1
Choose the best original
Open the photo in Photos and look for the least compressed version. An original camera image usually gives the tool more useful information than a screenshot, a social-media download, or a tiny image sent through a chat app. Keep the unedited original so you can compare it later.
2
Upload and enlarge
In your iPhone browser, select the image from your photo library and run the upscale. AI estimates plausible detail while increasing pixel dimensions; it does not recover a perfect record of information that the camera never captured. If the service offers settings, begin conservatively rather than pushing for the largest possible output.
3
Inspect before saving
Compare the result with the original at a similar zoom level. Check eyes, hair, lettering, straight edges, and textured surfaces for strange patterns or invented detail. Save the enhanced version only if it looks better at the size where you actually intend to use it.