The iPhone 13 mini Wallpaper size (1080×2340px)
1080x2340 pixels is the native resolution of the iPhone 13 mini, shared with the iPhone 12 mini. The mini keeps the same tall 9:19.5 aspect ratio as its full-size siblings but in a smaller, denser package, so a wallpaper at this exact size fills the compact Super Retina screen edge to edge with no upscaling.
Even though the mini shares the modern 19.5:9 shape, its resolution differs from the larger iPhones, so a wallpaper sized for a 14 or 15 Pro is not a pixel match. Resizing to a native 1080x2340 gives the mini exactly the canvas it needs, keeping proportions correct and your composition intact rather than slightly zoomed or shifted by the automatic fit.
Because the screen is physically small, simple, bold compositions read better than intricate detail that gets lost at this size. Plan for the iOS layout: the lock screen shows a large clock in the upper-middle, and the home screen fills its lower two-thirds with app icons and the dock, which occupy a proportionally larger share of the tiny display. Keep faces and focal points in the central band below the clock. 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 mini frame. Apple can change specs, so verify before exporting.