This is how to add black bars on your video in Premiere Pro #shorts Letterbox Ratios: 1. 2.35:1 Cinemascope Widescreen - 1080p HD: 1920 by 817 pixels - 3840p UHD: 3840 by 1637 pixels - 4096 C4K: 4096 by 1749 pixels 2. 2.39:1 Anamorphic Widescreen - 1080p HD: 1920 by 800 pixels - 3840p UHD: 3840 by 1593 pixels - 4096 C4K: 4096 by 1716 pixels 3. 1.85:1 Flat Widescreen - 1080p HD: 1920 by 1038 pixels - 3840p UHD: 3840 by 2076 pixels - 4096 C4K: 4096 by 2214 pixels 4. 2:1 Univisium Widescreen - 1080p HD: 1920 by 960 pixels - 3840p UHD: 3840 by 1920 pixels - 4096 C4K: 4096 by 2048 pixels 5. 4:3 Fullscreen - 1080p HD: 1440 by 1080 pixels - 3840p UHD: 2880 by 2160 pixels - 4096 C4K: 4096 by 3072 pixels