How-to · Monitors
How to connect two monitors to a laptop (Windows and Mac)
Most Windows laptops can run two external monitors through their ports or a dock. Many MacBook Airs cannot, no matter the adapter. Step-by-step setup for both.
Connecting two monitors to a laptop comes down to how many independent display outputs the laptop supports, and which ports carry them. Start by checking your laptop's specs, then pick a connection method.
Step 1: Check what your laptop supports
- Look up the maximum number of external displays in the laptop's tech specs.
- Identify video-capable ports: HDMI, USB-C with a DisplayPort logo, or Thunderbolt (lightning-bolt logo).
- On a Mac, Apple's tech specs page lists external display support per model.
Step 2: Pick a connection method
| Method | Works on | Notes |
|---|---|---|
| One cable per port (HDMI + USB-C) | Most laptops | Simplest; uses two ports |
| Thunderbolt or USB-C daisy chain | Thunderbolt laptops and monitors with a downstream port | Monitor 1 passes video to monitor 2 |
| Thunderbolt dock | Thunderbolt and many USB4 laptops | One cable for both monitors, charging, and USB |
| DisplayPort MST hub | Windows only | macOS mirrors instead of extending |
| DisplayLink adapter or dock | Windows and macOS (with driver) | Adds displays beyond chip limits; uses CPU compression |
Step 3: Configure the displays
- Windows 11: Settings > System > Display. Choose Extend these displays, arrange the monitors, and set each one's scale and refresh rate.
- macOS: System Settings > Displays. Click Arrange, drag displays to match your desk, and choose the main display.
- Set the refresh rate on each monitor separately; Windows and macOS may default to 60Hz.
Questions we get
Can a MacBook Air run two external monitors?
It depends on the chip. M1 and M2 MacBook Airs support one external display. The M3 MacBook Air supports two with the lid closed, and the M4 supports two with the lid open. DisplayLink adapters with their own driver can add screens beyond these limits.
Why does my second monitor mirror instead of extend on a Mac?
macOS does not support DisplayPort MST hubs for extended displays, so cheap dual-HDMI hubs show the same image on both screens. Use separate Thunderbolt ports, a Thunderbolt dock, or a DisplayLink adapter.
How do I extend the display in Windows 11?
Press Windows + P and choose Extend, or open Settings > System > Display, select Extend these displays, then drag the monitor icons to match their physical layout.