One 180-second vertical master: which ad placements take it

Short answer

A 180-second 9:16 video is accepted as an organic YouTube Short, as a TikTok non-Spark ad, as an Instagram Reels ad, an Instagram Feed ad and a Facebook Feed ad, according to each platform's own page read 2026-10-09. It does not suit a YouTube Shorts ad (Google recommends under 60 seconds), a bumper (6 seconds), or a skippable in-stream ad if you want to meet Google's recommendation of under 3 minutes, because 180 seconds is not under 3 minutes.

Building the master on Sume

Timeline 1.0 renders up to 1,800 seconds in one MP4 at a default of 1080x1920, which already matches the Instagram Feed and YouTube Short geometry and clears TikTok's 540x960 minimum. A 180-second render is ceil(3) x $0.10 = $0.30 at the public rate.

The Reels recommendation does not fit: 1440x2560 has a height of 2,560, and Timeline's output height is limited to even integers from 256 to 2160. A 1080x1920 file still meets Reels' 9:16 ratio and the 500-pixel minimum width, but it is below Meta's recommended resolution; that is your call on quality.

Shorter cutdowns

For the placements that reject 180 seconds, cut from the master with video trim. Each trim is $0.02 and returns a new MP4, so the 59-second Shorts-ad cut and the 6-second bumper cut are $0.04 together. Use precision: exact for a frame-accurate cut, since keyframe mode can start up to one GOP early.

• Master render: 3 billed minutes = $0.30.
• Shorts ad cut at 59 s: one trim, $0.02.
• Bumper cut at 6 s: one trim, $0.02.
• Total for the master plus two cutdowns: $0.34.

The copyright rule matters here

The only placement in the table where the 180-second length creates an extra risk is the organic Short: YouTube says a Short over one minute with an active copyright claim of any type is blocked globally and not monetizable. If your master carries licensed music, that is the place to check first.