GoKawiilGuide details Wi-Fi and HDMI methods to turn a spare laptop into second monitor
The guide outlines how to repurpose a spare laptop as a second display: Mac-to-Mac users can use AirPlay on MacBooks from 2018 or later by enabling AirPlay Receiver in System Settings and linking both devices via the same Apple ID. For mixed operating systems, including Windows and Linux machines, it recommends Deskreen, a free open-source tool that connects laptops over shared Wi-Fi via a QR code or URL, with an HDMI dummy plug needed to extend rather than just mirror the display.
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These workarounds let people reuse old laptops as extra screens without buying new hardware, which could appeal to remote workers or budget-conscious users needing more screen space. The guide notes that Wi-Fi-based solutions like AirPlay and Deskreen introduce some lag, suggesting a wired HDMI setup remains preferable for tasks like gaming where responsiveness matters more.
- AirPlay works only between MacBooks from 2018 or later, requiring the same Apple ID on both devices.
- Deskreen is a free tool enabling screen-sharing between different operating systems via Wi-Fi and a QR code.
- Wireless methods can introduce lag, so a wired HDMI connection with a dummy plug is better for latency-sensitive use.
UGREEN USB-C to HDMI Cable — For a wired, low-lag alternative to AirPlay or Miracast when turning a laptop into a second screen, a solid USB-C to HDMI cable gets the job done without Wi-Fi hiccups. It's a cheap, simple accessory that pairs perfectly with the HDMI method mentioned in the article.
See UGREEN USB-C to HDMI Cable on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: engadget.com — Kari Paul, 2026-11-09
Published there as: “How to use your laptop as a second monitor”
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