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Frequently asked questions
How is the ratio simplified?
The greatest common divisor of the width and height is calculated and divided out, reducing the ratio to its simplest whole-number form (e.g. 1920x1080 simplifies to 16:9).
Does it round the proportional height?
Yes, the calculated height is rounded to the nearest whole pixel, since fractional pixels aren’t meaningful for most use cases.
Can I go from height to width instead?
This version calculates a new height from a given width; to go the other direction, swap which values you treat as "original" width/height.