# Aspect ratio

> Aspect ratio is the width-to-height proportion of a frame: 16:9 for widescreen and YouTube, 9:16 for vertical shorts, 1:1 for square feeds, 21:9 for cinema. In AI generation it is a parameter on modern engines and a prompt hint on older ones.

Choosing the ratio at generation time matters because a vertical composition is not a cropped horizontal one — the engine frames the subject for the format. Product pages want 16:9, TikTok and Reels 9:16, feeds 1:1.

## On eroq

Video: 16:9, 9:16 and 1:1 — native on Seedance, Kling, Hailuo and Veo, prompt-steered on Motion One. Images: 1:1, 3:4, 4:3, 9:16, 16:9, plus 21:9 in the format picker.

## FAQ

### Can AI video be vertical?

Yes — 9:16 is native on the next-gen engines.

## Related

- https://eroq.ai/use-cases/social-shorts — Shorts
- https://eroq.ai/tools/ai-ad-generator — Ads mode

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