Image Grid
Add a grid to your image with this free online tool. Choose rows or columns for square cells, set both independently for rectangular cells, or set the square size in pixels. Adjust the alignment, line colour, line width and optional border, then save your image as PNG.
Your image stays in your browser: no upload or account is required.
The grid starts at the selected edges, with partial squares at the opposite edges. Horizontal alignment has no effect with a whole number of columns; vertical alignment has no effect with a whole number of rows.
Choose square cells, or set rows and columns independently for rectangular cells. Your image is processed and stored locally in this browser so it can be restored after reloading. It is not uploaded to the server.