Macworld
How to maintain video resolution when sharing videos via AirDrop
In some cases, high-resolution images and videos taken on an iPhone or iPad will be downsized or downsampled en route to a Mac.
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AirDrop lets you easily transfer items of all sorts among Apple devices. If you don't have iCloud Photos enabled, the next easiest way to shift a movie you shot on your iPhone to your Mac is via AirDrop. However, some people have found the resulting video is of lower resolution or quality than the original on the iPhone. AirDrop isn't designed to reduce fidelity, so what's at work?