How the Instagram profile grid reads
Three facts decide how a split photo for an Instagram grid has to be made:
Three columns, newest first. The profile shows posts in rows of three, with the newest post in the top-left corner and older posts pushed right and down. Every new post shifts everything else by one place. Since June 2026 you can also reorder the grid by hand (long-press a post, then "Reorder grid"), and up to three pinned posts always sit at the top, whatever the order (MacRumors, June 9, 2026).
Thumbnails are 3:4, not square. In January 2025 Instagram changed the profile grid from square thumbnails to 3:4 rectangles (Planoly). Adam Mosseri said the reason was that most of what people upload is now vertical (Business Today, January 21, 2025). An old square puzzle viewed today loses a strip from each side of every tile, and the picture no longer joins up. Tiles built at 3:4 fit the thumbnail exactly.
1080 pixels is the width that is kept. Instagram's Help Center says photos are kept at their original resolution when the aspect ratio is between 1.91:1 and 3:4, at a width of 1,080 pixels and a height between 566 and 1,440 pixels. A 1080 × 1440 tile is the tallest shape that is not cropped, which is why every tile from this tool is that size (Instagram Help Center, photo resolution, checked November 3, 2026).
One limit you cannot design around: the profile draws a thin line of background between every thumbnail. Your puzzle will always show those hairline gaps, and nothing in the tiles can remove them. Avoid placing a one-pixel detail, such as a fine line of text, exactly on a cut.