No - the app does not crop images.
The app adjusts your images to either 1:1 (square), 2:3 (portrait), or 4:3 (landscape) aspect ratio by adding spaces or borders around your images.
Check the samples below for how the borders are added.
1:1 (square)
*I used a light blue border here to make it more visible


2:3 (portrait)

4:3 (landscape)
