What aspect ratio should a 360° equirectangular photo use?
Most full spherical 360° photos use a 2:1 aspect ratio (width = 2 × height). Common exports include 4096×2048 for fast mobile preview, 6000×3000 for balanced detail, and 7680×3840 (8K) for professional real-estate tours. If width is not close to 2× height, the viewer may still load the file but the scene can look distorted.