Go to Settings > Camera.

You can select resolution and FPS for video & slo-mo. However, you cannot change the photo resolution.

You you will also be able to choose between high efficiency, using HEIF/HEVC, or most compatible, using JPEG/H.264. This does not directly affect the resolution, but does affect how large the photo and video files are.

Answer from Theologin on Stack Exchange
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Apple Support
support.apple.com › guide › iphone › change-advanced-camera-settings-iphb362b394e › ios
Change advanced camera settings on iPhone - Apple Support
Learn about advanced iPhone camera ... change the default resolution of the Main or Fusion cameras from 24 MP to 12 MP. Go to Settings > Camera > Formats > Photo Mode, then choose 12 MP or 24 MP....
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HowToiSolve
howtoisolve.com › home › how to change photos resolution on iphone 17,16,15, 14, 13
How to Change Photos Resolution on iPhone 17,16,15, 14, 13
September 20, 2025 - In many cases, a user would like to take a lower-resolution photo with their iPhone. For that, you will have to download a camera resolution settings app from the App Store, which is the best low-resolution camera app. You should have an Apple ID and password to log into the App Store. The above tricks work right now because we don’t have an option to change the iPhone camera resolution.
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SDM Foundation
sdmfoundation.org › home › blog › how to adjust your iphone camera settings
How to Adjust Your iPhone Camera Settings - SDM Foundation
January 15, 2025 - Conversely, choosing a lower quality will reduce your file sizes, but the results may not be what you are looking for. To change the default resolution, click on the top option called “Record Video.”
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Wikihow
wikihow.com › computers and electronics › telephones › smartphones › iphone › iphone applications › how to improve photo resolution on iphone or ipad
How to Improve Photo Resolution on iPhone or iPad
July 16, 2025 - Though there’s no way to adjust ... photo and video resolution on an iPhone or iPad. Go to Settings > Camera > Formats to change your resolution from 12 MP to 24 MP....
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PCMAG
pcmag.com › home › how-to › mobile phones
How to Change the Default Camera Settings on Your iPhone | PCMag
July 22, 2024 - To change your phone's video settings, open Settings > Camera and choose Record Video or Record Slo-mo to change the default video resolution settings. Set video to record 720p at 30fps, 1080p at 30 or 60fps, or 4K at 24, 30, or 60fps.
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iDownloadBlog
idownloadblog.com › home › how to change video resolution from the camera app or settings on iphone
How to change video resolution from the Camera app or Settings on iPhone
April 18, 2024 - For instance, you can set the resolution to 4K and frames per second to 24, but you cannot select HD at 24 fps as the iPhone does not support that. However, you can go with HD resolution at 30 or 60 frames per second. Furthermore, it goes without saying that you can’t change the resolution and frame rate once the recording has started. In addition to changing the video resolution and frame rate from inside the Camera app, you can also pick a default.
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Apple Community
discussions.apple.com › thread › 254887945
Camera is missing from Settings list - Apple Community
So quite recently I've been unable to change my Camera's settings (such as ProRES, resolution and FPS for photos and videos etc.) since the Camera itself is absent in the applications list. I'm currently on iPhone 13 Pro Max with iOS 18.3.1, but that issue has been bothering me since iOS 18 itself was released. Anything I can do to make the Camera appear back in settings? [Re-Titled by Moderator] 1321 1 · Camera Control Preserve Settings not working - iPhone 16 PM All of the camera control preserve settings seem to be enabled and turning them off has no effect.
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Reddit
reddit.com › r/iphone14pro › how to take a higher res photo
How to take a higher res photo : r/iPhone14Pro
October 18, 2022 - The unofficial iPhone 14 Pro and Pro Max community. ... Sorry, this post was deleted by the person who originally posted it. Share ... The phone is only capable of 48mp instead of 50mp, you can choose 48mp in setting > camera > format > turn on · ProRAW, set resolution to 48mp.
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SimplyMac
simplymac.com › iphone › iphone-camera-settings-tutorial
iPhone Camera Settings Tutorial - SimplyMac
September 21, 2024 - Use Pro mode for more creative control. Restart your iPhone first. If issues persist, check for iOS updates or reset your camera settings. Consult Apple Support if problems are not resolved by these steps.
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Apple Community
discussions.apple.com › thread › 255967592
Câmera / Reduction in Resolution in Portr… - Apple Community
I've tried rebooting the apps and phone, and do not believe a re-installation of iOS will make a difference. 1322 1 ... Thanks for sharing additional photos. Your wall charger looked better than my shot of a ceiling. 😀 · In portrait mode press the small arrow at top middle of screen. Look down and you should see 16:9 in a circle. Tap and release 16:9 button and select 4:3, the native camera aspect ratio. ... What is the resolution of the 14 PM in 16:9? Just do the math. Look at your iPhone images above and resolution is 2268 X 4032 = 9,144,576.
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Apple
support.apple.com › en-ca › guide › iphone › iphc1827d32f › ios
Change video recording settings on iPhone - Apple Support (CA)
Learn how to change the camera’s video recording settings on your iPhone, like resolution, frame rate, and more.
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iSunshare
isunshare.com › iphone-ipad › how-to-manage-iphone-camera-settings.html
iOS 18: 9 Tips to Manage Your iPhone Camera Settings for Best Quality
To take the high-quality videos, you can adjust the resolution and frame rate for iPhone video recording. Step 1: Open Settings and hit Camera. Step 2: Click the Record Video option and you will get the following video format: ... Step 3: Choose the one that your iPhone supports. After that, when you record the video, this format will be displayed at the top of the screen. Notes: Higher resolutions (like 4K) result in better quality but also consume more storage.