Peacock vertical video ads in 2026: what to prepare before specs land

Peacock has not published vertical ad specs that I could find, so the honest answer is to prepare a 9:16 master now and fit it to the numbers when NBCUniversal releases them. A 1080x1920 MP4 is Sume's default timeline output, so the master costs $0.10 per output minute, rounded up, and can be re-fitted later.

NBCUniversal's announcement (read 2026-10-04) says: "In 2026, Peacock's vertical video format will become available to advertisers." It describes the format as shortform highlights, previews and exclusive clips inside Peacock's mobile app. The page gives no length, resolution, file size or loudness figures.

What is known and what is not?

Keep a clear line between the vendor's statement and your own assumptions, so nobody renders to a number that does not exist.

How do I build a master that can be re-cut?

Make the 9:16 version first, since an app-based vertical format is the likeliest shape. Generate or edit the footage at 1080x1920, keep key action in the center band, and leave the top and bottom clear of text so a later crop or UI overlay does not hide it. Timeline's fit modes (cover, contain, stretch, blur) let you drop the same footage into other frames without regenerating.

Models differ in which ratios they offer. Sume's Videos API lists 16:9, 9:16, 1:1, 4:3, 3:4, 3:2, 2:3, 21:9 and 9:21 across the catalog, and each model reports its own subset in supported_aspect_ratios, so confirm 9:16 before you pick one.

What about the horizontal Peacock ads you already run?

Nothing in the announcement changes them. Streaming ad specs differ by buyer and by platform, so check what your Peacock sales contact sends. The stored post on Hulu ad specs shows how a different streamer documents its numbers; Hulu has its own rules, so do not reuse them for Peacock.

When should I spend money?

Wait for the spec. Until then, build the creative idea and the 9:16 master, which are reusable anywhere. The post on cutting 9:16, 1:1 and 16:9 from one master shows the export side, and it will take minutes once Peacock's numbers are public.