Yes, you can use your Mac as a monitor for another computer. The best way to use a Mac as a monitor is with Apple’s built-in tools like AirPlay or Sidecar, which let you share your screen wirelessly.
This is a great trick if you have an extra Mac sitting around. It can save you money on a new screen. You just need to know the right steps to make it work.
I’ve tried this method with my own MacBook and iMac. It’s easier than you might think. You don’t need to buy any special cables or software in most cases.
This guide will show you the simple ways to do it. We’ll cover the free methods and the ones that cost a little money. You’ll learn how to use a Mac as a monitor in no time.
What Does “Use Mac as a Monitor” Mean?
Let’s break this down first. Using a Mac as a monitor means your Mac’s screen shows another computer’s desktop.
The other computer does all the hard work. Your Mac just acts like a window to see it. Think of it like a TV for your other computer.
This is handy in a few common situations. Maybe your main computer’s screen broke. Or you want a bigger display for your laptop when you’re at your desk.
You might also want to use a Mac as a monitor for a gaming PC. This lets you play PC games on your nice Mac screen. It’s a clever way to get more use from your gear.
Apple makes this pretty easy with their own tools. But you can also use a Mac as a monitor for Windows machines. It just takes a few extra steps to set up.
Why You Might Want to Use a Mac as a Monitor
There are some good reasons to try this. The first one is saving money. A good monitor can cost hundreds of dollars.
If you have an old Mac, you already have a great screen. Learning how to use a Mac as a monitor turns old tech into something useful. It keeps stuff out of the landfill too.
Mac screens are often very nice. They have good colors and sharp text. Using a Mac as a monitor gives you a better viewing experience than many cheap screens.
It’s also great for travel. If you bring a small laptop and a Mac mini, you can use the laptop’s screen. But at home, you can use the Mac mini with your iMac’s big, beautiful display.
I use my iMac as a monitor for my work laptop sometimes. It lets me have a big screen without buying another one. The setup takes me about two minutes now.
The Easiest Way: Use AirPlay to Turn Your Mac into a Monitor
This is the simplest method for most people. AirPlay lets you share your screen over Wi-Fi. It’s built right into macOS.
First, make sure both computers are on the same Wi-Fi network. They need to be able to talk to each other. Check this in your network settings.
On the computer you want to see (the source), look for the AirPlay icon. It’s in the menu bar, shaped like a rectangle with a triangle at the bottom. Click it and pick your Mac’s name from the list.
Your Mac’s screen will now show the other computer’s desktop. You can use your Mac’s keyboard and mouse to control it. This is a wireless way to use a Mac as a monitor.
There is one big catch with AirPlay. Both computers need to be Apple machines. You can’t use AirPlay to show a Windows PC on your Mac screen. It only works from Mac to Mac or iPad to Mac.
According to Apple’s support site, you need macOS Monterey or newer for this to work. Older Macs might not have the right AirPlay receiver feature. Check your Mac’s version in the Apple menu.
How to Use Sidecar for a Mac-to-Mac Monitor Setup
Sidecar is another Apple tool. It’s made to use an iPad as a second screen for your Mac. But you can use it in a clever way for Mac-to-Mac setups too.
The trick is to use an app called Duet Display. It works like Sidecar but between two Macs. You install it on both computers you want to connect.
Duet Display creates a wired connection between your machines. You use a USB cable to link them. This gives you a faster response than Wi-Fi, which is good for video or games.
When you want to use a Mac as a monitor with Duet, just plug in the cable. The app opens and shows the other computer’s screen. It feels just like having a real external monitor.
This method costs a little money. Duet Display is a paid app. But it often goes on sale, and it works very well for this specific job.
I’ve used Duet to turn my MacBook into a monitor for my desktop. The cable keeps the connection stable. There’s no lag when I’m typing or moving windows around.
Using Target Display Mode on Older iMacs
Apple used to have a feature called Target Display Mode. It was built for this exact purpose. You could use certain iMacs as monitors for other Macs.
This feature worked on iMacs made between 2009 and 2014. If you have one of these older iMacs, you’re in luck. You can use it as a monitor with just a cable.
Check your iMac’s model year first. Click the Apple logo in the top left. Choose “About This Mac” to see the year it was made.
For this to work, you need the right cable. Usually, it’s a Mini DisplayPort or Thunderbolt cable. The cable type depends on the ports your iMac has.
Connect the cable between the two Macs. Then press Command-F2 on the iMac’s keyboard. The iMac screen should switch to show the other Mac’s display.
It’s a shame Apple removed this feature from newer iMacs. It was a perfect way to use a Mac as a monitor. If you have an old iMac, this is your best free option.
How to Use a Mac as a Monitor for a Windows PC
This is a common question I get. People want to use their nice Mac screen with their Windows gaming PC. It takes a bit more work, but you can do it.
You’ll need special software for this job. AirPlay and Target Display Mode won’t work with Windows. The computers don’t speak the same language.
I recommend an app called Space Desk. You install it on both your Windows PC and your Mac. The Windows PC acts as the server, and the Mac connects to it as a client.
Both computers need to be on the same network. Open Space Desk on your Mac. It should find your Windows PC in the list of available displays.
Click connect, and your Mac screen will show the Windows desktop. You can now use a Mac as a monitor for PC games or Windows software. The Microsoft support site has tips on network sharing that can help this process.
There might be a little lag with this method. It’s fine for most work, but fast-paced games might not feel perfect. For office tasks and web browsing, it works great.
Step-by-Step Guide to Set Up AirPlay Display
Let’s walk through the AirPlay method step by step. This is how I use a Mac as a monitor most often. It’s quick once you know the steps.
