Which Kling 3.0, Seedance 2.0 and Wan 3.0 ratios count as a Short?

YouTube decides what a Short is from the file, not from a toggle. Its help page on three-minute Shorts says videos up to three minutes with a square or vertical aspect ratio qualify, for standard channels from October 15, 2024 (read 2026-10-04). To avoid Short classification, the page says to use a wider ratio such as 16:9.

So the question for a generated clip is whether its ratio is square or taller than wide. Here is each Sume row checked against that rule. I treat 3:4 as vertical because it is taller than wide; YouTube's wording is "square or vertical".

Ratios per model

The auto and adaptive values on Wan 3.0 follow the input rather than naming a shape, so pin a ratio when the result must be a Short.

Length is the other half

The 3-minute ceiling is on the final video, not the clip. A single kling-3 or seedance-2 clip tops out at 15 seconds and a wan-3.0 clip at 30, per the video generation docs. A 3-minute Short is a join of several clips, which Timeline 1.0 renders at 1080 by 1920 by default, 9:16 and so a Short.

Pick 9:16 unless you have a reason not to. Square and 3:4 qualify, but they occupy less of the screen in the Shorts feed.