The iPhone 15 and 14 Pro Wallpaper size (1179×2556px)
1179x2556 pixels is the native resolution of the standard iPhone 15 and the iPhone 15 Pro, a size also shared with the iPhone 14 Pro. All use a tall 9:19.5 Super Retina display, and a wallpaper built to this exact size fills the panel edge to edge with no upscaling, so it stays crisp on the lock screen and behind home-screen icons.
Because the 19.5:9 aspect ratio is so tall, wallpapers created for older or differently shaped phones tend to zoom in or crop awkwardly when applied here. Resizing to a native 1179x2556 gives iOS exactly the vertical canvas it expects, keeping your composition intact so the parts you want on screen are not trimmed away by the automatic fit.
Plan for the iOS layout as usual. The lock screen shows a large clock in the upper-middle area with the date above, while the home screen fills its lower two-thirds with app icons and the dock. For lock-screen use, keep faces and focal points in the central band below the clock; for home-screen use, choose an image that stays pleasant behind a grid of icons. This tool resizes entirely in your browser, so your photo is never uploaded, the process is free, and your original quality is preserved while the file is fit to the 9:19.5 iPhone frame. Apple can adjust screen specs, so verify before exporting.