You can use your laptop screen as a monitor for another computer, but the method depends on your hardware and what you want to display

A laptop can act as a second monitor for a desktop, but not in the way a traditional monitor does. Your laptop cannot straightforward receive a video signal from another computer through its built-in ports. Instead, you need software that streams the desktop image from your main computer to your laptop over your network or a direct connection. This works best when your laptop and desktop are on the same Wi-Fi network or connected by USB cable, and the setup takes 10 to 15 minutes.

The most common approach uses either remote desktop software (which shows your main computer's screen on the laptop) or display extension software (which treats the laptop as a wireless second monitor). The choice depends on whether you want to control both computers separately or extend your main computer's workspace onto the laptop screen.

Key Takeaways

  • Your laptop cannot receive video input directly — you need software to stream the desktop image over Wi-Fi or USB instead.
  • Remote desktop software like Microsoft Remote Desktop or Chrome Remote Desktop shows your main computer's screen on the laptop, but you control only one computer at a time.
  • Display extension software like Spacedesk or Luna Display treats the laptop as a wireless second monitor and lets you drag windows between screens.
  • Both methods work best when your laptop and desktop are on the same network, and performance depends on your Wi-Fi speed and the distance between devices.
  • USB-connected solutions are faster and more reliable than Wi-Fi but limit how far apart the computers can be.

Remote Desktop Software vs. Display Extension Software

The two main approaches solve different problems. Remote desktop software lets you see and control your main computer from your laptop, but you are viewing the entire desktop of one machine on another. You cannot use both computers at the same time — when you are looking at your main computer on the laptop screen, the main computer's own monitor goes unused. This is useful if you want to work from your laptop while your desktop is in another room, or if you want to access your desktop from the couch.

Display extension software treats your laptop as a true second monitor. Your main computer's desktop extends onto the laptop screen, and you can drag windows between them. Both computers remain active, and you can use the laptop for other tasks while the extended display shows your main computer's workspace. This is the better choice if you want more screen space for a single computer.

Remote desktop is built into Windows (Remote Desktop Connection) and macOS (Screen Sharing), so you may not need to install anything. Display extension usually requires paid software like Spacedesk (Windows and Android) or Luna Display (Mac and iPad), though some free options exist with limitations.

Setting Up Remote Desktop on Windows

Windows Remote Desktop is built into Windows Pro, Enterprise, and Education editions — not Home. On your main desktop computer, open Settings, go to System, then Remote Desktop, and toggle it on. Write down your computer's name (shown in Settings under System, About) or its IP address (find this by opening Command Prompt and typing ipconfig, then looking for "IPv4 Address").

On your laptop, open the Remote Desktop Connection app (search for "Remote Desktop" in the Start menu). Type your desktop computer's name or IP address into the box, click Connect, and enter your Windows password when prompted. Your laptop will then display your desktop computer's screen. You can resize the window or go full-screen. To return to your laptop's own desktop, press Ctrl+Alt+Home or click the X button.

Both computers must be on the same network, and your desktop computer must be powered on and not locked. If you are connecting over the internet from outside your home, you will need to set up port forwarding on your router, which is more complex and beyond this guide.

Using Chrome Remote Desktop for Any Operating System

Chrome Remote Desktop works on Windows, Mac, and Linux, and it is simpler to set up than Windows Remote Desktop because it does not require the same network. On your main computer, open Chrome, go to remotedesktop.google.com, and click Set Up Remote Access. Install the Chrome Remote Desktop extension, then follow the prompts to name your computer and create a PIN. Your computer will now appear in your list of remote devices.

On your laptop, go to the same website (remotedesktop.google.com), sign in with the same Google account, and click the name of your desktop computer. Enter the PIN you created, and your laptop will display your desktop's screen. The connection works over the internet, so you can use this from anywhere, not just your home network.

Chrome Remote Desktop is free and does not require a specific Windows edition. The downside is that it is slower than local network remote desktop, especially if your internet speed is below 10 Mbps, and you cannot use it if your desktop computer is offline.

Using Spacedesk for True Display Extension

Spacedesk is the most popular free option for treating your laptop as a wireless second monitor. On your main desktop computer (Windows only), read and install Spacedesk Server from spacedesk.net. The server runs in the background and broadcasts your desktop over your local network.

