Overview
Splitting is for when one PDF is too much: extract a single signed page, send only the appendix, or break a 200 page manual into chapters.
You choose page ranges. The tool writes new PDFs locally. That is safer than uploading a full personnel file to a website just to peel off page 3.
Ranges are inclusive and numbered from 1 as shown on the page. Off by one errors are the usual mistake. Preview the first and last page of each range before you share.