How Instagram's 20-Slide Carousels Work and What the New Limits Are

Instagram now allows up to 20 photos and videos in a single carousel post, double the previous limit of 10.

How to Create a Carousel

Each slide in a carousel can be a photo or a video:

• Photos: Up to 30 MB per image. Supported formats include JPEG and PNG.
• Videos: Up to 4 GB per clip, with a maximum length of 60 seconds per video slide.
• Aspect ratio: The first slide sets the crop for the entire carousel. Instagram forces all subsequent slides to match the aspect ratio of slide one. If your first slide is 4:5 portrait, every slide will be cropped to 4:5.
• Supported ratios: Square (1:1), landscape (1.91:1), and portrait (4:5). The 4:5 portrait ratio at 1080 x 1350 pixels takes up the most vertical screen space in the feed.

The aspect ratio lock is the single most common source of confusion. If you mix landscape and portrait images in the same carousel, Instagram will crop the outliers to fit. There is no per-slide override.

How the Algorithm Treats Longer Carousels

Instagram re-serves carousels to users who did not swipe through all slides on first view. The platform may show the carousel starting from the slide where the viewer last stopped.

This means a 20-slide carousel gets more re-entry opportunities than a 5-slide one. But longer is not automatically better. If viewers consistently exit at slide 4, the algorithm reads that as low engagement quality. The useful range for most content types appears to be 8 to 12 slides for educational posts, with 15 to 20 working best for visual storytelling, photo dumps, or detailed walkthroughs.

Scheduling and Third-Party Tools

Most scheduling tools that support carousel posts have updated their limits to match Instagram's new maximum. If you are using a publishing tool and it still caps you at 10 slides, that tool has not updated its API integration yet.

One thing to check is whether your scheduling tool preserves slide order when uploading more than 10 items. Some tools that were built around the old 10-slide limit handle the expanded range correctly, while others may reorder or drop slides beyond the original limit. Test with a draft post before scheduling a live 20-slide carousel.

What the Expanded Limit Does Not Change

• The carousel format is still a feed format. Stories, Reels, and Guides are unaffected. You cannot publish a 20-slide carousel as a Story.
• Instagram still does not support different aspect ratios within the same carousel. Every slide follows the first.
• There is no built-in analytics breakdown per slide inside Instagram's native Insights yet. The new carousel slide engagement metric in Insights rolled out separately to the carousel expansion and shows which slide earned the most interaction.

FAQ

Can I mix photos and videos in a 20-slide carousel? Yes. Any combination of photos and videos is supported. Each video slide can be up to 60 seconds.

Does the 20-slide limit apply to ads? Carousel ads have their own specifications and limits, which are set through Meta Ads Manager. The 20-slide limit is for organic posts.

What happens if I reorder slides after publishing? You cannot reorder carousel slides after publishing. Instagram added the ability to delete individual slides from a published carousel, but reordering requires deleting and reposting.

Is there a text limit per slide? Instagram does not enforce a hard text limit, but heavy text overlays can reduce engagement. Keeping text below 20 percent of the slide area is a common guideline.