On your laptop, read the Spacedesk Client app for Windows, Mac, Android, or iPad. Open the app, and it will automatically find your desktop computer on the network. Click your computer's name to connect. Your laptop screen will now show an extension of your desktop — you can drag windows from your main monitor to the laptop screen, and both screens remain active at the same time.

Spacedesk is free but has a paid version ($4.99 one-time) that removes ads and adds features like touch input and higher resolution support. The free version works well for most people. Performance depends on your Wi-Fi speed; a 5 GHz network is faster than 2.4 GHz, and you should be within 30 feet of your router for reliable performance.

USB-Connected Solutions for Faster Performance

If Wi-Fi performance is too slow or unreliable, you can connect your laptop to your desktop with a USB cable. Luna Display is a hardware dongle (about the size of a USB adapter) that plugs into your desktop's USB-C or Thunderbolt port and lets your laptop connect as a wireless second monitor. Luna Display works with Mac and iPad only, not Windows laptops.

For Windows-to-Windows setups, some USB display adapters exist, but they are less common and often require specific driver support. Check your laptop's specifications to see if it supports USB video input — many modern laptops do not, which is why Wi-Fi solutions are more practical.

USB connections are faster and more stable than Wi-Fi because they do not depend on network congestion or distance from your router. The trade-off is that your laptop must stay within a few feet of your desktop computer, and you need a compatible USB cable or adapter.

Troubleshooting Connection Problems

If your laptop cannot find your desktop computer, first check that both devices are on the same Wi-Fi network. Open your network settings on both computers and confirm they show the same network name. If they are on different networks (one on 5 GHz and one on 2.4 GHz, for example), switch one of them to match.

If the connection is slow or laggy, move your laptop closer to your Wi-Fi router, or switch to a 5 GHz network if available. Close other apps that use your network, like video streaming or large file downloads. Lower the resolution or refresh rate in the software's settings — Spacedesk and other display extension apps let you reduce quality to improve speed.

If your desktop computer is not appearing in the app, make sure the server software is running on your desktop (check your system tray or taskbar for the app icon). Restart both the server and the client app. If you are using remote desktop, confirm that your desktop computer is not locked — a locked screen will not accept remote connections.

Performance Expectations and Limitations

Using your laptop as a monitor is slower than a wired monitor because the image is being compressed and sent over your network. You will notice a slight delay (usually 50 to 200 milliseconds) between moving your mouse and seeing the result on the laptop screen. This is acceptable for web browsing, email, and document work, but it makes gaming, video editing, and fast-paced tasks frustrating.

Resolution and refresh rate are also limited by your network speed. Most Wi-Fi setups can handle 1080p at 30 Hz (30 frames per second), which is lower than a typical monitor's 60 Hz. If you need higher performance, use a wired monitor instead, or choose a USB-connected solution like Luna Display.

Battery life on your laptop will drain faster because the screen is on and the Wi-Fi radio is active. If you plan to use your laptop as a monitor for long periods, plug it in to power.

Frequently Asked Questions

Can I use my laptop as a monitor for a gaming console like PlayStation or Xbox?

Not directly — consoles output video signals that laptops cannot receive. You would need to use remote play software specific to the console (like PlayStation Remote Play or Xbox Game Pass Cloud Gaming), which streams the game to your laptop over the internet. This adds delay and is not ideal for competitive gaming.

Will this work if my laptop and desktop are on different networks?

Chrome Remote Desktop works over the internet, so yes. Windows Remote Desktop and Spacedesk require the same local network. If you need to use them across different networks, you can set up a VPN on both computers to connect them to the same virtual network, but this is complex and beyond this guide.

What if my laptop does not have Wi-Fi?

You can connect your laptop to your desktop with an Ethernet cable and a USB adapter (if your laptop has a USB port). This creates a direct wired connection that is faster and more reliable than Wi-Fi. Most remote desktop and display extension software will work over this connection.

Can I use my iPad as a monitor instead of a laptop?

Yes, if you use software that supports iPad. Spacedesk works on iPad, and Luna Display is designed for iPad. The setup is the same — install the client app on your iPad, connect to your desktop computer, and your iPad becomes a wireless second monitor.

Is it safe to use remote desktop software over the internet?

Remote desktop software is generally find if you use a strong password and keep your software updated. Chrome Remote Desktop adds extra security by requiring a PIN and a Google account. If you are concerned about security, use a VPN when connecting over the internet, and avoid using remote desktop on public Wi-Fi networks.