The XGA Wallpaper size (1024×768px)
1024x768 pixels is XGA, the classic 4:3 resolution that defined desktop computing for years and still turns up on older monitors, many projectors, industrial panels, and retro-computing setups. The 4:3 shape is much taller and boxier than modern widescreen, so a 16:9 wallpaper looks wrong here, either bracketed by bars or stretched until proportions distort.
Resizing to a native 1024x768 respects that 4:3 shape and fills an XGA display cleanly. This is especially useful for projectors and presentation screens that still default to 4:3, where a correctly proportioned background looks intentional and undistorted instead of squeezed or letterboxed on the projected image.
Because XGA is a low resolution, there is no advantage to a large source; the display shows only 768 vertical lines, so resizing your photo down to this exact size gives the panel precisely what it can render and keeps everything crisp. The boxier frame favors centered or vertical compositions over wide panoramas. Keep the focal point away from the taskbar and corners. This tool resizes entirely in your browser, so your image is never uploaded, it is free, and your original quality is preserved while the file is fit to the classic 4:3 shape XGA screens use. Older display specs vary, so verify yours before exporting.