Split an Image into a Grid

Grid splitting turns one striking panorama into a set of tiles that reassemble on a profile page. The mechanics are simple division, but the details decide whether seams line up. Tiles must be mathematically equal, posting order matters (grids fill newest-first, so tiles go up in reverse), and every tile has to survive the platform recompression without its edges drifting. This tool numbers the output files in the exact upload sequence so the reassembled picture cannot come out shuffled.

Instagram deserves its own paragraph because it moved the goalposts: since January 2025 the profile grid displays 3:4 previews instead of squares. A classic 3x3 built from a square source now gets its tile edges shaved in grid view, breaking the continuous image. The current recipe for a seamless grid is tiles composed at 3:4 - 1080x1440 each - meaning a full 3x3 wants a source in 9:12 proportions. The preset here does that arithmetic for you.

Exact division has a hidden remainder problem. Split a 1000-pixel-wide image into 3 columns and you get 333.33 pixels per tile - impossible. Naive splitters either leave a one-to-two-pixel strip dangling on the final tile or silently stretch tiles to compensate, and both create visible seams. Handling the remainder deliberately, by distributing leftover pixels across tiles, keeps every boundary clean at the cost of tiles differing by at most one pixel - invisible in practice.

Beyond social grids, splitting has quieter uses: cutting a scanned poster into printer-page sections, breaking a sprite sheet into individual frames, dividing a large map for a slide deck, or making a physical photo puzzle. For print work, split at full resolution and let each tile keep maximum pixels - you can always shrink pieces later, but seams from premature downscaling cannot be unbaked.