Instagram Carousel Sizes and Dimensions in 2026

The short answer

Here are the four carousel formats that matter in 2026, in pixels:

• 4:5 (portrait, default): 1080x1350 pixels. The recommended choice for almost every carousel.
• 3:4 (new, taller): 1080x1440 pixels. About 7% more vertical space than 4:5, and it matches the profile grid crop exactly.
• 1:1 (square): 1080x1080 pixels. Safe and simple, but it gives up vertical space the taller formats use for text.
• 1.91:1 (landscape): 1080x608 pixels. Rare for carousels, useful mainly for wide screenshots or panoramic photos.

Every carousel can hold up to 20 slides, and every slide in a single post is forced into the same aspect ratio. That last part is the rule that trips up most people, so it gets its own section next.

The first-slide rule

Instagram doesn't let you mix ratios inside one carousel. Whatever aspect ratio you set on slide 1 becomes the aspect ratio for every slide that follows, and anything that doesn't match gets cropped to fit, not resized politely. Build a 4:5 carousel and drop in a square photo on slide 6, and Instagram will crop the top and bottom off that photo without asking. The fix is simple: decide the format before you start, apply it to the whole carousel in your editor, and every slide you add afterward will already be correct.

Why 4:5 is still the safe default

Despite the newer options, 1080x1350 remains the format Instagram's own uploader defaults to, and it's the ratio with the longest history of strong engagement across the platform. It gives you more vertical room than a square post for text and layout, without the extra cropping considerations that come with the newer 3:4 format. If you're not sure which format to pick for a given post, 4:5 is the answer that's least likely to cause a problem later.

The new 3:4 format explained

The 3:4 ratio, 1080x1440 pixels, is roughly 7% taller than 4:5. The reason it exists is the profile grid: Instagram's grid thumbnails are cropped to 3:4, so a carousel shot natively in 3:4 shows up in the grid exactly as designed, with nothing trimmed off. That makes it a strong choice when the grid view of your profile matters as much as the individual post, for example if you're building a cohesive visual feed for a brand or studio. It's not automatically the better choice for every post; for a single one-off carousel meant to be seen in the feed rather than the grid, 4:5 is still simpler.

How the profile grid crops your slides

Every post on a profile grid, no matter its original ratio, is shown as a 3:4 thumbnail. A 4:5 post loses a slice off the top and bottom to fit that shape. A 1:1 post loses even more, cropped in from both top and bottom to make up the difference. This is invisible while you're designing in a full-size canvas, and it's the single biggest reason people are surprised their carefully centered text or logo looks off-center once the post is live. If your grid's overall look matters, check how each format actually crops before you commit to one for an entire content series.

Safe zones: where text survives

Beyond the grid crop, the feed itself covers part of your first slide with the caption, username and action buttons. A workable rule is to keep at least 50 pixels of clear space from every edge on every slide, and to treat the bottom quarter to third of slide 1 specifically as reserved space, since that's where the feed UI sits most consistently. Text or faces placed there will be partially covered for a large share of viewers. Our dedicated step-by-step carousel guide walks through applying safe zones while you build, rather than checking for problems after the fact.

Export settings that keep it sharp

Getting the canvas size right doesn't help if the export undoes it. Export at exactly 1080 pixels wide, in the sRGB color profile, as a proper image file rather than a screenshot. Instagram re-compresses every upload regardless of source quality, and a soft or undersized export gets compressed on top of already being soft, which is where most of the visible blur on Instagram posts actually comes from. Bigger than 1080px wide gains nothing; smaller gets upscaled and loses detail before it even reaches Instagram's own compression step.

Set it once in your editor

The most reliable way to avoid all of the above is to stop thinking about pixels per slide and set the format once, at the carousel level. In Postd, you pick the aspect ratio for the whole carousel up front, a safe-zone overlay stays visible on the canvas while you design, and every new slide you add or import inherits the same size automatically. See how the editor handles formats and safe zones, or open it directly and try a carousel yourself.

FAQ

What is the best Instagram carousel size in 2026?

1080x1350 pixels, a 4:5 ratio, is the safest default. It's still the upload default in the Instagram app and has the longest engagement track record of any carousel format.

Can I mix square and portrait slides in one carousel?

Not without losing control of the result. Instagram takes the aspect ratio of your first slide and forces every following slide into that same shape, cropping anything that doesn't match.

What is the new Instagram 3:4 format (1080x1440)?

It's a taller carousel format, about 7% more vertical space than 4:5, sized at 1080x1440 pixels. Its aspect ratio matches the 3:4 crop Instagram already uses for your profile grid thumbnails.

How many photos can I put in one carousel?

Up to 20 per post. All 20 slides share the aspect ratio set by the first slide, so plan the format before you add the rest.

Try it yourself

Pick a format, lock it in, and build a carousel that fits every crop Instagram throws at it. The editor runs in your browser, the free version needs no account and no card — just open it and build. Pricing is on the pricing page, no fine print.