Cover vs Inner: How Dual-Screen Wallpapers Work

A folding phone breaks an assumption every other phone relies on: that there is one screen to dress. The iPhone Duo has two panels with two shapes, and a wallpaper has to work on both. That is why the wallpapers on this site ship as a matched Cover and Inner pair rather than a single image. This guide explains what those two files are, how a pair is designed, and how to get the crop right on each screen.

The short version

Cover is the portrait file for the outer screen you see when the phone is closed.
Inner is the landscape file for the large display you see when it is open.
They are the same artwork, exported twice, so the two screens share one look.
The cover file is 1398 × 2034 pixels; the inner file is 2670 × 1878 pixels.
Set them independently in Settings → Wallpaper.

Why the two screens need different files

Take a favourite photograph and set it as a wallpaper on a normal phone. The phone crops it, and you move on. On a folding phone that approach falls apart, because the two screens are almost inverse shapes of one another.

The cover screen is a tall portrait panel. It is narrow and high, roughly in the proportion of a bookmark. The inner display is a wide landscape panel, closer to the shape of a small tablet. Drop a single portrait photo onto the inner display and you get huge empty bands on the left and right, or a heavy crop that throws away most of the frame. Drop a single landscape photo onto the cover screen and the phone slices out a thin vertical strip of the middle, which is usually the least interesting part of the picture.

A matched pair sidesteps all of that. Instead of forcing one file to survive two crops, the wallpaper is composed for each panel so the subject lands where it should be.

How a matched pair is designed

When a dual-screen wallpaper is authored, the designer is really solving three problems at once.

1. One palette, two canvases

The two files must read as the same wallpaper. That means a shared colour story — the same sky gradient, the same range of greens and greys, the same overall light or dark mood. When you unfold the phone, the scene should feel continuous rather than like two unrelated images.

2. A horizon that survives the fold

Most landscape wallpapers carry a horizon line or a dominant band of colour. On the inner display that band can run almost the full width, which reads as calm and wide. The same band, cropped to the cover screen, has to sit at a height where it does not collide with the clock on the lock screen. Good pairs place the subject so it stays visible in both crops.

3. Room for the interface

A wallpaper is a backdrop, not a poster. Icons, widgets and the clock all sit on top of it, so the busiest detail usually belongs away from the top and the centre. Dark wallpapers get an extra benefit here: because OLED screens switch off black pixels, a calm dark wallpaper keeps the status bar legible without needing a heavy shadow behind it.

Portrait versus landscape: getting the crop right

If you are adapting your own photo rather than downloading a finished pair, keep these rules of thumb in mind:

For the cover screen, start from a portrait crop. Aim for a subject that fills the frame vertically, and leave the top third relatively uncluttered for the lock-screen clock.
For the inner display, start from a landscape crop. Keep the main subject near the centre third, since the outer edges feel peripheral on such a wide panel.
Do not recycle the same file for both screens. Even if it technically loads, one of the two crops will look accidental.
Match the mood, not just the pixels. A warm cover and a cold inner (or the reverse) will look like a mistake every time you open the phone.

Should you use Light and Dark as a pair?

A common question is whether the light and dark wallpapers should be treated as one pair. They are two separate sets, not two halves of one. Each set already contains both a cover and an inner file, so the "light" set is complete on its own, and so is the "dark" set. You can, however, set the dark cover and the dark inner as a matched look, and do the same with the light pair — that is exactly what they are made for. You can also assign them to your Light and Dark appearance settings if you want the phone to switch with the system theme.

Setting the pair

Once you have downloaded both files, the process is the same as any wallpaper: open Settings → Wallpaper, choose the cover file for the outer screen and the inner file for the open display, then adjust the crop on each. Our step-by-step guide covers the tap-by-tap flow, including how to keep the two screens looking like one design.

A quick checklist

Decide whether you want the light or the dark look.
Download both files from the wallpaper's page, or take the ZIP for a single download.
Set the portrait cover file on the cover screen.
Set the landscape inner file on the inner display.
Check the lock screen once — the clock should sit over calm space, not over the busiest part of the image.

Where to start

If you would rather see the concept than build it, browse the wallpaper catalog and open any set to preview both panels side by side. The iPhone Duo Light and iPhone Duo Dark sets are the current pairs, and the size guide has the exact dimensions if you want to make your own.