Merging and splitting are the two most common PDF jobs, and both are quick once you know the options.
Merging
Drop two or more PDFs into the Merge tool, drag them into the order you want, and download a single combined file. The page order follows your upload order, so arrange them before you process.
Splitting
Splitting supports three modes: extract a specific range (e.g. pages 2–5), split into a separate file every N pages, or burst the whole document into one file per page. Multi-file results download as a tidy ZIP.
Reorganising
Need to reorder, rotate, or delete pages? The Organize tool gives you a drag-and-drop grid of every page so you can rearrange the whole document visually before saving.