Your training book is 400 pages and 12 chapters. Sending the whole thing for module one is overkill — participants need chapter 1 today, chapter 2 next week. You want a clean chapter-per-file split.
Flint handles this two ways depending on whether your PDF has bookmarks.
Best case: bookmarks exist
If the PDF has a chapter outline (most do), open split PDF, choose 'split at bookmarks', pick level 1 (chapters). Flint reads the bookmark tree, splits at every top-level entry, and names outputs after the bookmark text. 'Chapter-01-Introduction.pdf' all the way through. Zero manual work.
No bookmarks: specify ranges
If your PDF lacks bookmarks (often the case for older scanned books), find the page each chapter starts on — open in any reader and check the table of contents. Then in split PDF range mode, type '1-32, 33-67, 68-110, ...' for the 12 chapters. Tedious but precise. You only do it once.
Add bookmarks first as a one-time investment
If you'll be splitting this book again — or if other people will — add proper chapter bookmarks once using edit PDF. Future splits use the bookmark method, and readers benefit from navigation in the source file too. About 10 minutes for a typical book.
Naming and ordering for distribution
Use 'Chapter-01-Title.pdf' format so files sort correctly and recipients can identify them. If a chapter is too big to email after splitting, compress it. If a chapter needs further breakdown into lessons, run a second split on it.
FAQ
What if chapters have very different page counts?
Doesn't matter — Flint splits at the exact boundaries you specify. Outputs vary in length to match the source.
Can I include a cover page in each chapter file?
Add to the range. If your cover is pages 1-2 and chapter 1 starts at page 3, set chapter 1 range as '1-2, 3-32' to include the cover.
Bookmarks point partway through a page. What happens?
Split happens at the page level — the page containing the bookmark goes to the new file.
Does each chapter file keep its own page numbering?
Original page labels are preserved per chapter. Chapter 5 will still show page 110 (its original number), not page 1.
Twelve clean chapter files in a minute. Split into chapters.