Meta Ad Formats: Only Four, and Thirty Automatic Changes
The ads guide documents four formats. The specs change with every placement, one objective hides your call to action, and thirty enhancements alter it.
The platform’s own advertising guide documents four formats: image, video, carousel and collection. That is the entire list.
Almost everything else that gets called a format is a placement, an objective, or an automatic enhancement. Confusing those three with formats is why creative briefs on this platform go wrong, and why teams argue about which format to use when the real variable is where the ad will appear.
This page sets out the four, what actually changes between placements, one objective setting that removes your call to action, and the thirty automatic modifications that may be running on your account without you enabling them.
Four formats, and what separates them
The differences are structural, not stylistic.
Image. A single still. On the feed with an awareness objective, the specification is JPG or PNG, 4:5 ratio, 1440 by 1800 pixels, 30 MB maximum, minimum width 600 pixels and minimum height 750 at that ratio, with a 3% ratio tolerance.
Video. MP4, MOV or GIF, same 4:5 and 1440 by 1800 on that placement, up to 4 GB, from one second to 241 minutes. The technical requirements are specific: H.264 compression, square pixels, fixed frame rate, progressive scan, stereo AAC audio at 128 kbps or higher, and no edit lists or special boxes in the file container.
Carousel. Two to ten cards, each image or video, 1:1 ratio, at least 1080 by 1080. The text budget shrinks: 80 characters of primary text against 150 for image and video, a 20-character headline against 27, plus an 18-character description field the other formats do not have.
Collection. One cover asset plus three product images, requiring an instant experience as its destination. Its primary text runs to 125 characters and its headline to 40, the most generous of the four. It is also the only one of the four that does not support the app promotion objective.
What that list tells you. The choice between the four is mostly a choice about how much you can say and how many things you can show, not about how the ad performs. Nobody has published performance guidance separating them.
This is the part briefs get wrong, and it costs real money in reshoots.
Video in the feed. 4:5, 1440 by 1800, primary text 50 to 150 characters, headline 27.
Video in vertical reels. 9:16, 1440 by 2560, duration zero seconds to 15 minutes, and primary text capped at 44 characters. That is a third of the feed allowance, on the same format.
Video in stories. 9:16, 1440 by 2560, 125 characters of primary text, with duration limits that differ by surface: 1 to 3 minutes on one, up to 60 minutes on another.
Video in-stream. 16:9 or 1:1, at least 1080 by 1080, and a duration split by device: 5 to 15 seconds on desktop, 5 seconds to 10 minutes on mobile. One placement, two device contexts, a fortyfold difference in ceiling.
Rewarded video on the audience network. 9:16, 3 to 61 seconds.
What follows for production. Shoot the assets around the tightest constraint you intend to run, which for text is usually the 44-character reels field, and for framing is the vertical safe zone below.
The specification follows the placement, not the format. The 44-character reels field is usually the binding constraint. Source : Platform ads guide, read directly (2026)
The objective that hides your call to action
This one is documented, easy to trigger, and almost never mentioned.
What the platform states. If you select awareness as your video objective, or select maximize reach, maximize 2-second continuous video views, maximize impressions or maximize post engagement as your performance goal, the ad footer will not be displayed on the feed on mobile devices.
What the footer contains. The headline, the description and the call-to-action button.
What that means in practice. Your ad runs on the placement where most of your delivery happens, without the button, without the headline and without the description. Everything you wrote in those fields is invisible.
Why it catches people. Nothing in the interface warns you at the point of setup. The creative preview may not reflect it either. You find out by looking at a live ad on a phone.
What to do about it. If you are running awareness or a reach-type performance goal, put the call to action inside the creative itself. Spoken, or on screen, or both. Do not rely on a field the platform has told you it will not render.
The wider lesson. On this platform, objective selection changes what the ad looks like, not only how it is delivered. Treat the objective as a creative decision.
The platform does not tell you which format to use
There is a widespread belief that certain formats belong to certain objectives. The platform has never said so.
What it publishes. A page identifying which placements and which formats are available for each objective. Its own framing is that placements appear if they are supported by the advertising interface for all advertisers.
The vocabulary throughout. Available. Supported. Never recommended, never suited, never best for.
Where it does turn prescriptive. At the level of placement, not objective. It advises different aspect ratios for different placements, and gives the example of using a vertical ratio in stories so the asset covers the whole mobile screen. It also notes that stories work well with short copy.
What that means for your brief. Any rule of the form “use carousel for consideration” came from an agency, a blog or a habit, not from the platform. It may still be right. It is not documented.
One dated note worth checking. The flexible ad format was available only for traffic, engagement, sales and app promotion objectives, and the platform announced its removal from ad setup from March 2026. That change has taken effect, so anything written about it in the present tense is out of date.
This is the part of the platform that most changes what your audience actually sees, and it is opt-out rather than opt-in.
What the system does. The platform states that when automatic creative is on, your images and videos are optimised to versions your audience is more likely to interact with, and that some enhancements may be turned on by default, though you can turn them off.
The sentence to read twice. The platform states that the media and text you upload may be adjusted to help improve performance while maintaining the core message of your campaign. Adjusted, by them, to your uploaded assets.
