What size is a dual monitor wallpaper?

For two 1080p screens, 3840x1080. For two 1440p screens, 5120x1440. That is both screens' widths added together at the shared height.

Why is my wallpaper duplicated on both monitors?

The fit is set to fill each screen instead of spanning. On Windows, choose the "Span" fit so one wide image stretches across both.

How do I stop the bezel from cutting my subject?

Keep the main subject off the centerline of a spanned image, or use two separate matched wallpapers so nothing crosses the gap.

Tutorial · 5 min

How to Make Dual Monitor Wallpapers

There are two ways to do dual monitor wallpapers: one wide image that stretches across both screens, or two separate images, one per monitor. Each needs a different size and a slightly different approach. Picking the wrong one is why a panorama ends up duplicated on both screens instead of spanning them.

This guide covers the exact sizes for both methods, how to keep the seam between monitors from cutting through your subject, and how to set a spanned wallpaper on Windows and macOS.

Method 1: one wide image across both screens

For two side-by-side 1080p monitors, you need a single 3840x1080 image (two 1920x1080 screens joined). For two 1440p monitors it is 5120x1440. Generate in a very wide ratio and keep the main subject away from the exact center, because the bezel gap between monitors sits right there and would slice through it.

Method 2: two matched wallpapers

If spanning feels awkward, make two separate 16:9 wallpapers that share a palette and theme. Use the same color words in both prompts so they feel like a pair. This avoids the bezel-seam problem entirely and lets each monitor have its own focal point.

Account for the bezel gap

The plastic edges between monitors swallow a strip of the image. For a spanned panorama, keep horizons and key subjects off the centerline. A wide landscape like "panoramic mountain range, calm sky, subjects spread left and right" handles the gap well because nothing critical sits dead center.

Setting it up on Windows and macOS

On Windows, right-click the desktop, open Personalization, choose the wide image, and set the fit to "Span." On macOS, open System Settings, Wallpaper, and assign images per display; macOS does not span one image as cleanly, so the two-matched-wallpapers method often works better there.

WallGen

Frequently asked questions

What size is a dual monitor wallpaper?: For two 1080p screens, 3840x1080. For two 1440p screens, 5120x1440. That is both screens' widths added together at the shared height.
Why is my wallpaper duplicated on both monitors?: The fit is set to fill each screen instead of spanning. On Windows, choose the "Span" fit so one wide image stretches across both.
How do I stop the bezel from cutting my subject?: Keep the main subject off the centerline of a spanned image, or use two separate matched wallpapers so nothing crosses the gap.