Grid Image Splitter

📖 What this does

A nine-square post for a feed, a tiled cover for a listing, a long page chopped into sections - cutting one picture into nine equal pieces by hand means working out coordinates in an editor, and the result is usually a pixel off somewhere. This slices it in the browser instead. Pick the rows and columns, and red dashed guides sit on top of the image showing exactly where the cuts land, with a strip of thumbnails below. Once the guides look right, take the whole set as one ZIP, or save them one after another. Three by three is only the common case: rows and columns go from one to twelve, and 1x9 strips and 9x1 columns have their uses too.

✨ Features

• Rows and columns run independently from 1 to 12, with eight common layouts as one-click presets. Where the division is not exact, sizes round to the nearest pixel so you do not get transparent slivers at the edges.
• Two crop modes: split the whole frame keeps every part of the picture; centre square first trims to the short side before slicing, so pieces stay square and a platform will not squash them.
• Guides overlay live - red dashes mark the cuts, a blue box shows what the square crop keeps, and both can be turned off to see the picture clean.
• Numbering runs left to right or top to bottom, with two-digit filenames, so the order survives being imported into a layout tool.
• Pack everything into one ZIP, or use Save all to write the pieces out one by one. The archive is built on the spot and never touches a server.
• Export as PNG, JPG or WebP. Each piece comes out at the resolution of its region of the original; the preview being scaled down changes nothing about the output.

🛠 How to use it

1. Press Choose image or drop a file on the dashed box. Red dashed guides appear on the right immediately.
2. Click a preset, or type your own rows and columns. The line below reports the pixel size of each piece and the total count.
3. For a nine-square feed post, switch the crop to centre square first so every piece is square and the platform will not squash it.
4. Once the guides sit where you want them, press Download ZIP for the whole set, or Save all to write the pieces out in order.
5. If the naming order matters, set it before downloading - filenames follow the numbering you chose.

⚠️ Before you rely on it

• Edges round to whole pixels. When the width or height does not divide evenly, the last row or column differs by a pixel or two. You will not see it, but a strict mosaic may show a hairline seam.
• The square crop discards picture. Trimming to the centre square throws away content at the sides or top and bottom. If your subject sits off-centre, check what survives the crop first.
• More pieces means more waiting. Twelve by twelve is 144 pieces, and packing takes a while during which the page may stop responding. That is expected.
• JPG drops transparency. Transparent areas of the original come out white. Use PNG or WebP when you need the alpha channel.
• Many downloads at once may be blocked. Browsers usually ask permission before allowing a burst of downloads, so prefer the ZIP.