3×3 vs 3×4 Instagram grids
A 3×3 fills exactly one screen of a typical profile grid and is the shape most people picture when they say “puzzle feed.” A 3×4 (twelve tiles) is a taller poster: it will scroll on the profile, and the top row will be pushed down as you post more later.
The free tool cuts 3×3. 3×4, 4×4 and a clean export without the small mark are the Pro waitlist. If you only need the main square, stay on the free cut.