Samsung Galaxy S6 User Manual page 185

3. Tap Edit > Crop.
 A crop box appears on the picture.
4. To adjust the crop box size, touch and hold the edge of the box. When directional arrows appear,
drag your finger inward to or outward to resize the crop box.

To move the crop box to the part of the picture that you want to crop, drag the crop box to the
desired size and position.
5. Tap SAVE to apply the changes to the picture.
 The cropped picture is saved in the album as a copy. The original picture remains unedited.
Camera and Video 176