How to crop photos on iPhone without reducing quality?

I've discovered that the crop function in the standard Photos app reduces the resolution of the remaining portion of the photo (beyond what you would expect after removing part of the image). The Photos app seems to re-encode the image at a lower image quality than the Camera app achieved when it originally took the photo.
For example, if a I take a photo with the Camera at 2448x3264 (3.4MB), and crop all four edges a little in Photo, it reduces to 1536x2047 (992K). If I load the uncropped image into Preview on my Macbook, and do the same crop (as close as I can - and I tried to get it very close indeed) - the image is 2107x2860 (2.1MB). Furthermore, when I look at all three images - uncropped, iPhone-cropped and Preview-cropped - at "Actual size" in Preview, it's clear that the iPhone-cropped image has been reduced (ie. it appears "zoomed out", or smaller dpi) compared to either the uncropped or Preview-cropped images.
Does anyone know if there's a way to crop images on the iPhone without reducing the image quality in this way?

Thank you for the quick reply.
Yes, I understand that a crop function should just remove parts of the image without changing the resolution of what remains. But that's not what I see on the iPhone.
Let's say I have a photo taken on the iPhone which is 2000x3000, and there's a VW van in the photo which is roughtly 500x500 pixels in dimension. If I crop the photo to only include the van, I'd expect to have a 500x500 image. And indeed, that's what I see when I crop the photo in Preview on my Macbook.
When I perform the same crop in Photo on the iPhone, however, I get an image of the van which is smaller - only about 375x375 pixels. It's exactly the same part of the photo, but the iPhone seems to reduce the resolution of the remaining image, not just remove the parts that were cropped.
I'm looking for a way to crop an image on the iPhone without reducing the resolution of what remains. Anyone know of an app that can do that?

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