About the Image Splitter
The classic reason to cut a picture into a grid is the three by three profile mosaic, where nine posts assemble into one large picture on the grid view. Puzzle games, print sheets that have to fit an A4 page, sprite atlases and tiled map backgrounds all need the same operation: divide the canvas evenly and export each cell as its own file.
Cut lines are computed from rounded fractions of the full width and height rather than from a fixed tile size, so no column of pixels is dropped and no tile is a pixel narrower than its neighbour by accident. If you ask for more columns than the picture has pixels the request is trimmed to what actually fits, and the report tells you that it happened rather than returning empty files.
Tiles are named by their position, tile-r2-c3 being the third tile of the second row, so the set stays in order when the folder sorts alphabetically. Click any file name to save that tile alone. The Download button builds an uncompressed ZIP in memory and saves the whole set at once, which is quicker than clicking through nine or sixteen links. PNG keeps the exact pixels and any transparency; JPG is smaller for photographs, and the backdrop colour fills anything transparent before encoding. To recombine tiles you will need an editor, since this page only ever cuts. For a mosaic effect rather than separate files, see Pixelate Image.
How to use
- Drop the picture you want cut onto the left pane.
- Set Rows and Columns, using 3 by 3 for a profile grid mosaic.
- Choose PNG to keep transparency, or JPG with a backdrop colour for photographs.
- Press Download for a ZIP of every tile, or click one file name to take a single tile.
Common questions
- In what order should I post a three by three grid mosaic?
- Post the bottom right tile first and the top left tile last. Feeds fill from the top left, so uploading in reverse reassembles the picture correctly.
- Are the tiles all exactly the same size?
- They differ by at most one pixel when the width or height does not divide evenly, because the cut positions are rounded rather than truncated. No pixels are lost.
- What is inside the ZIP file?
- One image per tile at full resolution, stored without compression so the archive is written instantly. The thumbnails on screen are previews only.
- Can I split an image into unequal pieces?
- Not here. The grid is always even. For an uneven cut, split once and then run a tile through the tool again with different numbers.