An Instagram carousel slide is 1080 x 1350 px. Every slide inherits the aspect ratio of the first one, so a square opening slide forces the rest of the set into squares whatever you designed them at.
Where it shows
- Main feed with swipe dots
- Your profile grid, first slide only
- Explore tab grid
- Shares inside direct messages
- Bookmarked posts
The safe zone
Slide one is doing two jobs, because it is also the profile grid tile at 3:4. While someone swipes, a slide counter badge sits in the top right of the image and the dot indicator sits just under it, so neither the top right corner nor the bottom edge is fully clear. Keep swipe cues and page numbers at least 60 px in from the right edge and 60 px up from the bottom, and keep the slide one headline inside the middle 1012 px column so the grid tile does not clip it.
Quirks worth knowing
- Meta's publishing documentation says carousel images are all cropped based on the first image, with 1:1 as the default, so slide one decides the shape of everything behind it.
- The in-app limit is 20 slides, per Sprout Social's current guide, while Meta's API caps a carousel container at 10 items, so a scheduler will refuse the second half of a 20 slide set.
- Only slide one becomes the grid tile, so slides two through twenty never appear on your profile at all.
- A panorama split across slides does not join up while swiping. Instagram shows one slide at a time with no peek at the next, so every seam is a hard cut.
- Mixing a 4:5 slide and a 1:1 slide in one carousel is impossible after upload, because the ratio lock is applied at post time and cannot be changed later.
- Adjust Preview repositions the grid crop of slide one after posting, but it cannot promote a different slide into the tile.
Common mistakes
- Opening with a 1:1 title card and designing slides two onward at 4:5, which the ratio lock squashes back to square.
- Building a Swipe arrow into the bottom right of every slide, where the dot indicator and the counter badge already compete for attention.
- Planning 20 slides and then scheduling the post through a tool, which silently stops at Meta's 10 item API cap.
- Designing a continuous background that runs across slides, forgetting each slide is shown alone with no bleed into its neighbour.
What we recommend
- Set slide one to 1080 x 1350 px before designing anything else, since it decides the shape of the whole set.
- Treat slide one as a cover and slide two as the real opening, because the tile on your profile is only ever slide one.
- Keep each slide's content inside a 1000 x 1270 px inner area so the counter badge and dot row never land on type.
- Repeat one fixed element, a corner mark or a colour bar, on every slide so the set reads as one piece without a bleeding background.
- Post from the app when you need more than 10 slides, and save schedulers for shorter sets.
Common questions
Why do my carousel slides look squashed?
Instagram locks every slide to the aspect ratio of the first one. Meta's publishing documentation states that carousel images are cropped based on the first image, with 1:1 as the default. If slide one is square, a 4:5 slide two is cropped to square to match it.
How many photos can I put in one Instagram carousel?
20 in the app, according to Sprout Social's current size guide, with a minimum of 2. Meta's publishing API still caps a carousel container at 10 items, so anything scheduled through a third party tool tops out at 10. That gap catches a lot of people who design 20 slides and then schedule the post.
Which slide shows up on my profile grid?
Only the first, cropped to the 3:4 tile. Slides two onward are invisible until someone taps in and swipes. That makes slide one both the hook and the grid design, which is why a plain title card wastes the strongest position in the set.
Can I reorder carousel slides after posting?
No. Order and aspect ratio are both fixed at post time. You can reposition the grid crop of slide one through Adjust Preview, but reordering, replacing or re-cropping the slides themselves means deleting and reposting.
Can I make a panorama across several carousel slides?
You can, but it will not read as continuous. Instagram shows one full slide at a time with no partial view of the neighbours, so a split image lands as separate pieces rather than one wide scene. A repeated motif holds a set together better than a split background does.
More answers on thumbnail, carousel and cover questions are on the FAQ.