Yes, you can use a laptop as a monitor for another computer. The process is not built-in, but you can learn how to use a laptop as a monitor with the right tools and a few steps.
Many people have an old laptop sitting in a drawer. It feels like a waste to just leave it there. You might want a second screen for work or gaming.
I’ve tried this setup myself many times. It can save you money on a new monitor. Let’s look at the best ways to make it work.
This guide will show you the simple methods. We’ll cover cables, software, and common problems.
What You Need to Know First
Here’s the big thing to understand. Your laptop’s video port is usually for output only.
That means it sends a picture out to another screen. It does not take a picture in from another computer. This is the main hurdle you face.
So how do you use a laptop as a monitor? You need to work around this limit. The good news is, it’s totally possible.
You have two main paths to pick from. You can use special software on both machines. Or, you can use specific hardware capture cards.
I’ll walk you through both options. Each one has its own pros and cons for your setup.
According to Microsoft, screen sharing tools have gotten a lot better. This makes the software route easier than before.
Method 1: Using Software to Share Screens
This is the most common way people do it. You install a program on both your main PC and your laptop.
The software lets the laptop show your main PC’s desktop. It’s like remote control, but just for viewing the screen.
Popular programs for this include SpaceDesk, Splashtop, and Windows built-in tools. Some are free, and some cost money.
To use a laptop as a monitor with software, both devices must be on the same network. A wired connection is best for a smooth picture.
Set up can take ten to fifteen minutes. You need to follow the program’s guide for both computers.
I find SpaceDesk very simple for basic use. It turns your laptop into a wireless second screen fast.
Method 2: Using a Capture Card
This method uses a piece of hardware. It’s a more direct way to get the video signal.
You connect your main PC’s video output to the capture card. Then, you plug the card into your laptop’s USB port.
The laptop sees the card as a video source. You use software on the laptop to view that source full screen.
This method is great for low lag. Gamers often use it to stream, but it works for a monitor too.
The downside is you need to buy the capture device. It also uses one of your laptop’s USB ports.
If you want to learn how to use a laptop as a monitor for gaming, this is a solid pick. The response time is better than wireless software.
Step-by-Step Guide for Software (Windows)
Let’s get into the details. I’ll use the Windows “Project to this PC” feature as an example.
First, on your laptop, go to Settings. Then, click on System and find “Projecting to this PC”.
Turn on the setting that says “Some Windows and Android devices can project”. Set it to “Available everywhere” for ease.
Now, on your main desktop PC, press the Windows key + P. This opens the projection menu.
Choose “Connect to a wireless display”. Your laptop should show up in the list after a moment.
Select your laptop’s name. After a few seconds, your laptop screen will show your desktop’s display. You just learned how to use a laptop as a monitor wirelessly.
Remember, both PCs need to be on the same Wi-Fi. Performance depends on your network speed.
Step-by-Step Guide for a Capture Card
Start by buying a USB capture card. Elgato and AVerMedia are popular brands.
Connect an HDMI cable from your main PC’s graphics card to the input on the capture card.
Plug the capture card into your laptop’s USB port. Use a USB 3.0 port if you have one for better speed.
On your laptop, you might need to install the card’s software. Some cards work with free tools like OBS Studio.
Open the software and add the capture card as a video source. Set the preview to full screen.
This process shows you how to use a laptop as a monitor with a cable. It’s more reliable than wireless for fast motion.
The FCC has info on electronic device compatibility. Always check your gear works together.
What About Mac Computers?
Apple has its own system called Sidecar. It lets you use an iPad as a second screen.
Using a MacBook as a monitor for another Mac is possible with Target Display Mode. But this only works on older Mac models.
For a newer Mac laptop, you’ll need third-party software. Duet Display is a good paid option that works well.
You can also try the free app called Luna Display. It uses a small hardware dongle for a strong connection.
The steps are similar to Windows. Install the app on both machines and follow the setup guide.
If you want to know how to use a laptop as a monitor for a PC from a Mac, software is your best bet. The hardware ports are often not compatible.
I’ve used Duet to connect a Windows PC to a MacBook. It worked, but it was not perfect for gaming.
Common Problems and Fixes
You might run into a laggy or delayed picture. This is the biggest complaint people have.
