Grid image splitter
One image into 3×3 / 2×2 / 4×4 · optionally squared first · everything in one zip
点击选择或拖拽一张图片到此处
支持 JPG / PNG / WebP / GIF（首帧）/ BMP；单张不超过 20MB、5000 万像素；加载时按 EXIF 方向归一化
九宫格怎么切才对：正方形、顺序与画质
朋友圈九宫格是按正方形排布的。微信把九张图放进 3×3 的方格，每格都是正方形。如果直接把一张 16:9 的横图等分成九块，每块也是 16:9 的横条，发出去每格会被裁切或留白，画面就对不上了。所以正确做法是先把整张图裁成 1:1 的正方形，再等分成九块——本页默认就是这么做的（居中裁切），也可以选择不裁（自己确认原图接近正方形）或拉伸（会变形，一般不推荐）。
切图顺序不能乱。发朋友圈时要按「从左到右、从上到下」的顺序选图，九宫格才会拼回原图。本页导出的文件名是「原图名-行-列」，块列表也是按这个顺序排列的，上传时按列表顺序选即可；打包 zip 解开后同样按文件名排序。如果顺序错了，拼出来会是错位的图。
切图不该掉画质。切分本身只是裁剪：从原图上取一块区域画到新画布，不缩放、不插值，PNG 导出是无损的，每块的像素就是原图对应位置的原始像素。只有你主动选 JPG 或 WebP 时才会按设定的质量重新编码一次——体积小一些，但对要发到社交平台的图来说差别不大。要保留最大画质就选 PNG。
为什么这一切不用上传。裁剪与切分是 canvas 的基本操作，浏览器里几百毫秒就能完成；打包用自托管的 jszip 在本地生成 zip。整页没有任何上传接口——旅行照、家人照片、还没发布的素材都不需要先经过别人的服务器。你可以打开浏览器开发者工具的 Network 面板核验：整个流程只有本地文件读取，没有任何提交请求。
FAQ
Nine-grid posts on WeChat Moments, Xiaohongshu and the like are laid out as squares, so an image that is not 1:1, split evenly as-is, comes out distorted or with blank strips. This page turns crop-centered-to-square on by default; you can also crop by ratio or stretch, and the even split happens after that, so every tile is a tidy square.
Rows and columns are each picked from 1 to 6; the common ones are 3×3 (nine-grid), 2×2, 3×1 (a long image in three parts) and 4×4, with a cap of 36 tiles. Tile files are numbered left to right, top to bottom, and the zip bundle keeps that same order.
No. Splitting only crops - no scaling, no re-encoding: PNG stays lossless, and quality settings apply only when you actively pick JPG or WebP. Each tile holds the original pixels of its region, so the higher the source resolution, the sharper each tile.
No. Decoding, cropping, splitting and packing all run in the browser; not one byte of your images leaves the machine, and reloading clears everything. Check the developer tools Network panel - the page makes no upload request at all.