Upload a PDF and pick the output sheet size. The tool places four consecutive pages in a 2x2 grid on each portrait sheet, scaling each to fit, and downloads the result.
4-up puts four document pages on one physical sheet in a two-by-two grid — ideal for overviews, thumbnails and saving paper.
Reading order: top-left, top-right, bottom-left, then bottom-right, filling each sheet before starting the next.
The last sheet is filled with as many pages as remain; the empty grid cells are simply left blank.