The same ad can look sharp in one placement and clumsy in the next. Most of the time the reason isn't the idea — it's the shape. A vertical video squeezed into a square feed slot loses its top and bottom; a landscape video in a phone feed becomes a thin strip with a lot of empty space around it.
The good news: there are only four shapes worth caring about, and if you plan the frame once, you can serve all of them from one video.
The four shapes and where they live
9:16 — vertical, full screen. The native shape of short-form video: TikTok, Instagram Reels and Stories, YouTube Shorts, Facebook Reels. It fills the whole phone screen, which is exactly why it works — nothing else competes for attention. If you make one format, make this one.
4:5 — portrait, for feeds. Instagram and Facebook feeds show 4:5 taller than a square, so it takes more of the screen as people scroll past. It's the best shape for feed placements that don't play full screen.
1:1 — square. A safe default for feeds, some marketplaces and placements that crop everything to a square anyway. It gives up some height compared with 4:5, but it rarely looks wrong.
16:9 — landscape. YouTube in-stream ads, your website, presentations and big screens. On a phone held upright it's the weakest shape, but in its own placements it's the only one that fits.
Watch the edges: platform UI covers part of your frame
On vertical placements the platform draws its own interface over your video: the account name and caption at the bottom, the like, comment and share buttons down one side, sometimes a call-to-action button. Anything you put in those areas — a price, a logo, a line of text, the presenter's chin — may be covered.
Each platform publishes its own "safe zone" guidance and adjusts it from time to time, so check the current version before a big campaign. As a rule of thumb for 9:16:
- Keep the bottom fifth of the frame free of anything important.
- Keep text and faces away from the side where the buttons sit.
- Leave a margin at the top for the account name and progress bar.
- Put on-screen text in the middle band, large enough to read on a small phone.
Plan the frame once
Here's the trick that saves the most work: compose the vertical master with the subject and the product inside a central 4:5 band. If the face and the product sit in the middle of the frame, then:
- the 4:5 version is a simple crop — it keeps most of the frame;
- the 1:1 version is also a crop — fine for close-ups and medium shots, riskier for full-body shots or two people side by side;
- the 9:16 master stays intact for full-screen placements.
What you can't do is crop a vertical video into 16:9. A 16:9 slice of a 9:16 frame keeps less than a third of its height — usually the presenter's eyes and nothing else. Landscape needs its own shots, filmed (or rendered) in landscape from the start.
Don't burn captions into the master
Captions and on-screen text should be added per format, not baked into the master video. A caption that sits nicely above the bottom safe area in 9:16 ends up cut in half by a 1:1 crop, or floating in the middle of a 16:9 frame. If captions are a separate layer, each format gets them in the right place, at the right size, with lines broken to fit.
This matters twice as much in right-to-left languages such as Arabic and Hebrew, where a line of text that mixes words, numbers and an English brand name needs to be laid out properly for each width.
Length: shorter than you think
There's no single right length, and the limits change by platform and placement. What holds across platforms is simpler: the first seconds decide whether anyone watches the rest, and most short ads say what they need in 15 to 30 seconds. If an ad runs longer, make sure every shot earns its place — and that the offer arrives before people leave.
A quick checklist
- One master in 9:16, with the subject and product inside the central 4:5 band.
- 4:5 and 1:1 as crops of the master; check every shot for cut-off faces and products.
- 16:9 made as its own version, shot by shot, if you need YouTube or your website.
- Captions and text as layers, laid out per format, inside each placement's safe zone.
- The offer and the brand before the end of the shortest version you'll run.
- One last look at each format on a phone, not just on your laptop.
How Facefluence handles formats
Every Facefluence video is made as a 9:16 master composed for cropping, so the 4:5 and 1:1 versions are free crops. The 16:9 version (from the Pro plan) is re-rendered shot by shot in landscape, with the same presenter, references and audio, so the cut stays identical; it costs the shots' seconds in credits, and you see that cost before anything runs. Captions and graphics are never burned into the master — they're laid out again for each format.
The result is one ad, in every shape it needs, without starting over for each placement.