A consistent portrait shape can help a product series, an editorial set or a social carousel feel coherent. This preset uses a 4:5 example at 1080 by 1350 pixels. It does not mean every social service or gallery requires that shape. Check how your destination presents a portrait and whether its previews apply another crop.
Keep the original photographs and choose sources that can support the portrait composition. A wide group photo may be unsuitable when the important people span the frame. Fit within is available when preserving the whole image matters more than making the outputs identical. It keeps source proportions instead of adding a border. This tool cannot extend a background, rearrange people or create missing space above a head. Make those composition decisions before treating the collection as a uniform export batch.