In the camera app's settings you can change the resolution of the pictures or videos your device will take. A lower resolution photo will take up less space on your device but may not look as good as a high resolution photo.
1.
From the Camera app, tap the Settings icon.
2.
Under rear camera, tap Photo size.
3.
Select your preferred photo size.
4.
Swipe from the left or right edge of the screen to view your changes.