This tool can help you generate squares or rectangles. It will ask you the width, height, squares per row and total number of boxes.
For example, if you enter width to 48, height to 20, boxes per row to 4 and total boxes 40, it will generate boxes in in the size of 48×20 and 4 boxes will be generated in each row. And overall 40 boxes will be generated. Please note that, you can modify the value. New pages will be created if there are more boxes to fill.
The below image is an example how the grids will be generated.