Short answer: a carousel ad presents several swipeable cards. On Meta’s Facebook Feed, it can contain 2 to 10 image or video cards. Use one when your app has several things worth showing in a row: features, steps, or a before and after. Make the first card work as an ad on its own, and if the cards tell a story in order, switch off Meta’s automatic card ordering, as Meta itself advises. Then test the carousel against a single image and a video of the same idea, on cost per conversion.
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Where can app advertisers run carousel ads?
- Meta. Meta’s ads guide for carousels with the app installs objective allows 2 to 10 cards. The current Instagram Feed app-promotion guide also lists 2 to 10 cards, but its aspect ratios and video-length limits differ.
- TikTok. TikTok’s carousel ads help page lists App Promotion among the supported objectives. The cards are images that “display in order,” and people swipe through them. It runs on automatic placement or TikTok-only placement.
- Google App campaigns take assets that Google combines into ads, rather than a manually ordered carousel as the creative input. Supply varied text, image and video assets; Google also supports HTML5/playable assets for mobile games, as its App campaigns guide describes.
When should an app use a carousel instead of a video or single image?
A carousel earns its place when the idea is a sequence or a set:
- Several features, each with its own card, for apps whose value is a toolkit rather than one trick.
- Steps, such as how a budgeting app gets you from bank link to a plan, one card per step.
- A before and after that needs a middle: the photo, the edit, the result.
- Levels or modes in a game, each a little harder or stranger than the last, so the swipe is driven by curiosity.
If the idea is one claim, a single image or a short video usually says it faster. And if it is a story with motion, video does it better. Treat the carousel as one more format inside a creative direction, not as a separate strategy: alongside a static and a video version of the same concept, it tells you whether the swipe adds anything. The static vs video post covers the same logic for those two formats.
How should you order the cards?
Make the opener work on its own. If you control the order, lead with the strongest supported claim, result or image. If automatic ordering is enabled, make every card understandable as an opener. The same rules as any hook that stops the scroll apply.
Each card should earn the next swipe. Give a reason to keep going: a numbered step, an image that runs across the card edge, a question card 2 answers. Five unrelated screenshots with the same headline give people no reason to swipe.
End on the install. The last card should make the reason to install plain, with the app on screen.
Decide whether Meta can reorder the cards. Meta can optimize the order of carousel cards based on how each performs; its carousel ad format page says not to turn this on if you are telling a sequential story. The Marketing API reference identifies this as multi_share_optimized, enabled by default. So:
- Cards that tell a story in order: switch automatic ordering off.
- Cards that each stand alone (five features, five levels): leave it on and let Meta find the best opener.
What are Meta’s carousel specs for app installs?
From Meta’s ads guide for Facebook Feed with the app installs objective:
| Spec | Image cards | Video cards |
|---|---|---|
| File type | JPG or PNG | MP4, MOV or GIF |
| Aspect ratio | 1:1 | 1:1 (3% tolerance) |
| Size | Minimum 1080 x 1080 px, up to 30 MB | Up to 4 GB |
| Length | n/a | 1 second to 240 minutes |
| Cards | 2 to 10 | 2 to 10 |
Meta recommends 80 characters for primary text, 20 for the headline and 18 for the description on this placement. These are text recommendations, not universal hard limits. For Instagram Feed, the current guide recommends 4:5 for image-only carousels and 1:1 when videos are included; video cards can run from 1 second to 2 minutes. Check each selected placement’s preview before launch.
How do you know whether a carousel is working?
Judge the ad as a whole on cost per conversion, with the event defined separately. Compare it with a single image and a video of the same concept. Swipes and clicks help diagnose attention; they do not establish affordable conversions. Our ideal is 10 conversions a day per creative under test; 2 or 3 is the bare minimum when cost per conversion is very high. Uneven delivery within a campaign can leave a format inconclusive, so check its own spend and conversions before declaring a winner.
If the carousel loses, inspect the opener, message and post-click experience before deciding what to change. If it wins, make variants: new first cards, a different card order, new headlines. Those are variants of the same concept, not new ideas, as creative concept vs creative variant explains.
Frequently asked questions
How many cards should a carousel ad have? The current Facebook Feed and Instagram Feed app-promotion guides allow 2 to 10. Use as many as the idea needs, and check the selected placement rather than treating one count as best for every carousel.
Can you mix images and videos in one carousel? On Meta, yes. Its Instagram guide explicitly describes carousels containing videos as well as image-only carousels. TikTok’s carousel format uses image cards.
Should you let Meta reorder the cards? Only if each card stands alone. Meta advises against automatic ordering when the carousel tells a sequential story.
Do carousel ads work on TikTok and Google App campaigns? TikTok supports image carousels for App Promotion. In Google App campaigns, you supply assets that Google combines into ads; do not plan on uploading a fixed, manually sequenced carousel.
