How to Use a Laptop as a Monitor: A Step-by-Step Guide 2025

In today’s tech-driven world, maximizing your devices can save time, money, and space. Ever wondered if your laptop could double as a monitor for a desktop PC, gaming console, or another laptop? It’s possible! Whether you’re a gamer needing an extra screen, a professional building a dual-monitor setup, or just have a spare laptop, this guide will show you how to make it happen. We’ll explore methods, tools, and tips to set it up seamlessly. Let’s get started!

Why Use a Laptop as a Monitor?

Before we get into the how-to, let’s talk about why you might want to do this. Laptops are portable, equipped with decent displays, and often underutilized when not in primary use. Using your laptop as a secondary monitor can boost productivity by giving you more screen real estate for multitasking—think coding on one screen while referencing documentation on another. Gamers can use it to extend their gaming setup, and creative professionals might appreciate the extra space for editing software. Plus, it’s a cost-effective alternative to buying a standalone monitor. Ready to unlock this potential? Here’s how to do it.

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Method 1: Using Built-In Software (Windows and macOS)

The easiest way to use your laptop as a monitor is by leveraging features already built into your operating system. Both Windows and macOS offer tools to extend or mirror displays, but this typically works best when connecting two computers (like a desktop and a laptop).

For Windows: Use the “Project” Feature

1. Check Compatibility: Ensure both your primary device (e.g., a desktop PC) and your laptop are running Windows 10 or 11. They’ll need to be on the same Wi-Fi network.
2. Enable Wireless Display: On your laptop (the one you want as a monitor), press Windows + P to open the Project menu. Select “Connect to a wireless display.”
3. Connect from Your Main Device: On your primary PC, go to Settings > System > Display > Connect to a wireless display. Your laptop’s name should appear—click it to connect.
4. Adjust Settings: Once connected, you can choose to extend or duplicate the screen. Head to Display Settings to arrange the screens as needed.

For macOS: Use Screen Sharing

1. Enable Screen Sharing: On your laptop (the secondary device), go to System Preferences > Sharing and turn on “Screen Sharing.”
2. Connect from Your Main Mac: On your primary Mac, open Finder, locate your laptop under “Locations,” and click “Share Screen.” Enter credentials if prompted.
3. Use as a Monitor: The laptop’s screen will mirror or extend your main device’s display, depending on your Display settings.

This method is wireless and convenient but may have slight latency, so it’s best for casual use rather than gaming or high-performance tasks.

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Method 2: Using HDMI or VGA Input (Hardware Solution)

If your laptop has an HDMI or VGA input port, you can connect it directly to another device, like a gaming console or PC, to use it as a monitor. However, most laptops only have output ports (e.g., HDMI-out), not input. Here’s what to do:

1. Check Your Laptop’s Ports: Look at your laptop’s specifications. If it has an HDMI-in or VGA-in port (rare on modern laptops), you’re in luck.
2. Connect the Devices: Use an HDMI or VGA cable to connect your primary device’s output (e.g., a PC or PlayStation) to your laptop’s input port.
3. Switch to Input Mode: Some laptops with input ports have a hotkey (like Fn + F8) or a specific app to switch the display to “input mode.” Check your manual for details.

Unfortunately, this method is uncommon because most laptops aren’t designed to receive video input. If your laptop lacks an input port, don’t worry—software solutions are more accessible and versatile.

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Method 3: Third-Party Software Solutions

For the most reliable and flexible way to use your laptop as a monitor, third-party apps are your best bet. These tools let you extend or mirror your screen over a wired or wireless connection. Here are two popular options:

Option 1: Duet Display

• What It Is: Originally designed for iPads, Duet Display now supports laptops as secondary monitors for PCs and Macs.
• Steps:
  
  1. Download and install Duet Display on both your primary device and your laptop.
  2. Connect the devices via USB-C or Lightning cable (wired is faster, but wireless is an option).
  3. Open the app on both devices and follow the prompts to link them.
  4. Configure your display settings to extend or mirror the screen.
• Pros: Low latency, great for professionals and creatives.
• Cons: Paid app (one-time purchase).

Option 2: Spacedesk

• What It Is: A free tool that turns your laptop into a monitor over Wi-Fi or USB.
• Steps:
  
  1. Install the Spacedesk server software on your primary PC and the viewer app on your laptop.
  2. Ensure both devices are on the same network.
  3. Launch the server on your PC, then open the viewer on your laptop—it should detect the PC automatically.
  4. Adjust your display settings to extend your desktop.
• Pros: Free and easy to set up.
• Cons: Wireless connections may lag slightly.

These apps are SEO gold because they’re searchable terms people use when looking for monitor solutions—think “best apps to use laptop as monitor.”

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Tips for Optimal Performance

• Stable Connection: For wireless setups, ensure a strong Wi-Fi signal. Wired connections (USB or HDMI) reduce lag.
• Resolution Matching: Adjust both devices’ resolutions to avoid scaling issues.
• Update Drivers: Keep graphics drivers updated on both devices for smooth performance.
• Power Settings: Plug in your laptop to avoid battery drain during extended use.

Conclusion

Turning your laptop into a monitor is a cost-effective way to boost your setup for work, gaming, or creativity. Options range from built-in OS tools to apps like Duet Display and Spacedesk, with software being the most accessible solution. With a quick setup, you’ll enjoy a dual-screen experience. Dust off that old laptop—your productivity and gaming might improve! Tried it yet? Share your favorite method below!