Every sliced tile is extracted directly via the HTML5 Canvas 2D specification method ctx.drawImage(sourceImage, sx, sy, sw, sh, 0, 0, dw, dh). By defining exact source coordinate rectangles (sx, sy, sw, sh) with zero floating-point remainder errors, master assets retain 100% pixel fidelity without blurring or boundary seams.

Modern web reassembly leverages display: grid; grid-template-columns: repeat(C, 1fr); gap: 0; line-height: 0; alongside images set to display: block; width: 100%; height: auto;. This prevents standard inline 3px baseline descender gaps and sub-pixel rounding inconsistencies across browsers.

To publish a 9-grid profile photo on Instagram, posts enter the feed in reverse order because new uploads shift older posts to the right and down. Uploading tile #09 first (bottom-right), continuing through rows to tile #01 last (top-left) guarantees the final composite displays right-side up.

All graphic manipulation, pixel inspection, transparent tile culling, and ZIP archive packaging occurs strictly inside your web browser's memory using local JavaScript typed arrays (Uint8Array, Blob). No confidential blueprints, artwork, or photos are ever uploaded to an external server.