Step one: Update both Macs. Go to System Settings, then General, then Software Update. Make sure both are running macOS Monterey or newer.
Step two: Connect to the same Wi-Fi. This is very important. Both computers must be on the same wireless network for AirPlay to work.
Step three: On the Mac you want to use as the monitor, go to System Settings. Click Displays, then find the “AirPlay Receiver” option. Turn this setting on.
Step four: On the source Mac (the one with the content), click the Control Center icon. It’s in the top right menu bar. Look for the Screen Mirroring option and click it.
Step five: Pick your other Mac’s name from the list. In a few seconds, you’ll use a Mac as a monitor. The screen will mirror or extend, just like a real second display.
Step six: To stop, click the AirPlay icon again. Choose “Turn AirPlay Off” from the menu. Your Mac’s screen will go to normal.
Common Problems and How to Fix Them
Sometimes things don’t work right away. Don’t worry. Most problems have simple fixes when you try to use a Mac as a monitor.
Problem one: AirPlay can’t find the other Mac. Check your Wi-Fi first. Both computers must show the same network name. Restarting your router can sometimes help.
Problem two: The connection is slow or laggy. This happens if your Wi-Fi is busy. Try moving closer to your router. Or use a wired Ethernet connection if your Macs have the ports.
Problem three: The screen looks blurry. Go to the source Mac’s Displays settings. Make sure the resolution matches your Mac monitor’s native resolution. This makes everything sharp.
Problem four: You hear audio from the wrong place. When you use a Mac as a monitor, sound might play from the source computer. Change the audio output in the source Mac’s Sound settings.
Problem five: Your mouse won’t move between screens. This happens with some setups. You might need to use a single keyboard and mouse connected to the source computer. Or try a tool like Synergy to share input devices.
Wired vs. Wireless: Which is Better?
You have two main choices for connection type. Wireless is easier to set up. Wired is often faster and more reliable.
Wireless methods like AirPlay are super convenient. You don’t need any cables on your desk. Just click a few buttons and you’re done.
But wireless can have lag. If you’re watching video or playing games, you might notice a delay. The picture might stutter if your Wi-Fi signal is weak.
Wired connections fix these problems. Using a USB-C or Thunderbolt cable gives you instant response. There’s no compression or network traffic to slow things down.
I use wireless for basic work like writing emails. When I edit photos or videos, I switch to a wired setup. It just feels smoother and more precise.
Think about what you’ll do on the screen. For most office tasks, wireless is fine. For creative work or games, go wired. Choose based on how you plan to use a Mac as a monitor.
What You Need Before You Start
Let’s make a quick checklist. Gather these things before you try to use a Mac as a monitor. It will save you time and frustration.
First, you need two computers. One will be the source, and one will be the monitor. Both should be turned on and logged in.
Second, check your macOS versions. Newer methods need newer software. Go to Apple menu > About This Mac to see your version number.
Third, have the right cables ready if you’re going wired. For modern Macs, that’s usually USB-C or Thunderbolt 3/4. Older Macs might need Mini DisplayPort or Thunderbolt 2 cables.
Fourth, make sure you have enough power. Laptops being used as monitors should be plugged in. The screen uses a lot of battery if it’s not connected to power.
Fifth, update your software. Go to System Settings > General > Software Update on both Macs. Install any available updates before you start.
The Apple Support site has detailed guides for different Mac models. Check there if you run into model-specific issues when you use a Mac as a monitor.
Creative Ways to Use Your Mac as a Monitor
Once you know how to do it, you can get creative. Here are some cool ways I’ve used a Mac as a monitor in my own setup.
Use an old MacBook as a dedicated security monitor. Set up a security camera feed on one computer. Then use your MacBook screen to watch it all day. It’s cheaper than buying a security monitor.
Create a digital photo frame. Load a slideshow of family photos on one Mac. Use another Mac’s screen to display it on your wall or desk. It looks great and uses gear you already own.
Make a streaming dashboard for your smart home. Show your security cameras, weather, and calendar on a Mac screen. Mount it on the wall in your kitchen or office.
Set up a dedicated video call station. Use one Mac for processing the call. Use another Mac’s bigger screen as your main view. This gives you a clean, focused setup for work meetings.
These ideas show how flexible this trick can be. You’re not just extending your desktop. You’re finding new jobs for old computers when you use a Mac as a monitor.
Safety and Security Tips
When you share your screen, think about security. You don’t want strangers seeing your private stuff. Follow these simple safety rules.
Only use AirPlay on networks you trust. Public Wi-Fi at coffee shops isn’t safe for screen sharing. Someone else on the network might see your display.
Turn off AirPlay receiver when you’re done. Go to System Settings > Displays and switch it off. This stops other devices from trying to connect to your Mac.
Use a wired connection for sensitive work. If you’re dealing with private documents or financial info, skip the wireless. Plug in a cable instead.
Be careful with password entry. When you use a Mac as a monitor, your keystrokes might go over the network. Type passwords directly on the source computer if you’re worried.
The FCC website has good general tips for wireless security. They recommend using WPA3 encryption on your home Wi-Fi. This helps protect all your connected devices.
Remember that your Mac screen is now showing another computer’s content. Treat it like any other shared display. Don’t leave private information visible when you walk away.
Frequently Asked Questions
Can I use a MacBook as a monitor for a PC?
Yes, but you need special software. Apps like Space Desk or Duet Display can make this work. You install the software on both computers and connect them over your network or with a cable.
How do I use a Mac as a monitor for free?
The free way is with AirPlay, but only for Mac-to-Mac connections. Make sure both Macs are on macOS Monterey or newer. Turn on AirPlay Receiver in the Displays settings on the Mac you want to use as the monitor