Why Your Instagram Grid Gets Cropped — and the 3:4 Fix

You split a photo into perfect tiles, posted them in order, and the grid still looks a little off — edges that do not quite meet, a face that shifts between two cells. It is almost never your export that is wrong. It is a mismatch that most splitters quietly ignore.

Two different aspect ratios

Feed posts can be 4:5, which is the ratio most people design and export to. But the profile grid renders each thumbnail at 3:4 — a slightly taller, narrower crop. Post a 4:5 tile and Instagram trims its top and bottom to fit the 3:4 cell, so the part you carefully aligned at the edges is no longer at the edges.

Why a tiny crop breaks the whole picture

In a connected grid, alignment is unforgiving. Trim even 10% off the top and bottom of every tile and a horizon line drops, a diagonal jogs, and a face slides out of place. Because the crop happens to all nine tiles at once, the errors stack instead of cancelling out, and a layout that looked perfect in your editor reads as scrambled.

The fix: split at 3:4

If you cut and export your tiles at 3:4 (1080 × 1440), the grid shows them with zero extra cropping. Every seam lands exactly where you designed it. Feediz does this by default and even compensates for the roughly 1px gap Instagram draws between thumbnails, so diagonal lines do not jog across the seams.

How to check before you post

Never trust the math alone — confirm it with your eyes. Use a live grid preview that renders your tiles inside a pixel-accurate profile mock, so you verify the alignment before a single post goes live. No test uploads, no deleting, no awkward half-built grid sitting on your profile while you fix it.