An Instagram carousel is a single feed post with up to 20 photos or videos that people swipe through. You create one in the app via Create, Post and "Select multiple". Every slide gets the same orientation: square, portrait or landscape. For text slides, portrait at 1080 pixels wide is the safe choice: Instagram keeps photos uncropped up to an aspect ratio of 3:4, so up to 1080 × 1440 pixels (as of November 2026, Instagram Help Center). The usual structure: slide 1 is the hook and gives people a reason to swipe. Every following slide carries exactly one idea. The last slide sums up and asks for one action. The caption adds to the slides instead of repeating them.
Tools for Instagram in general are in Instagram Content Tools: What You Need, planning over several weeks in How to Build an Instagram Content Plan, and what AI can take over for reels in Can AI Create Instagram Reels?. This post is only about the carousel.
What an Instagram carousel post is
Instagram itself calls the format a carousel: up to 20 photos and videos shared as one post to your feed. People see the first item with a row of dots underneath, and likes and comments apply to the whole post.
Three rules from the Help Center to know first:
- You can't add slides afterwards. Reordering, removing slides and editing the caption work. New photos or videos can't be added once it is shared; you can only delete the post.
- Videos in a carousel are not reels. They don't show up in the Reels tab and have no reels features. A video built for reels reach goes out as a reel.
- Music only without video. Photo-only carousels can get music in the last step; with a video in it, that isn't possible.
Since 30 April 2026, Instagram's originality rules also cover photos and carousels. Accounts that mainly re-upload other people's work are no longer recommended. A border, watermark, subtitles or a credit in the caption don't count as your own contribution. A how-to guide or visual story you designed is explicitly original, and so is an expert carousel built from your own knowledge.
Instagram carousel size: the dimensions
The numbers come from Instagram's Help Center page on aspect ratios (as of November 2026). Photos are uploaded at up to 1080 pixels wide. Between 320 and 1080 pixels wide and between 1.91:1 and 3:4, a photo keeps its resolution; anything outside is cropped to a supported ratio.
Many templates are still set up at 4:5, which is inside the allowed range. More important is one rule from the Help Center: the orientation you choose applies to every photo and video in the post. Drop a landscape image into a portrait carousel and it gets cropped, along with the text at its edge. So build every slide at the same size and keep text away from the edges; Instagram does not say how much margin is enough.
Scheduling tools hit the same ceiling: Meta's publishing API allows up to 20 images, videos or a mix, and crops every image based on the first one, 1:1 by default. Whether your tool uses all 20 is in its own help pages.
How many slides a carousel needs
Instagram allows 20 slides but does not recommend a number. A rule of thumb, not a measurement: one slide per idea, plus a title and a close. Five points make seven slides. Pad it out to twenty and you lose readers in the middle.
What Instagram does say is in Adam Mosseri's ranking explainer (31 May 2023). In Feed, the five interactions it looks at most closely are how likely you are to spend a few seconds on a post, comment, like, share and tap the profile photo. In Explore, likes, saves and shares matter most. Nothing in there says long carousels get preferred. One more slide only helps if people read it.
Structure: hook, content, call to action
A carousel has three parts, each with its own job.
Slide 1, the hook. It has to stand alone in the feed and give a reason to swipe: a concrete claim, a number, a mistake the reader is making right now. A topic as a headline ("Bookkeeping tips") is not a reason. The patterns for strong first lines are in How to Write Strong Instagram Reel Hooks, and they work for slide 1 just as well.
Slide 2 to the second-to-last, the content. One idea per slide, short enough to read without holding the slide. Numbered steps show how far there is to go. A slide 2 that also works as an opener never hurts.
Last slide, the call to action. A one-sentence summary, then a single action: save, answer a question in the comments, open the link in your bio. Three calls to action add up to none.
An example: an accounting firm makes a carousel on "Which receipts do I have to keep?". Slide 1: "Almost everyone throws these three receipts away too early." Slide 2: why that gets expensive. Slides 3 to 5: one receipt each, with its retention period. Slide 6: "Save this for your year-end." The caption tells where the question came from. Good carousel ideas come from the same places as any post: the questions customers keep asking, the mistakes you fix for others. How the first caption lines are built is in How to Write Instagram Captions.
How to make an Instagram carousel in five steps
- Pin down one core message. A sentence the reader can repeat after the last slide.
- Write the slide texts as plain text first. All slides in one document before you design anything. This is where you notice that slide 4 repeats slide 3.
- Build one template and reuse it. One size (1080 × 1440 or 1080 × 1350 px), one typeface, two colours, fixed spots for title and page number, so people recognise your posts.
- Export as images and check on your phone. PNG or JPG at the target size, read on the phone, not on a big screen.
- Upload. In the app: Create, Post, "Select multiple", tap the images in order, Next, filters, Next, music if photo-only, caption, Share.
What to build the slides with
Three routes are enough:
Carousel generators are fast, but without your audience their text fits any account. Free image tools and what you may do with the images are covered in Creating AI Images: Free and Free to Use.
The most common mistakes
- Mixed orientations: a landscape slide in a portrait carousel gets cropped.
- Slide 1 without a reason to swipe: a topic is not a claim.
- Two ideas on one slide: one of them won't get read.
- No call to action, or three of them.
- Other people's material without your own contribution: since April 2026 that costs recommendations for carousels too.
- Planning video and music together, or forgetting a slide that can't be added afterwards.
What carousels did on my channel
Less reach than reels, honestly. In Conny's review, reels reached a median of 485 accounts on my channel and carousels 57, then repeatedly below 200 with zero saves. Production shifted to reels after that, and the carousel came back once its format had been reworked. That is one account, not a law, but "carousels always perform" is not a fact. Measure it yourself: Insights break down accounts reached by followers and non-followers, so you see whether your carousels reach new people or mostly existing followers.
Who drafts the carousels in my business
In my business, the drafts are written by an AI employee. Conny knows my audience, my content pillars and my rulebooks for hooks and storytelling, turns them into reel scripts and carousels, and checks every draft against the rules before I see it. Posting is my gate: she drafts, I approve. She invents no personal facts about me: no anecdotes, no numbers, no client details. If something is missing, the spot stays blank, which matters most in expert carousels with deadlines, amounts or legal references.
For another business, Conny does not copy my pillars. You define voice, audience, platform, content pillars and approval flow, and expert carousels are among the things that work with that. How the whole workforce fits together is in My AI Workforce: Fourteen Employees, One Boss.
Frequently asked questions
How many photos can an Instagram carousel have?
Up to 20 photos and videos in one post, mixed is fine (as of November 2026).
What size is an Instagram carousel?
1080 pixels wide. In portrait, at most 3:4, so 1080 × 1440 pixels; 1080 × 1350 pixels (4:5) is common too. All slides get the same orientation.
Can I add music to a carousel?
Yes, if it only contains photos. With a video in it, the Help Center says it isn't possible.
Can I add a photo to a carousel after posting?
No. Reordering, removing slides and editing the caption works. For a new slide you have to delete and post again.
Do videos in a carousel count as reels?
No. According to Instagram they don't show up in the Reels tab and have no reels features.
Do carousels get more reach than reels?
Instagram gives no general answer. On my channel it was the other way round. Check your own Insights.
What to do next
Take the question your customers ask most often and write the answer as seven slide texts: hook, five ideas, a close with one action. Only then design it, with a template you will reuse. To see how others build their templates and rulebooks, and what Conny looks like as a ready-made template, join my community AI Employee Framework.
