Choose 4:5 or 9:16 Before Designing Your Carousel

Start with the viewing context

A feed card is often viewed among other posts. A full-screen vertical video may have captions, account information and playback controls around it. The visible area can differ across app surfaces and devices.

Do not treat a single exported frame as proof that every platform preview will show the same crop. Review the actual destination preview when available, and keep essential information away from uncertain edges.

The underlying shapes are straightforward:

At the same 1080-pixel width, a 4:5 canvas is 1350 pixels high and a 9:16 canvas is 1920 pixels high. Those are geometric examples, not a claim that every upload path accepts either file at that resolution. Check the current destination requirements as well as the creation tool's controls.

Keep the same lesson while changing the layout

Our example teaches a designer to check a print proof before approving it. The five cards are:

1. “Check the proof before you approve the print.”
2. “Confirm the finished size, not just the page size.”
3. “Read the smallest line at the size it will print.”
4. “Check the contact details against the approved source.”
5. “Approve the version you checked, not an earlier attachment.”

The subject does not change when the canvas changes. The amount of empty background, line wrapping and relationship between the proof image and its explanation do.

For a 4:5 version, use a focused proof detail with one short explanation beneath it. Do not shrink the whole document merely to fit more surroundings. For a 9:16 version, the proof detail can sit above the explanation with enough separation for the eye to follow the sequence.

Neither version needs extra benefits added to fill the space. More height is not a reason to turn one useful check into a paragraph of generic advice.

Recompose rather than stretch

Stretching a 4:5 card to fill 9:16 distorts shapes and text. Centering it unchanged inside a taller background preserves its proportions, but it may leave the real lesson unnecessarily small.

Recomposition changes the arrangement while preserving the source material. Move the proof detail, adjust its crop, rewrite the line break and inspect the result at a representative phone size.

For the smallest-text card, the required detail is the line the viewer is being asked to inspect. If that line cannot be read, remove unrelated surroundings or use a separate accurate close-up. Do not invent sharper text inside a generated replacement screenshot and call that the original proof.

The app screenshot carousel guide provides a related method for selecting interface details rather than shrinking an entire screen into each card.

Do not confuse canvas shape with delivery format

An image carousel may contain 4:5 slides. A timed video may use 9:16 frames. Those are common design choices, not a rule that image files must be 4:5 or videos must be 9:16.

Prolifik's current carousel implementation supports 4:5 and 9:16 choices, with 4:5 used for new decks by default. Existing projects can retain an earlier shape. Inspect the selected project rather than infer its dimensions from the name of the format.

Also inspect what the project actually returns. Native slide images, a video render and a platform publication record are separate things. A list of slide assets is not proof that a connected destination accepted a swipeable image post. A video URL is not a PDF export.

Choose the destination and supported publishing path before promising a particular delivery to a client. Use the image-versus-video carousel comparison for that earlier decision.

Check text, crops and sequence at the final size

Run three separate reviews. First inspect the full exported image or video frame. Then view it at the width people will actually see. Finally, inspect the destination's preview, including its controls and any crop.

For our proof example, ask a reviewer to name the check on every panel without enlarging the preview. If they must zoom in to understand the instruction, the composition needs work.

For the timed version, also check whether the displayed card remains long enough to read and inspect. A taller canvas does not create extra reading time. If a panel contains a detailed proof, shorten the explanation or extend that panel's viewing time where the available controls allow it.

Keep page numbers, progress marks and labels consistent if you use them. They should help orientation, not compete with the lesson or rely on an edge that a preview may crop away.

Keep two approved versions when two contexts matter

If both feed images and full-screen video matter, keep two named compositions rather than repeatedly resizing one master and overwriting it. Save the original source images and approved copy with both versions.

A correction to the proof example should reach every exported version. Record which card changed, then inspect the relevant image and the corresponding video interval. Do not assume updating the text in one project silently replaces a file already scheduled elsewhere.

To make the carousel, explore Prolifik Image Carousel. Select the structure, ratio and supported delivery deliberately, then review the actual output rather than its settings alone.