple configuration steps let you create a seamless dual‑monitor setup.
Andrey_Popov/Shutterstock
For Windows 10 or 11 users, leveraging native wireless casting simplifies the setup. Both devices run Miracast, a Wi‑Fi‑based protocol that creates an instant, low‑latency link for screen sharing. Open Settings, navigate to System → Projecting to this PC, and enable the optional Wireless Display option. Select your laptop from the list and confirm that you want to mirror or extend the display.
How to use a Windows laptop as a second monitor
If both your primary computer and the spare laptop you want to use as a second monitor are running Windows 10 or 11, extending or mirroring them is quite simple due to the operating systems’ built-in wireless casting tools. These rely on Miracast, a Wi‑Fi‑based functionality that enables connections between devices and requires only a quick workflow to set up.
First, verify compatibility between your main computer and spare laptop. Choose between wireless methods like Miracast for Wi‑Fi connections or use a physical HDMI link for lower latency. Adjust system settings to enable display extension or mirroring, then follow platform‑specific instructions to connect.
Activating the feature begins on the spare laptop: launch Settings, go to System, then Projecting to this PC. Enable Optional features, navigate to View features, and select Wireless Display. After installation, enable ‘Available everywhere’ and open the Wireless Display app to pair the devices.
Connect your spare display to your primary workstation by triggering the Windows key + K shortcut, selecting the laptop from the available list, and authenticating with its PIN. Choose between duplicating or extending the desk, and use the Windows key + P to toggle the arrangement. Note that this wireless approach relies on network connectivity and incurs latency, making it ideal for multitasking but less suited for fast‑paced gaming.
Can I use other operating systems as a second monitor?
Apple users can link MacBooks using AirPlay, provided the secondary device is a 2018‑model or newer. Enable AirDrop & Continuity in System Settings under General, turn on AirPlay Receiver, and choose Current User for the allowances list. Ensure both machines are signed into the same Apple ID for a smooth session. On the main Mac, open System Settings, select Displays, and add the second monitor by clicking the plus icon. Choose between mirroring or an extended layout for a more spacious workflow.
Can I use an HDMI cable to connect my devices?
Linking cross‑platform systems such as Windows and macOS—or any Linux environment—requires an open‑source tool like Deskreen, which operates over Wi‑Fi. First, confirm both devices share the same network, then install Deskreen on the primary machine. The software will present a QR code and link; scanning this on the spare laptop initiates the connection. Deskreen mirrors the display out of the box, but for an expanded workspace you need a virtual display adapter or a dummy plug attached to the host PC’s HDMI port. Keep in mind that any Wi‑Fi connection will introduce minor latency, so wired HDMI may be better for gaming or latency‑sensitive work.