Turn a single picture into a nine-grid montage — the classic 3×3 layout that fills a whole row on Instagram, WeChat Moments or a Xiaohongshu post. Your image is first center-cropped to a perfect square, then sliced into nine equal tiles numbered in reading order so you know exactly which piece goes where. Post them together and the app rebuilds one big seamless image across the grid of a profile or feed.
The cropping and slicing are done tile by tile on an HTML canvas right in your browser, and each piece is exported with canvas.toBlob — your photo is never uploaded to any server, so it stays completely private. Files up to 20 MB are supported and every tile downloads as a PNG.