The Samsung Galaxy S24 Wallpaper size (1080×2340px)
1080x2340 pixels is the native FHD+ resolution of the standard Samsung Galaxy S24, a 9:19.5 Dynamic AMOLED display. A wallpaper at this exact size fills the panel edge to edge with no upscaling, so it stays crisp behind the lock-screen clock and the home-screen icons on Samsung's vivid AMOLED screen.
The tall 19.5:9 aspect ratio means wallpapers built for shorter or differently shaped phones tend to crop or zoom when applied. Resizing to a native 1080x2340 gives One UI exactly the vertical canvas it expects, so your composition keeps its proportions and the parts you care about are not shifted off-screen by the automatic fit.
Plan for the Samsung interface: the lock screen shows a clock and date in the upper area, and the home screen fills the lower portion with app icons, widgets, and the dock. Because AMOLED renders deep blacks and punchy color, high-contrast images look especially good here, but a calmer background keeps icons and widgets readable. 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 frame. Samsung can change screen specs, so verify before exporting.