Does Wallper work with external displays?

Yes. External monitors are fully supported.

Wallper works with external displays, including high-resolution and Retina monitors.

You can apply wallpapers to each connected display.

FAQ

Where can I download 4K wallpapers for Mac?
You can browse and download high-quality 4K wallpapers directly from this page. All wallpapers are optimized for macOS displays, including Retina screens.
Are these wallpapers free to download?
Yes, you can download wallpapers for free and use them on your Mac.
Can I use these wallpapers as live wallpapers on Mac?
macOS doesn’t support live wallpapers by default. To use video wallpapers, you need an app like Wallper.
How do I set a video wallpaper on Mac?
You can’t set video wallpapers using macOS alone. Apps like Wallper allow you to apply video wallpapers to your desktop and lock screen.
What resolution are these wallpapers?
Most wallpapers are available in high resolution, including Full HD and 4K, so they look sharp on all Mac displays.