If you have an iPhone 6 or newer, you can change the speed and resolution at which your phone captures recorded video and slow motion video. If you prefer to use less storage and really only look at your videos on your phone, a lower resolution can help you save space. If you want higher resolution captures (like 4K) or smoother video (like 60fps), bumping up the settings costs some storage space, but might be worth it for you.
Unfortunately, you can’t adjust these settings on the fly from the Camera app. You have to dive into Settings to make the adjustment. Here’s how.