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This uses the document's own outline to decide where to cut. For anything with a table of contents that is far more useful than splitting every N pages, because the document already knows where its sections begin.

Use it on reports, manuals, statutes, textbooks and scanned books with an outline - anywhere someone needs the chapters as separate files, whether to distribute them individually, to file them separately, or to work on one at a time.

วิธีทำงาน

1. Drop the PDF onto this page. The tool reads its outline.
2. Choose which outline level to cut at. Level 1 gives you top-level chapters; level 2 also splits their subsections.
3. Decide whether output files should be named after their bookmarks.
4. Choose whether to keep the pages before the first bookmark as a separate front-matter file.
5. Press Split by bookmark and download the files individually or as a ZIP.

A section runs from its bookmark to the next bookmark at the same or a shallower level, not to the next bookmark of any depth. That distinction is what makes level 1 give you whole chapters including their subsections, rather than cutting every time a sub-heading appears.

Pages before the first bookmark belong to no section. Title pages, copyright notices and tables of contents usually live there, and dropping them silently would be a strange thing to do, so by default they become their own front-matter file. You can discard them instead.

Naming files after their bookmarks makes the output immediately usable, and the names are cleaned of characters that Windows and macOS reject in file names. Each is prefixed with a zero-padded number so the chapters stay in order in the file listing.

If the document has no outline at all, the tool says so and points you at Split PDF instead, rather than producing a single file and letting you wonder what happened.