A single video ad is a Facebook or Instagram ad built around one video clip, with primary text, a headline and a call-to-action button. It can run in feeds, Stories, Reels, in-stream positions and Meta’s partner network, and it is the format most advertisers use to show a product working or a person explaining a service.
How single video ads work
You choose the single image or video format, upload a video and write the text. Meta places the ad wherever your placement settings allow, cropping or padding the video to fit each one unless you supply alternatives. At the time of writing (October 2026), the practical shapes are:
- 4:5 or 1:1 for Facebook and Instagram feeds;
- 9:16 for Stories and Reels ads, filling the screen;
- 16:9 mainly for in-stream positions inside longer videos.
Video adds measurement layers that images do not have. Meta reports three-second plays, ThruPlay (watched to 15 seconds or to the end if shorter), and plays at 25%, 50%, 75% and 100%. From these you can see where people stop watching. Everyone who watches can also be collected into a video view audience for later retargeting.
A video ad can be optimised for different goals. A ThruPlay goal finds people likely to keep watching; a sales or leads goal uses video purely as the creative and judges it on conversions. Pick the goal that matches the job the video has to do.
Why it matters
Video can show what a still image cannot: how a product is used, what a treatment involves, who will turn up at the door. For a UK service business where trust decides the sale, such as a solicitor, a tutor or a builder, thirty seconds of the real person explaining how they work can do more than any headline.
Video also builds cheap warm audiences. People who watched most of an explainer are good candidates for a follow-up ad with a direct offer, at a lower cost than reaching strangers again. That two-step pattern, a useful video first and a clear offer second, suits UK businesses whose customers take time to decide, such as home improvements or private healthcare.
Common mistakes
- A slow start. Logos, music swells and title cards in the first seconds lose viewers. Lead with the strongest moment and track your hook rate.
- Relying on sound. Many feed viewers watch muted; add captions so the message survives without audio.
- One landscape edit everywhere. A 16:9 video in Reels looks out of place and wastes most of the screen.
- Judging on views. Cheap ThruPlays do not pay the bills unless they lead to enquiries or sales.
- Over-produced polish. Highly polished brand films can underperform simple phone footage that feels native to the feed.
How to act on it
Plan the first three seconds before anything else, then the single point the video must make, then the call to action. Film vertically and frame the subject centrally, so one shoot can produce 9:16 and 4:5 cuts. Add captions, keep the edit tight and check the quartile drop-off after a week to see where to trim. Use the ad’s goal to match the job: conversions if it should sell, ThruPlay if it should warm an audience you will retarget. I plan, brief and run video campaigns across placements in my Facebook video, Reels and Stories ads service.