How to Use a Laptop as a Second Monitor for Free

Are you looking for a way to increase productivity without spending extra money on an additional screen? Using a laptop as a second monitor can be a game-changer for multitasking, gaming, and improving workflow efficiency. In this guide, we’ll walk you through different methods to turn your laptop into a second screen for free.

Why Use a Laptop as a Second Monitor?

Using a dual monitor setup can significantly improve productivity by allowing you to:

• Work on multiple applications simultaneously
• Edit videos and photos more efficiently
• Extend your gaming experience
• Stream and monitor content without switching tabs

If you don’t want to invest in an extra display, repurposing an old laptop as a second screen is a cost-effective solution.

How to Use a Laptop as a Second Monitor on Windows

Windows 10 and Windows 11 come with a built-in feature that allows you to extend your primary screen wirelessly. Follow these steps to set it up:

1. Enable “Projecting to This PC” on the Laptop

1. Open Settings on the laptop you want to use as a second monitor.
2. Go to System > Projecting to this PC.
3. Under Some Windows and Android devices can project to this PC, select Available everywhere or Available everywhere on secure networks.
4. Set up Ask to project to this PC to Only the first time for convenience.
5. Ensure both devices are connected to the same Wi-Fi network.

2. Connect the Primary PC to the Laptop Display

1. On your primary Windows PC, press Windows + P to open the projection menu.
2. Click Connect to a wireless display and select your laptop from the list.
3. Choose Extend to use it as a second screen.

This method is simple and requires no extra software, but it works best with a stable Wi-Fi connection.

How to Use a MacBook as a Second Monitor with Sidecar

If you own an iPad or another Mac, Apple’s Sidecar feature allows you to use it as a second display. Here’s how:

1. Make sure both devices are signed into the same Apple ID and connected via Wi-Fi or USB.
2. On your Mac, go to System Preferences > Displays > Add Display.
3. Select your iPad or Mac from the list.
4. Choose Extend Display to use it as a second monitor.

Sidecar is available on macOS Catalina and later versions and provides seamless integration with Mac and iPad devices.

Using Third-Party Software to Extend Your Display

If you’re using different operating systems or want additional flexibility, third-party software solutions can help. Some popular options include:

Spacedesk (Windows & Android/iOS)

• Allows you to use a tablet or another PC as a second monitor
• Works over Wi-Fi or USB
• Supports touch functionality

Deskreen (Cross-Platform)

• Converts any device with a web browser into a second screen
• Requires a stable internet connection
• Free and open-source

Barrier (Linux, Windows, macOS)

• Works well for using multiple computers with one keyboard and mouse
• Ideal for Linux and cross-platform setups

These tools offer wireless and wired connections, depending on your preference.

Troubleshooting Common Issues

If you experience connection issues, try the following fixes:

• Ensure both devices are on the same Wi-Fi network.
• Restart your router if you notice lag or disconnection.
• Update graphics drivers to prevent display errors.
• If using third-party software, check firewall settings to allow communication.

Final Thoughts

Using a laptop as a second monitor is a great way to enhance productivity without additional costs. Whether you use Windows’ built-in Wireless Display, Apple’s Sidecar, or third-party tools like Spacedesk and Deskreen, the right method depends on your operating system and needs.