Correction, 2026-10-01: the table gave Kling as making 16:9, 9:16 and 1:1 from text. That holds for Kling 2.6 Pro, not for Kling v3, the model the Kling tool opens on: on 8frame, Kling v3 Standard and Pro need a start image and follow its shape. The table and the FAQ now split the two.
Correction, 2026-09-30: the first version missed two models: Pruna p-video, which offers the same seven shapes as Grok Imagine, and Creatify Boreal. Both are in the table below.
Every video model on 8frame can make vertical 9:16 and horizontal 16:9. Beyond those two, they differ a lot: Veo 3.1 and Gemini Omni Flash offer only 16:9 and 9:16, Grok Imagine and Pruna p-video offer seven shapes including 2:3 and 3:2, Hailuo H3 and Runway Gen-4 Turbo add ultra-wide 21:9, and Seedance can follow the shape of your start image. None of them generates 4:5, the shape Meta recommends for feed ads. These are the options 8frame offers for each model, read from its own settings.
TL;DR
- Everyone: 16:9 and 9:16.
- Most shapes: Grok Imagine and Pruna p-video (16:9, 4:3, 3:2, 1:1, 2:3, 3:4, 9:16).
- Ultra-wide 21:9: Hailuo H3 and Runway Gen-4 Turbo.
- Only two shapes: Veo 3.1 (all tiers) and Gemini Omni Flash.
- Follows the start image: Seedance ("Auto" option), and Wan, Kling and Hailuo H3 whenever you start from an image.
- 4:5: no model. Generate 3:4 or 9:16 and crop.
Every model, one table
| Model on 8frame | Aspect ratios offered |
|---|---|
| Veo 3.1, Fast, Lite | 16:9, 9:16 |
| Gemini Omni Flash | 16:9, 9:16 |
| Kling v3 (Standard, Pro) | the start image's shape; a start image is required |
| Kling 2.6 Pro | 16:9, 9:16, 1:1 from text; the start image's shape from an image |
| Wan 3.0, Wan 3.0 Prime (and older Wan) | 16:9, 9:16, 1:1 from text; the start image's shape from an image |
| Seedance 2.5, 2.0 | Auto, 16:9, 9:16, 1:1, 4:3, 3:4 |
| Happy Horse | 16:9, 9:16, 1:1, 4:3, 3:4 |
| Hailuo H3 | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 (text to video; from an image it follows the image) |
| Grok Imagine | 16:9, 4:3, 3:2, 1:1, 2:3, 3:4, 9:16 |
| Pruna p-video | 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 1:1 from text; with a start image the model ignores the setting |
| Creatify Boreal | 16:9, 9:16, 1:1, 4:3, 3:4; a reference image overrides the setting |
| Runway Gen-4 Turbo | 16:9, 9:16, 1:1, 4:3, 3:4, 21:9 |
Veo 3.1 crops a start image that is not 16:9 or 9:16 to fit, per its provider's documentation; see Veo 3.1 start image requirements.
Shapes you cannot generate, and how to get them
| Shape you need | Where it is used | Generate | Then |
|---|---|---|---|
| 4:5 | Instagram and Facebook feed ads | 3:4 | Crop a little off the top and bottom |
| 2:3 | 2:3 on Grok Imagine or Pruna p-video, or 3:4 elsewhere | Crop 3:4 slightly if needed | |
| 1.91:1 | Link previews, some feed placements | 16:9 | Crop slightly top and bottom |
| 21:9 | Cinematic letterbox | 21:9 on Hailuo H3 or Runway | Or crop 16:9 |
Cropping costs resolution, so start from the highest resolution the model offers for the final version. Placement requirements are collected in the platform pages: Instagram feed and Stories, Instagram Reels, TikTok, LinkedIn and Pinterest.
One generation, several placements
If one clip has to serve Reels, Stories and the feed, generate 9:16 with the subject centred and headroom above it. That frame crops to 4:5 and 1:1 without losing the subject. A subject placed near the top or bottom edge survives only one of the crops.
For when to choose which shape in the first place, see the AI video aspect ratio guide.
FAQ
Which AI video models support 9:16? All of the video models on 8frame. On Kling, 9:16 from text is a Kling 2.6 Pro setting; Kling v3 needs a start image and follows its shape, so start from a vertical image.
Which AI video models support 21:9? Hailuo H3 (text to video) and Runway Gen-4 Turbo.
What aspect ratios does Veo 3.1 support? 16:9 and 9:16, on all three tiers.
Can AI video models generate 4:5? Not on 8frame. Generate 3:4 and crop slightly, or crop from 9:16.
What does "Auto" mean on Seedance? The output follows the shape of the start image instead of a fixed ratio. Wan, Kling and Hailuo H3 do the same automatically whenever you give them a start image.
Sources
- Aspect ratio options per model: the 8frame app, checked 2026-09-30
- Kling v3 start-image requirement: the 8frame app, checked 2026-10-01
Pick the shape before you generate; crop only for the placements that need it. The 8frame canvas is free and unlimited; generation is paid from $19/month.