Step-by-step Guide: How to Use a Second Laptop as a Monitor

Using a second laptop as a monitor is a clever way to expand your digital workspace, boost productivity, or make multitasking more manageable. Whether you're setting up for remote work or casual gaming, this guide takes you through everything you need to know about using a laptop as a monitor — from the necessary equipment to a straightforward, step-by-step setup. We’ll also cover common issues and provide practical troubleshooting advice to ensure a seamless experience.

Preparations for Using Another Laptop as a Second Monitor (via Cables)

Before diving into the step-by-step process, let’s answer a common question: “Can I use my laptop as a monitor?” The answer is yes — with the appropriate equipment, it’s absolutely possible. Here’s what you’ll need to prepare to connect two laptops using cables:

Video Capture Device

A video capture device is crucial when setting up one laptop to serve as a second monitor. This device links your primary laptop to the secondary one, allowing video signals to be transmitted from the source laptop to the display.

There’s a wide selection of video capture devices available on the market. Look for one that is HDMI-compatible to ensure it works with most laptops. For optimal performance, choose a device with low latency to minimise visual delays, and ensure it supports the resolution you require for sharp image quality.

HDMI Cables

An HDMI cable is essential for connecting your primary laptop to the capture device. HDMI cables vary in length and type, so pick one that best suits your setup. High-speed HDMI cables are recommended to maintain excellent video quality and reduce lag.

To use a laptop as a second monitor via HDMI, your main laptop must have an HDMI output port to connect to the video capture device. Your secondary laptop will require an HDMI input port to receive the video feed from the capture device.

HDMI Adapters (If Required)

In cases where one or both laptops lack the necessary HDMI ports, HDMI adapters are vital. These adapters enable proper connection between the primary laptop and the video capture device. Common types include DisplayPort to HDMI and USB to HDMI converters.

Identify the available ports on both laptops and select adapters accordingly, ensuring compatibility with each device’s connectivity options. The right adapter will enable a smooth connection and allow the secondary laptop to function as an effective display.

If you’re in the market for HDMI adapters, there are plenty of reliable options available, such as the impressive Anker 518 USB-C Adapter (8K HDMI). Enjoy ultra-clear visuals with resolutions up to 8K at 60Hz or 4K at 144Hz. This high-definition adapter easily transforms a USB-C port into an HDMI connection. With plug-and-play convenience, it’s ideal for connecting laptops to monitors, projectors, or TVs.

Lastly, verify that both laptops are running compatible operating systems — ideally Windows 10 or Windows 11 — as these versions offer robust support for features like Project to This PC and Miracast. These tools make the setup process far more seamless and user-friendly.

How to Use a Second Laptop as a Monitor: Step-by-Step

Easily extend your digital workspace by following these straightforward steps to use a laptop as a secondary display:

Check Compatibility and Requirements

Before you begin connecting two laptops for display sharing, it’s essential to verify that your main laptop supports output to an additional screen. Confirm that it has the appropriate ports (such as HDMI, VGA, or DisplayPort) and that the second laptop is capable of accepting video input — which is less common but may be possible with certain software solutions. Be sure to also check operating system compatibility, as some features are only available on specific versions of Windows or MacOS.

Connect Cables or Adapters to the Video Capture Device

If you're using a hardware solution like a video capture card, the next step involves connecting the required cables between your laptops and the capture device. You may need to use adapters to match the ports available on your devices. For example, if your capture card connects via USB and your primary laptop only has an HDMI output, you'll need an HDMI to USB adapter. Double-check that all cables are properly and securely connected.

Connect the Video Capture Device to the Laptop

Now, connect the video capture device to your main laptop — the one whose screen will be mirrored or extended onto the second device. Ensure the connection is secure. Most capture cards display an LED or message to confirm that the signal is active. Install any required drivers for the capture device, which are typically available on the manufacturer’s website. Once everything is installed, you're ready to extend your display to the second laptop.

Optimise the Monitor Performance

Finally, adjust your settings to ensure the best visual output. In your system settings or graphics control panel, fine-tune the resolution, screen orientation, and refresh rate to suit the secondary laptop. If you're using software, optimise settings like encoding quality based on your hardware performance and internet speed. And remember — always keep your secondary laptop plugged into a power outlet to avoid any unexpected shutdowns during use.

Common Issues During the Connection Procedure

When setting up a laptop screen as a second monitor, whether through hardware connections, networks, or services, a few common problems may arise. Below are some of the most frequent issues along with their suggested solutions:

Incompatible Hardware: One of the laptops might not have the necessary ports or capabilities to function as an external monitor. Before attempting the setup, confirm that both laptops have the required hardware compatibility.

Incorrect Cable or Adapter: Using an unsuitable cable or adapter can disrupt or prevent the connection. Be sure to use the correct cables and adapters that match the specific video input/output ports available on both devices.

Software Issues: At times, software-related problems can interfere with the display on either laptop. Make sure that your video capture device’s software is current and compatible with the operating systems and hardware on both machines.

Poor Display Quality: If the visual output from the main laptop appears blurry, distorted, or delayed on the secondary one, adjust the display resolution and performance settings on both laptops as well as the capture device to improve image quality.

Conclusion

In conclusion, learning how to use a laptop as a monitor opens up numerous opportunities, transforming your setup into a highly productive workspace. With the proper preparation and a clear understanding of the steps, cables, and troubleshooting methods, you’ll quickly appreciate the practicality and flexibility of a dual-screen arrangement. Don’t leave that spare laptop unused—take advantage of its potential to build the ultimate multitasking environment that truly elevates your digital experience.

FAQs

Can I extend the display to a third laptop using the same cable setup?

Extending your display to a third laptop is more complicated and typically cannot be done using just a standard USB-C cable. This would require advanced equipment, such as a docking station, or software options like remote desktop applications to share displays across three devices.

What precautions should I take when disconnecting the cable from the laptops?

Before disconnecting any cables, ensure all data transfers have been completed to avoid potential data loss or file corruption. It’s also recommended to safely eject any connected devices through your laptop’s operating system. When unplugging a USB-C cable, grip the plug rather than the cord to prevent damaging the cable.

Can I use a laptop as a monitor for Xbox?

Yes, you can use a laptop as a monitor for Xbox, either by connecting them using an HDMI cable or by streaming wirelessly. For the HDMI method, your laptop must have an HDMI input port—something that’s not commonly found. Alternatively, you can wirelessly stream your Xbox gameplay to a laptop using apps like Xbox Console Companion on Windows 10 or the Xbox App on Windows 11.

How can I use my laptop as a monitor only?

To use your laptop purely as a monitor, you can connect wirelessly using built-in features such as Miracast or the “Project to This PC” option available on Windows 10 and 11. These allow you to mirror or extend your screen from another device without needing any external cables. MacOS users can achieve similar functionality using the AirPlay feature.