how to split a pdf

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The three reasons people split PDFs

You have a 120-page PDF and you only need chapter 4. Or a 30-page contract where pages 12-13 are the only signed ones and the rest is draft. Or a report that’s too big to email. Splitting a PDF is usually faster than it looks, but only if you know which mode you want and what you’re about to lose in the process. Here’s what actually matters.

Page ranges vs one-per-page

First, extracting one section out of a larger document — a chapter from a textbook, an appendix from a report, a statement month from a yearly bundle. Second, separating signed pages from drafts, so the countersigned version ships clean without the negotiation history. Third, cutting a file down to get under an email attachment limit (Gmail’s 25MB is the usual wall).

What splitting preserves

Each of these wants a slightly different split mode, which is where people trip up.

What you lose

The page content, embedded fonts, images, and text layer (important for searchability) all survive cleanly. Annotations and highlights on the pages you keep come with them. Internal links that happen to point within the range you kept will still work.

Splitting by bookmark (structured splits)

Global bookmarks — the sidebar table-of-contents that lets you jump to chapters — usually get stripped or reduced to only the ones that fall inside your range. Internal links that point to pages you cut will turn into dead links. Digital signatures on the original file are invalidated the moment you split, which is expected; the signed bytes no longer match.

Splitting for email size

If bookmarks matter (textbook, long report you’ll keep referencing), decide before splitting whether you care. If you do, keep the full file and extract a range only when sharing.

A quick workflow for one-off splits