Pinterest video ads: 15 minutes allowed, 6-15 seconds recommended

Ship 6-15 seconds. Pinterest's product specs allow a video ad between 4 seconds and 15 minutes and up to 2 GB, but the same page recommends 6-15 seconds. That recommended band lines up with Sume's video catalog: per the Video Generation docs, every catalog model has a maximum of 15 seconds except the few listed with longer limits (for example seedance-2.5 at 4-30 s and wan-3.0 at 2-30 s). Check supported_durations for the model you pick.

Pinterest's numbers

Values from Pinterest's product specs page.

Match the length to the model

The Video Generation docs say limits differ per model and to read supported_resolutions, supported_aspect_ratios and supported_durations from GET /v1/videos/models before you submit. The example model entry lists aspect ratios 21:9, 16:9, 4:3, 1:1, 3:4 and 9:16, with durations from 4 to 15 s.

Of Pinterest's allowed ratios, 1:1 and 9:16 appear in that example list. 2:3 and 4:5 do not, so for those, generate at a listed ratio and decide on a crop or fit, or check your chosen model's list for what it really supports.

The 4 s floor on Pinterest is also the shortest duration in the example entry.

When to go longer

Longer than 15 s is allowed up to 15 minutes, but the page recommends the short band, so a longer cut should have a reason (a how-to, a tutorial). To build one, Timeline 1.0 assembles one audio spine plus ordered video slots into one MP4: audio.duration_seconds runs 1-1800, and the price is $0.10 per ceil(output minute). A 90-second cut is 2 billable minutes, so $0.20; a 45-second cut is 1 minute, so $0.10.

Pinterest's 15-minute cap is 900 s, which is inside Timeline's 1800 s limit. File size is the other cap, and 2 GB is far above what a short promo needs.

Decision rule

• Product promo or hook: one generation of 6-15 s.
• Explainer: stitch with Timeline, keep the first 6-15 s self-contained.
• Always read the real duration and file size from the final file.