Google Ads allows ratios between 16:9 and 9:16: Sume models for 3:4

Google Ads allows any aspect ratio between 16:9 and 9:16, and it names three as recommended: 16:9, 1:1 and 9:16. Seedance (all four models), Wan 3.0 and both MiniMax H3 models can render the in-between ratios 4:3 and 3:4 on Sume. Kling 3 lists only 16:9, 9:16 and 1:1, and Gemini Omni Flash only 16:9 and 9:16.

What Google Ads says

The Google Ads Help page on video asset specifications for Video and App campaigns recommends horizontal 16:9, square 1:1 and vertical 9:16. It then states: "Aspect ratios between these settings are allowed. On the YouTube app, the video player will automatically adjust to ratios between 16:9 and 9:16."

The same page warns that campaigns may not serve if they only have vertical videos, because vertical assets no longer serve in YouTube in-feed environments such as the homepage feed, Search results feed and Watch Next feed. A 3:4 or 1:1 asset is not vertical 9:16, so it is one way to avoid a vertical-only set without producing a separate 16:9 version.

Which ratios are in range

Width divided by height for 16:9 is 1.78 and for 9:16 is 0.56. Any ratio with a value between those two is in the allowed band. 4:3 is 1.33, 1:1 is 1.00 and 3:4 is 0.75, so all three are inside it. 21:9 is 2.33, which is wider than 16:9, and falls outside the band on Google's wording.

Seedance has fixed sizes for each ratio and resolution, so the in-between formats come with known pixel counts.

Which Sume models take which ratio

These lists come from the Sume video catalog. Always confirm in GET /v1/videos/models before a batch, because limits differ per model.

• Seedance 2.5, 2.0, Fast and Mini: 21:9, 16:9, 4:3, 1:1, 3:4 and 9:16, plus auto and adaptive on 2.5.
• Wan 3.0: 16:9, 4:3, 1:1, 3:4 and 9:16, plus auto and adaptive.
• MiniMax H3 and H3 Max: 21:9, 16:9, 4:3, 1:1, 3:4 and 9:16, plus adaptive.
• Kling 3: 16:9, 9:16 and 1:1 only.
• Gemini Omni Flash 1.1: 16:9 and 9:16 only.

A practical use of the band

Take a campaign that has a 16:9 video and a 9:16 video. Add a 3:4 clip at 720p on Seedance 2.0 for 15 seconds. 834x1112 is 927,408 pixels against 921,600 for 720x1280, so the token count is 326,042 against 324,000, and the Sume price is $5.71 against $5.67 for the 9:16 version. A 1:1 clip at 960x960 has exactly the 9:16 pixel count and costs $5.67.

So the ratio barely moves the cost on Seedance at 720p. The tier and the length move it far more.

What to check

• The page does not say that every placement serves every in-between ratio, only that the ratios are allowed and that the YouTube app player adjusts between 16:9 and 9:16.
• The page does not list a length or file size. Use Google's other pages for those.
• Do not choose 3:4 for a model that does not list it; check each model's supported_aspect_ratios first.