How to Change the Size of a Slide on Keynote

Open a new or existing Keynote presentation.
Click on the blue 'Inspector' button in the toolbar. Click the 'Document' pane then click the 'Document' button.
Click the 'Slide size' pull-down menu at the bottom of the window. Select the desired slide size from the pre-sets or click 'Custom Slide Size' to enter the desired width and height in pixels. Click 'OK' to confirm the size.
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How to Open a .Pptx in Keynote on an IPad (6 Steps)

Open the Keynote app on your iPad, then tap the folder icon near the top of the app's main screen.
Tap your PPTX file's name in the file list on the Import Presentation screen to open the file.
Drag your finger to the right across the screen to flip through each slide, or tap the triangle near the top of the app to play the presentation automatically. You can also tap a slide and tap the wrench icon to edit its format and content.
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