Is there a way to play a video at 200% zoom on Mac with builtin programs like Preview or Quicktime?
Or do you need to install a third party video player like VLC?
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While there isn't any option to set a precise zoom value for a video playing in QuickTime, you can still zoom the video using various means:
In addition to above, a QuickTime or quick look preview window can be freely resized with the help of resizing handles to manually adjust zoom.
Turns out the simplest way to zoom in on a video beyond "fit to screen" is to use the Mac OS builtin Accessibility Zoom feature. I could not find any application that could do it (Finder Preview, Quicktime, VLC, MPV).
System Preferences > Accessibility > Zoom to see your keyboard/mouse shortcuts. For example, on my system I can use
ctrl + 2 finger trackpad scroll to zoom in/out. Or
opt + cmd + =/- with the keyboard. After you zoom in, you can use the mouse to pan around.