How many there are. Thirty distinct enhancements are listed, ranging from brightness and contrast adjustment and subtitle generation through to background generation, image generation, text generation and video effects. Roughly half are marked as using or potentially using generative models.
Flexible media, separately. A setting that lets the platform adjust aspect ratios to deliver your media across additional placements when it sees an opportunity to improve performance. In plain terms: your visual can be recropped and shown where you did not choose to run.
The disclosure attached. Images created or materially edited with certain generative features may carry AI information in the ad’s menu or an AI label beside the ad label.
Where it does not apply. The platform notes that certain verticals, including financial services and pharmaceutical or health, and ads relating to housing, employment or credit, social issues, elections or politics, plus certain countries, may not have immediate access to all generative features. If you sell into regulated categories, check what is available to you before assuming any of it is.
The platform's own wording: the media and text you upload may be adjusted. Some of it is on unless you turn it off. Source : Platform automatic creative documentation (2026)
The vertical safe zones, and what reels refuses
Two sets of constraints on the vertical placements that are easy to breach and expensive to fix late.
The safe zone. The platform advises leaving at least 14% of the top, 35% of the bottom and 6% of each side free of text, logos and other important creative elements, so nothing is cropped, covered by the profile icon or call-to-action, or pushed too close to the edge on taller screens.
What 35% at the bottom means in practice. On a 2560-pixel-tall asset, roughly the bottom 900 pixels are unusable for anything that must be read. That is more than a third of the frame.
What reels ads will not accept. Reels published before 15 October 2021. Licensed music. Media carrying a face or camera effect. Media containing a GIF. Media with product tags.
Why the music restriction bites hardest. Teams routinely cut a reels ad to a track from the organic library and discover at upload that the ad version cannot use it. Source your audio for advertising rights from the start.
And the practical consequence of the safe zone. Design for the middle half of the frame. Everything above 14% and below 65% of the height is the only region you can rely on.
A note on where the vertical constraint spreads. Once flexible media is enabled, an asset built for the feed can be delivered vertically. If you have not respected the safe zone, that is where it will show.
What to check on your own account this week
Six checks, each of which takes minutes and each of which has caught something real.
Look at a live ad on a phone. Not in the preview. The preview does not reliably reflect the footer suppression or the automatic enhancements.
Check whether your objective is hiding the footer. If you are on awareness, or a reach or impressions performance goal, assume the headline, description and button are not showing on mobile feed.
Open the automatic creative settings. Note which of the thirty enhancements are enabled, particularly the generative ones and flexible media. Some will be on that you did not enable.
Count your primary text against 44 characters. If reels is in your placements, that is your real limit whatever the feed allows.
Overlay the safe zones on your vertical assets. 14% top, 35% bottom, 6% each side. Anything important outside that region is at risk.
Check your audio rights. If the ad is going to reels, licensed music from the organic library is not available to you.
Four documented formats: image, video, carousel, collection. Everything else you hear called a format is a placement, an objective or an enhancement.
Collection is the odd one out: it requires an instant experience destination and is the only format that does not support app promotion.
The specs follow the placement. The same video format wants 50 to 150 characters in the feed and caps at 44 in vertical reels.
One placement splits by device: in-stream allows 5 to 15 seconds on desktop and 5 seconds to 10 minutes on mobile.
Awareness hides your call to action. With that objective, or reach and impression performance goals, the headline, description and button are not displayed on mobile feed.
The platform never says which format suits which objective. It publishes availability, in the vocabulary of support. Any pairing rule you have came from elsewhere.
Thirty automatic enhancements exist and some are on by default, with the platform stating that the media and text you upload may be adjusted.
The vertical safe zone costs you half the frame: 14% off the top, 35% off the bottom, 6% each side.
How many ad formats does the platform actually document?
Four: image, video, carousel and collection. Everything else you hear named is a placement, an objective or an automatic enhancement, not a format.
What is different about the collection format?
It requires an instant experience as its destination, uses one cover asset plus three product images, and is the only one of the four that does not support the app promotion objective.
Do the specs depend on the format or the placement?
The placement, overwhelmingly. Video in the feed wants 4:5 at 1440 by 1800 with 50 to 150 characters of primary text. The same format in vertical reels wants 9:16 at 1440 by 2560 with primary text capped at 44 characters.
Why has my call to action disappeared on mobile?
Because of the objective. With awareness selected, or certain reach and impression performance goals, the ad footer including headline, description and call-to-action button is not displayed on the feed on mobile devices.
Does the platform recommend a format for each objective?
No. It publishes which formats are available for which objectives, in the vocabulary of support and availability. It never says use format X for objective Y, so any such rule you have been given came from somewhere else.
Can the platform change my creative?
Yes, and some of it is on by default. The automatic creative system lists thirty enhancements, and the platform states that the media and text you upload may be adjusted to improve performance while maintaining the core message.
What is flexible media?
A setting that lets the platform adjust aspect ratios so your creative can be delivered across additional placements. In practice it means your visual can be recropped and shown in placements you did not choose.
What are the reels safe zones?
The platform advises leaving at least 14% of the top, 35% of the bottom and 6% of each side free of text, logos and important elements, so nothing is cropped or covered by the interface.