Why a Multi-Post Instagram Grid Needs Mathematically Exact Slicing

A single photo spread across a profile grid

A recognizable Instagram trend involves splitting one wide photo, illustration or banner into several equal pieces, then posting each piece as a separate post so that they reassemble into the original image when viewed together on a profile grid.

Why the pieces have to be exactly equal

Instagram's grid displays every post at the same fixed square size regardless of the original image's shape. If the source photo isn't sliced into pieces of exactly equal width and height, the pieces will be stretched by different amounts when Instagram forces each one into its uniform square slot, causing visible misalignment and warped edges where the pieces are supposed to connect seamlessly.

The actual math behind slicing

Splitting an image into a grid of, say, 3 columns and 2 rows means dividing the image's total width by 3 and its total height by 2 to get each piece's exact dimensions, then cutting along those precise boundaries rather than eyeballing rough divisions. Even a few pixels of inconsistency between pieces becomes visually obvious once they're displayed side by side in separate grid slots.

It's not limited to Instagram

The same exact-grid-slicing technique is useful any time a large image needs to become a set of smaller, equally-sized tiles — printing a poster across multiple pages, or breaking a large diagram into sections.

Try it yourself

Our Image Splitter tool cuts any image into a precise grid of your chosen number of columns and rows, with a separate download for each piece.