How to split a long PDF into equal chunks without typing out every page range

Splitting a PDF by custom page ranges — "1-3,5,7-9" — works well when the sections are irregular and you actually know where they fall. It's the wrong tool for a 200-page scanned book you just want broken into 20-page batches, where typing out ten separate ranges by hand is its own tedious task.

Two different splitting problems

"Split at these specific points" and "split into equal pieces" are different enough problems that Split PDF now has two separate modes rather than forcing the second case through range syntax. Custom ranges are still there for the first case — pulling out a specific chapter, or separating an exhibit from a contract.

Splitting every N pages

Switch to "Every N pages" mode, enter how many pages each output file should have, and the document is chunked into consecutive groups of that size automatically — the last file just gets whatever pages are left over if the total doesn't divide evenly. A 100-page document split at 20 pages each becomes five files, no range typing involved.

Setting it to 1 page per file is also the fastest way to break a document into individual single-page PDFs, without listing out every page number by hand.