To fix lag, use a wired network connection for software methods. For capture cards, ensure you’re using USB 3.0.
Another issue is the screen not showing up at all. Check your firewall settings on both computers.
Sometimes, the software might block the connection. You may need to allow it in your security software.
If the picture looks blurry, check the resolution settings. Make sure it’s set to your laptop’s native resolution.
Learning how to use a laptop as a monitor means troubleshooting. Don’t get frustrated if it doesn’t work right away.
The FTC advises on safe software downloads. Only get programs from official sources.
Why Would You Want to Do This?
It saves you money. A second monitor can cost a hundred dollars or more.
It gives an old laptop a new job. Instead of e-waste, it becomes a useful tool.
It’s great for a temporary setup. Maybe you’re working away from your main desk.
You can have a dedicated screen for chat or music. Keep your main screen clean for your work.
It’s a fun tech project. I enjoy finding new uses for old gear.
Now you know how to use a laptop as a monitor. Think about where it could help you.
Students on a budget love this trick. It doubles their screen space for writing papers.
Limitations to Keep in Mind
The screen might not be as bright or clear as a real monitor. Laptop screens are made for close viewing.
There will always be a tiny bit of lag. It’s not good for fast competitive gaming.
It uses your laptop’s resources. The laptop will run warmer and the battery will drain if not plugged in.
You can’t use the laptop’s own keyboard and mouse for the main PC easily. They will control the laptop itself.
Setting it up takes time. It’s not as simple as plugging in a regular monitor.
When you learn how to use a laptop as a monitor, know these limits. It’s a good solution, but not a perfect one.
For color-critical work like photo editing, I would not recommend it. The color accuracy might be off.
Tips for the Best Experience
Always plug your laptop into power. Running the screen and software kills the battery fast.
Use an Ethernet cable to connect both PCs to your router. This cuts down on wireless lag a lot.
Close other programs on your laptop. Give all the power to the screen sharing task.
Lower the resolution on the laptop screen if the picture is choppy. A lower resolution is easier to stream.
Set the laptop to never sleep. You don’t want the screen to go black in the middle of your work.
Following these tips will make your journey to use a laptop as a monitor much smoother. A little prep goes a long way.
I keep a spare network cable just for this purpose. It makes a huge difference in how well it works.
Is It Worth the Effort?
For a free second screen, yes, it is worth it. The cost is just your time to set it up.
If you need a low-lag screen for gaming or video, maybe not. A cheap used monitor might be a better buy.
Think about how often you’ll use it. For daily use, the software method is fine.
For occasional use, it’s a fantastic trick to know. It can get you out of a pinch.
Now that you know how to use a laptop as a monitor, you can decide. Try the free software method first to test it.
You might find you love the extra screen space. I did, and now I use an old laptop all the time for my side tasks.
The U.S. Department of Energy talks about reusing electronics. It’s better for the planet than throwing them away.
Frequently Asked Questions
Can I use a laptop as a monitor with just an HDMI cable?
No, you usually cannot. Most laptop HDMI ports only send video out. They do not take video in from another device.
How to use a laptop as a monitor for a PlayStation or Xbox?
You would need a capture card. Connect the console to the card, and the card to the laptop. Then use software on the laptop to see the picture.
Does using my laptop as a monitor damage it?
No, it does not cause damage. It might make the laptop run warmer, which is normal for extra work.
What is the best free software to use a laptop as a monitor?
I like SpaceDesk for Windows. It’s free and works well for basic tasks. For Mac, try the built-in Screen Sharing features first.
Can I use a laptop as a monitor for a security camera?
Yes, this is a great use. Many camera software lets you view feeds. Your laptop becomes a dedicated monitoring station.
How to use a laptop as a monitor with the lowest lag?
Use a USB capture card with a wired connection. This method has less delay than any wireless software option.
Conclusion
So, how to use a laptop as a monitor? You have clear paths now. Software is easiest for most people.
Capture cards are best for smooth video. Pick the method that fits your needs and budget.
Give it a try with an old laptop you have. You might be surprised at how useful it becomes.
This skill saves money and reduces waste. It’s a win-win for your wallet and your workspace.