A 240-page contract, three pages to send
You've just received the master services agreement for a new client. The whole document is 240 pages, but the section the legal team is asking about is only on pages 47, 48, and 51. Forwarding the entire PDF would bury the question; copying the text into an email loses the formatting and the page numbers.
You drag the contract onto the page, scroll to the relevant pages, click on each one, and within seconds you have a three-page PDF named contract-extracted.pdf. Page numbers stay correct, formatting is intact, and the email goes out before lunch. The legal team gets exactly the context they need, without a 30 MB attachment they didn't ask for.
That's the whole point: send people the pages that matter, not the haystack the pages came in.
Sharing only the fun parts of the itinerary
You booked a two-week trip and the agency sent a 60-page PDF: contracts, terms, transfers, hotel vouchers, a day-by-day schedule, and a grand list of optional excursions. Your kids don't need any of that. They just want to know what they're doing each day.
You open the PDF, click the daily-schedule pages, and pick "Keep document order". Out comes a tidy six-page PDF you can drop in the family chat. No editing, no screenshots, no awkward "swipe to page 23" instructions. Just the pages they actually care about, in the right order, with the original maps and times.
When you arrive at the hotel and someone asks "what's the plan tomorrow?", everyone already knows.
Submitting only what the application asks for
You've spent weeks preparing the documents for a research grant. The form asks for "pages 12 to 18 of your most recent annual report, plus the financial summary on page 31." Your annual report is an 80-page beast.
You upload it, type 12-18, 31 into the Pages field, and watch the grid mark exactly the right pages. One click, one download, and the PDF you submit contains the seven pages requested, in the order requested, named after the original report. The reviewer sees a tight, focused document instead of an 80-page file with a "see page 12" sticky note.
The grant gets read on its merits, not skimmed because the file was too big to bother with.