Carousel Scroll Generator

A seamless carousel is an Instagram post whose slides are consecutive pieces of one wide image, so swiping through it scrolls across the picture rather than stepping between separate photographs. It is one of the few native formats on the platform that rewards a landscape composition: a panorama that would be cut to a stripe in a single feed post gets the full height of three or four slides instead, and the swipe itself becomes part of how the image is read.

Getting it right is a matter of arithmetic rather than design. Each slide has to be exactly the same width, cut on a whole-pixel boundary, and share its edge precisely with the next - a single pixel of drift shows up as a visible jump halfway through the swipe, and a final slide narrower than the others makes the sequence end abruptly. This tool crops the source to exactly the strip the slides need, divides that strip into equal columns, and spreads any leftover pixels one at a time across the leading slides rather than dumping the remainder on the last one.

It also picks the slide count for you. How many slides a panorama wants depends on its aspect ratio and on the shape of slide you choose - a 3:1 panorama is three square slides but four portrait ones, because portrait slides are narrower. The tool suggests the count that matches your image most closely, and stops adjusting once you set it yourself. Slides download individually or as a numbered zip, and everything runs on a canvas in your browser, so the image is never uploaded.