Great for curated collections of high-contrast Earth images and "Earth at Night" shots.
The ultimate source for authentic images like the "Blue Marble." While they don't always offer a "wallpaper" download button, their high-res TIFF and JPEG files are often massive enough to crop perfectly to 3840x2400. Popular Styles 3840x2400 4K Earth Wallpapers - Top Free 4K Ear...
Clean, flat designs or 3D-rendered planets for a more modern, distraction-free desktop. Great for curated collections of high-contrast Earth images
Detailed shots of continents, oceans, and weather patterns. distraction-free desktop. Detailed shots of continents
Features ultra-high-definition space shots that are often available in several aspect ratios, including 16:10.
One of the best sources for specifically searching by 3840x2400 resolution. They offer both realistic satellite views and stylized digital art.