Split PDF by size, bookmark or text
Break a PDF wherever a size limit, a top-level bookmark, or a text match starts.
Runs on your device. The file is never uploaded.
Split PDF by size, bookmark or text cuts a document into parts. Size mode opens a new file when the next page would push past 500000 bytes. Bookmark mode cuts at each top-level outline entry, text mode before any page holding your string. Page text is joined with a space between runs, so a phrase straddling two never matches.
Questions
What are the three modes?
Size cuts a new file whenever the next page would push it past a byte limit. Bookmark cuts at every top-level bookmark, which is how you split a report into its chapters. Text cuts before any page containing a string you give, case-insensitive, useful for "Invoice" or "Chapter".
Will the size mode hit my limit exactly?
It stays under it, page by page: a page is added while the file still fits, and starts a new file when it would not. A single page larger than the limit still becomes its own file, because a page cannot be divided.
What are the parts named?
In bookmark and text mode, after the bookmark or match, sanitised to safe filename characters and capped at 60. In size mode, a three-digit counter on your original name.
What if there are no bookmarks or no matches?
It refuses rather than handing back a copy of your file. Bookmark mode says "this PDF has no bookmarks/outline to split on", or that its bookmarks point at pages the tool cannot resolve. Text mode says no page contains the string you gave. A silent one-file result would look like the tool ran and found nothing to do.