Is 16:9 the default frame for AI video?
On four sheets it is: Google Veo, Grok Imagine and Vidu default to 16:9, and SceneMixer starts new projects at 16:9. YouTube calls 16:9 the standard ratio on a computer. From 5 source pages, read 2026-09-25; no maker pays to be listed.
| Source | Figure | Where it applies |
|---|---|---|
| Google Veo | Landscape 16:9 by default, or portrait 9:16 | Veo 3.1, control the aspect ratio |
| Grok Imagine | Seven shapes, from the default 16:9 through 3:2, 4:3 and square 1:1 to 3:4, 2:3 and 9:16 portrait | Aspect ratio table |
| SceneMixer | 16:9 landscape by default, or 9:16 portrait, chosen once per project | Aspect ratio |
| Vidu | 16:9 by default; also 4:3, 1:1, 3:4 and 9:16, with the 4:3 pair on q2 and q3 models only | Text to video, aspect_ratio parameter |
| YouTube upload encoding settings | 16:9 is the standard aspect ratio on a computer; the player adapts to other shapes | Video resolution and aspect ratio |
Inclusion rule. Vendor pages and references whose printed figures bear on this delivery target. Order. Alphabetical by source name.
1As printed
Veo 3.1 lets you create landscape ( 16:9 , the default setting) or portrait ( 9:16 ) videos.
Google AI for Developers, Veo 3.1 in the Gemini API
Defaults to 16:9 , accepted: 16:9 9:16 3:4 4:3 1:1
Vidu API docs, text to video
A new project starts as 16:9 landscape .
SceneMixer, what comes out (video specs guide)
2What it means for delivery
A default matters because it is what a writer gets without choosing. For a landscape television master a 16:9 default saves a setting; for a vertical feed it is the one to change.
No figure on aspect ratios from 10 vendors: Crreo, DomoAI, Flixly, HeyGen, Higgsfield, Kling AI, M Studio, MagicLight, Pika and Runway.
- Veo 3.1Landscape 16:9 by default, or portrait 9:16control the aspect ratio
- Text to video16:9 by default; also 4:3, 1:1, 3:4 and 9:16, with the 4:3 pair on q2 and q3 models onlyaspect_ratio parameter
- Aspect ratio16:9 landscape by default, or 9:16 portrait, chosen once per project
- Aspect ratio tableSeven shapes, from the default 16:9 through 3:2, 4:3 and square 1:1 to 3:4, 2:3 and 9:16 portrait
- Video resolution and aspect ratio16:9 is the standard aspect ratio on a computer; the player adapts to other shapes