How to Choose the Right Aspect Ratio for AI Video
Aspect ratio decides where your video looks native. This guide explains which ratio to pick for each platform when generating AI video on forvideo.ai.
The main ratios
- 16:9 - YouTube, landscape web, presentations.
- 9:16 - TikTok, Reels, Shorts - full-screen vertical.
- 1:1 - square feed posts.
- 4:3 / 3:4 - classic and portrait framing.
- 2:3 / 3:2 - photo-style framing.
Match the ratio to the platform
Shoot vertical for phone-first platforms and landscape for YouTube. Cropping a 16:9 clip to 9:16 later loses resolution and framing, so generate in the target ratio from the start.
Models and ratios
Most models on the platform support the common ratios. Sulphur 2, for example, covers 1:1, 2:3, 3:2, 3:4, 4:3, 9:16 and 16:9 - so you can produce phone-native and desktop-native clips from one workflow.
Composition tips
In 9:16 keep the subject centered and leave headroom for captions. In 16:9 use the rule of thirds and let the environment breathe.
Next steps
See how to make vertical 9:16 videos and the best AI video tools for TikTok.