Can I use my Mac air adapter for my iPhone?
Adapter which I use to charge my MacBook Air Can I use the same adapter to charge my iPhone 13 pro max.
MacBook Air 13″, macOS 11.5
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Yes. The larger power adapter will not harm your phone. The phone will not draw more power than it was designed for. Also see the following from Charge your iPhone with an iPad or Mac notebook power adapter - Apple Support
You can use Apple USB power adapters for iPad and Mac notebooks to charge iPhone, iPod, Apple Watch, AirPods, and other Apple products.