Crop before you scale
Order of operations when a form demands an aspect ratio.
If you scale a landscape snapshot into a tall portrait box, the face becomes a small band or the picture stretches. Crop to the required aspect first, then scale into the pixel box, then compress.
Resize offers no crop, a square, 3:4, 4:3, 16:9, and 35:45. The X and Y sliders move the window. 50 and 50 keep it centered. 35:45 is the portrait shape you can select on Photo check. The page allows about 3 percent of slack. Fit can stay inside the pixel box or fill it. A 3:4 crop is 0.75; 35/45 is 0.778, so the preset’s gap covers a 3:4 result, and the 35:45 crop is the tighter match.
Leave a little room around the head before you export. The tool does not know where a face is. It only knows the rectangle you set.