Correction, 2026-10-02: this page listed Wan 3.0 among the models that make 3:4; from text the Wan tool offers 16:9, 9:16 and 1:1 only.
Correction, 2026-10-01: the settings table gave Kling v3 as making 16:9, 9:16 or 1:1 from text. On 8frame, Kling v3 needs a start image and follows its shape; the Kling model that works from text alone is Kling 2.6 Pro, now its own row.
Pinterest's business help center lists these requirements for standard video ads: MP4, MOV or M4V, up to 2 GB, at least 4 seconds and at most 15 minutes (6 to 15 seconds recommended), and an aspect ratio between 1:2 and 1.91:1, with square or vertical (2:3, 4:5 or 9:16) recommended. Two AI video habits break these: very short clips, since several models generate 3 seconds or less, and ultra-wide 21:9 output, which is wider than 1.91:1.
TL;DR
| Spec | Pinterest standard video ads |
|---|---|
| Formats | .MP4, .MOV or .M4V |
| File size | up to 2 GB |
| Length | 4 s to 15 min; 6 to 15 s recommended |
| Aspect ratio | shorter than 1:2, taller than 1.91:1 |
| Recommended shapes | 1:1, 2:3, 4:5, 9:16 |
From Pinterest Business help, "Review ad specs", checked 2026-09-29.
The AI clips that fail
Anything under 4 seconds. On 8frame, Grok Imagine goes down to 1 second, and Kling v3, Kling O3, Happy Horse and Gemini Omni Flash start at 3. A 3-second clip on its own is too short for a Pinterest ad; generate 4 seconds or more, or join short clips. Per-model lengths are in clip length limits by model.
21:9. Hailuo H3 offers 21:9, which is 2.33:1, wider than Pinterest's 1.91:1 limit. Use 16:9 or narrower for Pinterest, and preferably a vertical shape.
Very tall shapes are fine up to 1:2. 9:16 (0.56:1) is inside the range, which covers every vertical option the video models on 8frame offer.
Which settings fit
| Model on 8frame | Shapes offered | Pinterest-friendly choice |
|---|---|---|
| Wan 3.0 | 16:9, 9:16, 1:1 | 9:16 or 1:1, 4 s or longer |
| Seedance 2.5 | 16:9, 9:16, 1:1, 4:3, 3:4 | 9:16 or 1:1 |
| Hailuo H3 | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 | Anything but 21:9 |
| Kling v3 | The start image's shape (a start image is required) | A 9:16 or 1:1 still, 4 s or longer |
| Kling 2.6 Pro | 16:9, 9:16 or 1:1 from text | 9:16 or 1:1, 5 or 10 s |
| Veo 3.1 | 16:9 or 9:16 | 9:16 |
Pinterest recommends 2:3 and 4:5, which the video models do not generate directly. Generate 9:16 or 3:4 and crop in the edit if you want those shapes.
Length that works
Pinterest recommends 6 to 15 seconds for video ads. One generation covers that on most models: Wan 3.0 and Seedance 2.5 go to 30 seconds, Kling v3 and Hailuo H3 to 15, Veo 3.1 to 8. For choosing models, see best AI video for Pinterest.
FAQ
What are Pinterest's video ad specs? MP4, MOV or M4V, up to 2 GB, 4 seconds to 15 minutes, aspect ratio between 1:2 and 1.91:1, per Pinterest Business help.
What is the minimum length of a Pinterest video ad? 4 seconds. 6 to 15 seconds is recommended.
What aspect ratio should a Pinterest video be? Square (1:1) or vertical (2:3, 4:5 or 9:16) are recommended. Anything wider than 1.91:1, such as 21:9, is outside the allowed range.
Can I upload a 3-second AI clip as a Pinterest ad? No. The minimum is 4 seconds.
Sources
- Pinterest Business help, "Review ad specs": file types, up to 2 GB, 4 seconds to 15 minutes, 6 to 15 seconds recommended, aspect ratio between 1:2 and 1.91:1, recommended square or vertical: help.pinterest.com/en/business/article/pinterest-product-specs, fetched 2026-09-29
- 8frame clip lengths and aspect ratios: the 8frame app, checked 2026-09-29
- Kling v3 start-image requirement: the 8frame app, checked 2026-10-01
Four seconds or more, vertical, nothing wider than 1.91:1. The 8frame canvas is free and unlimited; generation is paid from $19/month.