Duo ThemesDuo Themes / Guides / iPhone Duo wallpaper looks cropped, zoomed or blurry — how to fix it
iPhone Duo wallpaper looks cropped, zoomed or blurry — how to fix it
Updated: September 24, 2026
Written before general availability. The display figures on this page come from Apple's published iPhone Duo technical specifications. iPhone Duo goes on sale 23 October 2026; the on-device steps below follow how iOS has worked on existing iPhones, and we will re-check every step against a shipping device and update this page.
You set a wallpaper, and it is not where you put it. Almost always one of three things is happening.
1. The file is the wrong shape
This is the most common cause on iPhone Duo specifically, because the two screens are not the same shape. The cover screen is 1398 × 2034 (ratio 1:1.455) and the inner screen is 1878 × 2670 (ratio 1:1.422).
Use the inner file on the cover screen and it is 46 pixels too short, so iOS zooms until it fits — cropping about 2% off every edge. Use the cover file on the inner screen and it is 62 pixels too tall, so the top and bottom get trimmed.
Fix: use a file made for the screen you are setting. Our wallpaper pairs ship as two files for exactly this reason, and the arithmetic is here.
2. The file is too small
Anything under 1398 pixels wide will be upscaled onto the cover screen, and anything under 1878 wide will be upscaled onto the inner screen. Upscaling a gradient looks soft; upscaling anything with detail looks mushy.
Fix: start from a file at least as large as the screen. Bigger is not better — iOS discards the extra — but smaller is always worse. Images saved from a messaging app are the usual culprit, since most of them recompress and shrink on send.
3. Perspective Zoom is on
Perspective Zoom moves the wallpaper slightly as you tilt the phone, which means iOS has to crop in to have something to move. If your wallpaper looks mysteriously closer than the file you picked, this is why.
Fix: when you add the wallpaper, look for the Perspective Zoom control on the preview screen and turn it off.
Bonus: visible bands of colour
Not a cropping problem, but the other complaint we hear. Smooth gradients show stepped bands on large OLED panels, especially at low brightness, and the 7.6‑inch inner screen is where it shows most. The cause is 8-bit colour quantisation, not your file being low quality.
Fix: add a very small amount of noise — under 1% — across the whole image. It breaks up the steps and is invisible at normal viewing distance. Every wallpaper we publish already has it.
Still not right?
Email us at [email protected] with your iPhone model and iOS version, or read the support page.