Video shot or cropped at 9:16 aspect ratio, optimized for phone-held viewing on Reels, Shorts, TikTok, and Stories.
Vertical video matches the way phones are held — portrait orientation, 9:16 aspect ratio. Reels, Shorts, TikTok, and Stories are all vertical-first feeds. Cross-posting a horizontal 16:9 video to a vertical feed produces a small letterboxed clip surrounded by black bars, which the algorithm reads as low-effort and downranks.
The practical resolution is 1080×1920 pixels. Captions sit in the middle third (Reels/TikTok UI eats the top and bottom thirds). Faces and key visual elements should sit between 30% and 70% of vertical height to survive UI crops.
Kompozy renders every short-form output at 1080×1920 by default. The HyperFrames templates are designed around a 9:16 safe zone — the avatar, captions, and overlay graphics all sit within the UI-safe middle band.