What each comma-separated group actually means#
Each group separated by a comma becomes its own, separate downloadable PDF — "1-3, 5, 7-9" produces three files: pages 1 through 3 in one, page 5 alone in another, and pages 7 through 9 in a third. This is different from a tool that lets you select a scattered set of individual pages to keep in a single output file; this tool is specifically for splitting one document into several standalone pieces.
Why the range check happens before anything is extracted#
Every range in the list is validated against the PDF's actual page count before any splitting starts — asking for pages 7-9 out of a 5-page document is caught and reported clearly, rather than silently producing an empty or broken file, or extracting only whatever pages happened to exist. If one range in a longer list is invalid, nothing is generated until it is fixed, so you never end up with a partial batch of correct outputs alongside one that silently failed.
The extraction happens locally, page structure intact#
Splitting works by copying the specified pages, structurally, into new PDF documents — the same underlying mechanism this site's Merge PDF tool uses in reverse. Nothing is rasterized or re-rendered, so the extracted pages keep the exact quality, fonts, and embedded content of the original, and none of it is ever sent to a server to be processed.