What are these lines in photos when viewed zoomed in on iPhone?

Question

I take photos on my Canon (It happens on both my Canon EOS Rebel t1i and my Canon EOS R) camera then download them onto my iPhone. Then when I zoom in close enough, there are these invisible lines on the image (when you follow them along they form a 3x3 grid on the image).This happens in every single image that I download from my camera to my iPhone. What are they, and if possible, how can I fix them?
Uncropped:

Half-Way Zoomed In:

Fully Zoomed-In:

xiota · Accepted Answer

The only lines I see are JPEG block artifacts. They typically occur along 8x8 pixel boundaries when images are compressed with low-quality settings. Solutions depends on when they are introduced to the image.

If introduced by the camera, use higher resolution and quality settings. ("Fine")

If you are resizing or otherwise processing images prior to transfer, you can try higher resolution and quality settings.

If introduced during transfer to the iPhone, change the transfer settings or method used to transfer.
If introduced after transfer to the iPhone, find the offending app and change its settings or remove it.

Do you have iCloud backups enabled? Is it set to remove images to save space? Is it saving original or compressed images?

What are these lines in photos when viewed zoomed in on iPhone?

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