The lock screen and the home screen are two different files
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diagramThe iPhone lock screen wallpaper is a separate slot from the home screen wallpaper, holding its own image at the phone's native pixel size, which is 1179 x 2556 on a 6.1 in iPhone and 1290 x 2796 on a 6.7 or 6.9 in Max.
Two slots, two files, two different sets of things covering them. That is the answer to why a picture that looks right when you unlock the phone loses its subject's face the moment the screen locks, and it is the answer to whether the two can differ: they can, because they were never one setting.
Lock screen against home screen, and what covers each
The lock screen and the home screen are two wallpaper slots on the same panel, so the pixel size is identical and everything else about them differs. The lock screen gives up its top band to the clock and its bottom corners to the flashlight and camera buttons. The home screen gives up most of its surface to app icons, widgets and the dock.
| Slot | Pixel size | What covers the image | Where the subject belongs |
|---|---|---|---|
| Lock Screen | 1179 x 2556 or 1290 x 2796 | Clock at the top, flashlight and camera at the bottom corners, notifications in the lower half | The middle band, clear of the top third |
| Home Screen | Identical to the lock screen | App icons across the grid, widgets, the dock | Anywhere, since detail is obscured either way |
The comparison people are making when they ask about lock screen versus wallpaper is this one. The word wallpaper covers both slots on an iPhone, and the lock screen is the slot with rules.
Setting a different picture on each slot
To put two different pictures on the two slots, set the lock screen first and customize the home screen afterward, because iOS offers to fill both at once and most people accept without noticing.
- Press and hold an empty area of the lock screen until the wallpaper gallery appears.
- Tap the plus control to add a new lock screen, then choose a photo.
- Position the image, since the crop you set here is the one the clock sits on.
- Confirm, and when iOS offers the picture as a pair, choose to customize the home screen instead.
- Pick a different photo, a solid color or a gradient for the home screen.
Setting a picture from the Photos app reaches the same place from the other direction: iOS offers a wallpaper pair, which fills both slots with one image, or a separately customized home screen. Choosing the pair is what makes two slots look like one setting.
The safe area, and how much of the frame it takes
The safe area on an iPhone lock screen is the middle band of the picture, and it is the only part reliably visible in ordinary use. The clock occupies the top at a size that changes with the style you pick, notifications stack upward from the lower third, and the flashlight and camera buttons sit permanently in the bottom corners. On a 1179 x 2556 panel that leaves a usable strip far shorter than the file is tall.
WHY THE SAME FILE FAILS TWICE
The two slots hide different regions. The home screen hides the middle behind icons and leaves the top clear; the lock screen does the opposite. A file that works in both keeps its subject in the vertical middle and nothing important at the very top or the very bottom.
Depth Effect, and the pictures it refuses
Depth Effect pushes the clock behind a foreground subject, and it will not engage on every image. iOS looks for a clear foreground to separate from the background, so a photograph of a person against a distinct backdrop usually works and a flat illustrated scene usually does not. Illustration is the hard case, since a drawn character and a drawn background often occupy the same visual plane with no depth cue to find.
When it does engage it changes the crop question, because the clock moves behind the subject and a head is now allowed to sit higher in the frame. The effect can also push the image up or in to make room, cutting the detail you just positioned, so check the result before confirming rather than after.
What a lock screen carousel is
A lock screen carousel is a feature that rotates the lock screen image automatically through a supplied set of pictures instead of holding one. The term travels between platforms and across languages, which is why the phrase turns up as a question on its own, and the meaning does not change: the phone, not the owner, is choosing today's picture.
- On an iPhone the equivalent is a Photo Shuffle lock screen, cycling through photos you select.
- On Android it is usually a launcher or vendor feature, delivering images from a service.
- On either platform it is a setting rather than a fault, so it can be turned off.
A carousel is not a live wallpaper. A live wallpaper is a video your device never stops decoding while it is visible; a carousel swaps one still for another on a timer and costs nothing between swaps. The real objection to a carousel is that pictures cropped for nothing in particular keep putting faces under the clock.
The iPad and the Mac answer this differently
An iPad works like an iPhone and a Mac does not. iPadOS carries the same two slots, so lock screen and home screen can differ there too, at the iPad's own pixel size: an iPad Pro 11 in is 1668 x 2388 and an iPad Pro 12.9 or 13 in is 2048 x 2732. Reusing a 1290 x 2796 phone file on a tablet gives an upscale in one direction and a heavy crop in the other, because the shapes are not the same.
macOS is the different case. Its Wallpaper pane sets one picture per display and offers no second picker for a lock screen image, so the two slot arrangement is not there to configure, and macOS does not span one picture across two displays either. Wallpaper Engine is a Steam program that plays animated wallpapers, and it is Windows only, so it does not fill the gap. The same picture is a different file on every device you own.
Every screen wants one pair of numbers, and for this job the pair is your phone's native pixels with the subject in the middle band. Check the license before you crop: cropping and resizing are derivative acts, so a Creative Commons ND license does not permit fitting an image to a phone at all, and anime artwork stays copyrighted however easy a copy was to find.