The Galaxy Tab S9 Wallpaper size (1600×2560px)
1600x2560 pixels is the native portrait resolution of the Samsung Galaxy Tab S9, a roughly 5:8 (10:16) Dynamic AMOLED display. A wallpaper at this exact size fills the panel edge to edge with no upscaling, letting the Tab S9's vivid AMOLED screen show deep blacks and rich color the way it is designed to, behind One UI's lock and home screens.
The 5:8 tablet ratio is taller and narrower than an iPad's 3:4 but far boxier than a phone, and like all tablets the Tab S9 rotates, so the wallpaper must work in both portrait and landscape. That mix is why phone, iPad, and desktop wallpapers do not fit it well; resizing to a native 1600x2560 gives One UI exactly the portrait canvas it expects with no distortion.
Because the AMOLED panel is large and sharp, use a good high-resolution source at or above 1600x2560 so detail holds up when scaled to the tablet, and lean on high-contrast imagery that pops on AMOLED. Plan for the interface: the lock screen shows a clock in the upper area, and the home screen arranges app icons, widgets, and the dock, often used alongside the S Pen and DeX multitasking. Keep the focal point centered so it survives rotation and reads behind icons. This tool resizes entirely in your browser, so your file is never uploaded, it is free, and your original quality is preserved while the image is fit to the 5:8 frame. Samsung can change specs, so verify before exporting.