The best size
1080 by 1350 pixels, a 4:5 ratio. It is the tallest shape the Instagram feed shows in full, so your carousel takes up more of the screen than a square one.
How many slides?
Instagram carousels take up to 20 photos. Five to ten is plenty for most topics.
Make TikTok and Instagram versions in one place
Slidemate supports 9:16 for TikTok and 4:5 for Instagram carousels. Design once, pick the format, and export every slide at the right size, in the same TikTok font that makes slides look native anywhere.
Updated October 1, 2026