Three ways to split
By page range is the one you want when the document has a structure: a report whose chapters start at known pages, or a batch scan holding several separate documents. Each comma-separated group becomes its own PDF.
Every N pages suits uniform documents — a stack of double-sided forms scanned in one pass, split back into two-page records.
One file per page is the blunt option, useful when you need to distribute or re-order pages individually.
Splitting is lossless, and non-destructive
The outputs are built by copying page objects, so nothing is re-rendered and no quality is lost. Your original file is never modified — everything happens on a copy held in your browser's memory, and nothing is uploaded.
To combine documents instead, use Merge PDF. To reorder or rotate pages within one document, use Organize PDF. To turn pages into images, see PDF to JPG.