How to Use an iPad as a Second Monitor for Your Mac (Sidecar)

Whether you are coding a new website, editing a complex video timeline, or simply managing a chaotic email inbox while referencing a spreadsheet, having a single laptop screen often feels severely restrictive. For desktop users, the obvious solution is to purchase a second monitor. However, if you are travelling, working from a coffee shop, or simply lack the desk space for a permanent dual-screen setup, Apple has built an incredibly powerful alternative directly into macOS. By learning how to use an iPad as a second monitor for your Mac using the Sidecar feature, you can instantly expand your digital workspace wherever you are.

What is Apple Sidecar?

Sidecar is a native Apple ecosystem feature that allows your Mac to seamlessly cast a second, extended desktop directly to your iPad’s screen. Unlike third-party apps that suffer from severe lag and require complex driver installations, Sidecar is built directly into the operating system. It operates flawlessly over a wireless connection or via a USB cable, and it even allows you to use your Apple Pencil to interact with standard Mac applications as if your iPad were a professional drawing tablet.

Hardware and Software Requirements

Because Sidecar requires high-bandwidth video encoding to ensure zero latency, it is only available on relatively modern Apple hardware.

• Mac Compatibility: You need a MacBook Pro or MacBook Air from 2018 or later, an iMac from 2019 or later, or any Apple Silicon (M1/M2/M3) Mac. The Mac must be running macOS Catalina or newer.
• iPad Compatibility: You need an iPad Pro (all models), an iPad (6th generation or later), an iPad mini (5th generation or later), or an iPad Air (3rd generation or later). The iPad must be running iPadOS 13 or newer.
• Apple ID Requirements: Both devices must be signed into the exact same Apple ID using two-factor authentication.
• Wireless Connectivity: If using Sidecar wirelessly, both devices must have Bluetooth, Wi-Fi, and Handoff turned on, and they must be within 10 metres of each other. They cannot be sharing a cellular data connection.

Step-by-Step: How to Enable Sidecar

Once your hardware meets the requirements, initiating the dual-screen setup takes only a few seconds.

1. Turn on both your Mac and your iPad. Ensure they are unlocked and resting near each other.
2. On your Mac, look at the top menu bar (in the top-right corner) and click the Control Centre icon (it looks like two small toggle switches).
3. Click on Display (or Screen Mirroring on older versions of macOS).
4. Under the “Connect to” section, you should see the name of your iPad listed. Click on it.
5. Your iPad screen will briefly flash black, and it will immediately display your Mac’s desktop wallpaper. You now have a functional second monitor.

How to Arrange Your Displays

By default, your Mac might assume the iPad is sitting to the right of your laptop. If your iPad is physically sitting on your left, pushing your mouse cursor to the left edge of your Mac screen will not work. You must tell macOS exactly where the iPad is positioned.

1. On your Mac, open System Settings (or System Preferences).
2. Click on Displays in the left-hand sidebar.
3. You will see a visual representation of your Mac screen and your iPad screen.
4. Click and drag the iPad screen to perfectly match its physical location on your desk (left, right, or even above your Mac).
5. Click Done. You can now smoothly drag windows, browsers, and your mouse cursor seamlessly between the two devices.

Troubleshooting Common Sidecar Issues

If your iPad refuses to appear in the Display menu, the solution is usually straightforward:

• Use a Cable: Wireless interference in crowded offices can disrupt the connection. Plug your iPad directly into your Mac using a USB-C or Lightning cable. Sidecar will automatically prioritise the stable, wired connection and charge the iPad simultaneously.
• Check Apple IDs: Go to Settings on both devices and verify that the email address associated with the Apple ID is identical. A slight mismatch (e.g., using a work ID on the Mac and a personal ID on the iPad) will permanently block the feature.
• Turn on Handoff: On your Mac, go to System Settings > General > AirDrop & Handoff, and ensure “Allow Handoff between this Mac and your iCloud devices” is toggled on. Do the same on your iPad under Settings > General > AirPlay & Handoff.

By leveraging Sidecar, you unlock a massive productivity boost without spending a single penny on additional hardware, transforming your iPad from a simple media consumption device into a critical component of your professional workflow.