What "linking" monitors actually means
Linking two monitors means connecting them both to the same computer so they display as one extended workspace, or mirror the same image. You are not connecting the monitors to each other — you are connecting both of them to your computer's video outputs. The monitor cables run from each monitor back to your computer, not from one monitor to the other.
Most people use two monitors to expand their workspace: one screen shows your email while the other shows a spreadsheet, or one shows a video call while the other shows your notes. Some setups mirror instead, showing the same thing on both screens — useful for presentations or when you want a backup display.
The setup takes about ten minutes if your computer already has the right ports. If it does not, you may need an adapter or a new graphics card, which changes the cost and complexity.
Key Takeaways
- Your computer needs two video outputs — HDMI, DisplayPort, USB-C, or VGA — one for each monitor cable.
- Windows and Mac both let you extend your display across two monitors through display settings, with no extra software needed.
- If your computer has only one video port, you need an adapter or docking station to add a second output.
- Older laptops sometimes cannot drive two external monitors at full resolution even with adapters, so check your computer's specs first.
- The monitors themselves do not need to match — different sizes and brands work together fine.
Check what video ports your computer has
Open the back or sides of your computer and look for video ports. The most common ones are HDMI (a flat rectangular port, usually black), DisplayPort (a smaller rectangular port with a notch), USB-C (a small oval port that also charges some laptops), and VGA (a port with three rows of small holes, older computers only).
If you see two or more of these ports, you can connect two monitors directly. If you see only one, you will need an adapter. Laptops often have fewer ports than desktop computers, so check your laptop's manual or the manufacturer's website if you cannot identify the ports by looking.
Write down which ports you have and what type they are. You will need this information to buy the right cables or adapters.
Get the right cables and adapters
Each monitor needs a cable that matches both the monitor's input port and your computer's output port. Most modern monitors have HDMI or DisplayPort inputs. Check the back of each monitor to see what it accepts.
If your computer has two HDMI ports and your monitors have HDMI inputs, buy two HDMI cables — one for each monitor. If your computer has one HDMI and one DisplayPort, buy one HDMI cable and one DisplayPort cable. If your computer has only one video port, buy a USB-C hub or docking station that adds extra video outputs — these plug into your computer's USB-C port and give you two or more HDMI or DisplayPort outputs on the back.
Adapters that convert one type of port to another (like HDMI to DisplayPort) exist but are less reliable than native cables. If possible, use cables that match your ports directly.
Connect the monitors and turn them on
Plug one monitor cable into the first video port on your computer and the other cable into the second port. Turn on both monitors. Your computer should detect them within a few seconds.
If nothing appears on one or both screens, restart your computer. If one monitor still shows nothing, try swapping the cables between the two ports — sometimes a port is disabled in the computer's settings. If the monitor has a brightness or input button on its frame, press it and make sure it is set to the correct input (HDMI 1, HDMI 2, DisplayPort, etc.).
Set up the display layout in your operating system
On Windows: Right-click on the desktop and select "Display settings". Scroll down to the "Multiple displays" section. You will see two numbered boxes representing your monitors. Choose "Extend these displays" to use them as one large workspace, or "Duplicate these displays" to show the same thing on both. Click "explore" and then "Keep changes".
On Mac: Click the Apple menu, go to "System Settings", then "Displays". Click "Arrangement" at the top. You will see two rectangles representing your monitors. Drag them to match how they are physically positioned (side by side, one above the other, etc.). Close the window — the change saves automatically.
If you do not see both monitors listed, your computer has not detected one of them. Check that both cables are fully plugged in, that the monitors are powered on, and that you are using the correct input on each monitor.
Adjust resolution and refresh rate if needed
After extending your display, you may notice that one monitor looks blurry or has a lower resolution than the other. This happens when your computer is not using the monitor's native resolution — the resolution it was designed for.
On Windows: Go back to Display settings, click on one monitor, scroll down to "Display resolution", and select the highest number in the list. Repeat for the second monitor. If the text looks too small or too large, adjust the "Scale" setting below the resolution.
On Mac: In System Settings, click on one display, then "Resolution". Choose "Scaled" and pick the option that looks sharpest. Repeat for the second display.
If your computer cannot run both monitors at their native resolution at the same time, you may need a more powerful graphics card or a newer computer. Check your computer's manual to see the maximum resolution it supports across multiple displays.
Troubleshoot if one monitor is not detected
If you have plugged in both cables and turned on both monitors but your computer only shows one, try these steps in order: First, restart your computer. Second, unplug both monitor cables, wait ten seconds, and plug them back in. Third, try swapping which port each monitor is plugged into — sometimes one port is disabled.
If the second monitor still does not appear, check your computer's graphics settings. On Windows, right-click the desktop, select "Display settings", scroll to the bottom, and click "Advanced display settings". Look for a section called "Multiple displays" or "Detect". On Mac, hold Option and click the Displays icon in the menu bar, then select "Detect Displays".
If you are using a USB-C hub or docking station, make sure it is plugged into power — many hubs need their own power cable to drive multiple monitors. Check the hub's manual to confirm.
Frequently Asked Questions
Can I connect two monitors to a laptop?
Yes, but it depends on your laptop's ports. Most modern laptops with USB-C or Thunderbolt can drive two external monitors with the right adapter or docking station. Older laptops may only support one external monitor even with adapters. Check your laptop's manual or the manufacturer's website to confirm how many external displays it supports.
Do the two monitors have to be the same size or brand?
No. You can mix different sizes, brands, and resolutions. Your computer will treat them as separate displays and let you position them however you want. The only requirement is that they both have a video input port that matches a cable you can connect to your computer.
What if my computer only has one video port?
Buy a USB-C hub, Thunderbolt dock, or USB-C adapter that has two or more video outputs. Plug it into your computer's USB-C port and connect your monitors to the outputs on the hub. Make sure the hub is powered — many require their own power cable to work with multiple monitors.
Will using two monitors slow down my computer?
Slightly, but usually not enough to notice. Two monitors use more graphics processing power than one, but modern computers handle it easily for everyday tasks like email, web browsing, and documents. Demanding tasks like video editing or gaming may see a small performance drop, especially on older computers or laptops.
Can I connect monitors to each other instead of to my computer?
No. Monitors are display devices only — they have no ability to connect to each other or to share a signal. Both monitor cables must run back to your computer. Some monitors have a second video input for daisy-chaining, but this is rare and still requires one cable to come from your computer.