How to Split a PDF by Chapter Using Its Bookmarks

A long PDF — an ebook, a manual, a report with clear sections — is often easier to work with as one file per chapter rather than one long document. The fastest way there is using the bookmarks the PDF already has to find where each chapter starts.

Find each chapter's starting page first

Most PDF readers show a document's embedded bookmarks or table of contents in a sidebar panel — look for a "Bookmarks," "Outline," or list-icon button in whatever PDF viewer you have open (Preview's sidebar, Adobe Reader's bookmarks panel, or Chrome's built-in PDF viewer all have one). Click through the chapter list and note the page number each one lands on — that's the page each chapter's range starts at.

Split each chapter out

1. Open Split PDF.
2. Drop in the PDF.
3. Choose Extract a page range.
4. Enter the first chapter's starting page as "from" and the page right before the next chapter starts as "to."
5. Download that chapter, then repeat steps 3–4 for each remaining chapter, adjusting the range each time.

Each pass downloads one chapter as its own PDF, named after the original file — rename them afterward if you want the chapter title in the filename instead.

If you'd rather keep it as one file, reorganized

Splitting into separate files works well for chapters you'll reference or share independently. If the goal is just cleaning up or reordering sections within a single document instead, Organize Pages shows every page as a thumbnail you can drag into a new order, which can be a better fit than a full split when you're not actually trying to end up with separate files.

Putting chapters back together

If you split more chapters than you needed, or need to recombine a subset into one file, Merge PDF stacks them back into a single document in whatever order you drop them in.

FAQ

Does Handybin read a PDF's bookmarks automatically to split it? Not automatically — this workflow uses your PDF viewer's bookmarks panel to find the page numbers, then Split PDF extracts each range manually. For a document with a handful of chapters, that's usually faster than it sounds.

What if the PDF doesn't have bookmarks at all? Use the table of contents page instead, if there is one, to note each chapter's starting page number — the rest of the process is identical.

Can I split by bookmark level, like sub-sections within a chapter? Yes, if the sub-section also has its own page number in the outline — the range-extraction step works the same regardless of how fine-grained the sections are.