CarouselSplitter

A seamless carousel is one long image spread across several slides. As people swipe, the picture keeps going, which makes panoramas, timelines and step-by-step designs feel like one piece. It also tends to keep people swiping to the end.

This tool crops your image to the full strip, for example 3240 × 1350 for three portrait slides, then cuts it into equal slides at 1080 pixels wide. The edges line up exactly, so there's no visible join.

The best number depends on your image's shape. Divide its width by its height, then by the slide shape: 0.8 for portrait, 1 for square. A 4:1 panorama fills about five portrait slides without cropping. The tool does this math for you and shows how much of the picture each choice cuts away.

More slides isn't always better. Each extra slide is another swipe to ask for, so stop when the story or the view is complete.

If the tool says a lot is cropped away, change the slide count before you change the photo. Wide landscapes often suit four to six slides; a group photo may only need two or three.

Portrait 4:5 slides at 1080 × 1350 take up more of the screen in the feed, so they're usually the better pick. Square 1:1 slides at 1080 × 1080 suit wider, shorter panoramas, because less gets cropped from the top and bottom.

All slides in a carousel are shown at the same shape as the first one, so keep them consistent, which this tool does by design.

A few things make a split carousel look intentional:

• Keep faces and text away from the cut lines, where people see the image in two halves.
• Give the first slide a reason to swipe: an arrow, a partial subject, or a headline.
• Use a large original. Five portrait slides need an image 5400 pixels wide to stay sharp.
• Upload all slides in one post, in number order. They join up only inside the carousel, not on your grid.
• Tell people to swipe in the caption, and save the best part of the view for the last slide.