What this is actually doing.
This is the focused version of “Margin & safe area calculator”: do the one job, inspect the result, and move on without opening a full editor.
Presentation & Layout
Margin & Safe Area Calculator.
Work out an inset safe area from a page or slide width.
1 Enter2 Adjust3 Use result
Input
Answer
1680 × 840px
Safe area inside 1920 × 1080px with 120px margins
Keeps critical text and logos away from the edge.
Useful to know
Four things worth knowing.
Where it stops.
It solves the named job, not every problem around it.
What to inspect.
View the slide full-screen. Editing view can hide how crowded a layout feels when presented.
Worth knowing.
Keep the original until the finished result has worked in the place you made it for.