Keynote
Keynote User Guide for iPhone
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Change the slide size in Keynote on iPhone
You can change the slide size to fit screens with different aspect ratios.
Note: You can’t change the slide size of a presentation you’re sharing with others.
Change the slide size
Tap
in the toolbar, then tap Document Setup.
Tap Slide Size, then tap a size.
If you choose Custom, enter slide dimensions, then tap Done.
Tap
or
to preview slides in the new size.
Tap Done.
Thanks for your feedback.