The iPhone 16 Pro Max Wallpaper size (1320×2868px)
1320x2868 pixels is the native screen resolution of the iPhone 16 Pro Max, a tall 9:19.5 display that is the largest in the iPhone lineup. A wallpaper at this exact size fills the Super Retina XDR panel edge to edge with no upscaling, so fine detail and gradients stay crisp behind your app icons and on the lock screen.
The 19.5:9-tall aspect ratio is very different from the near-square shapes of older phones, which is why a wallpaper made for another device often ends up zoomed or off-center here. Resizing to a native 1320x2868 gives iOS exactly the vertical canvas it expects, so your image is not stretched and the parts you care about stay where you placed them.
The big thing to plan around is the iOS interface. The lock screen puts a large clock across the upper-middle and time and date near the top, while the home screen fills the lower two-thirds with app icons and the dock. For a lock-screen wallpaper, keep faces and key detail in the central band below the clock; for a home-screen wallpaper, expect icons to cover most of the image. This tool resizes entirely in your browser, so your photo is never uploaded, it is free, and your original quality is preserved while the file is fit to the 9:19.5 iPhone frame. Apple can change screen specs, so verify before exporting.