OneClickPDF

How to Split a PDF by Bookmarks (Chapters)

Last updated: February 24, 2026

Ebooks, technical manuals, and long reports often include a bookmark outline (table of contents) that marks each chapter or section. OneClickPDF can automatically split the PDF at each bookmark, giving you individual files for each chapter — with zero manual page counting.

Step-by-Step Guide

1

Open the Split by Bookmarks tool

Go to the Split by Bookmarks page on OneClickPDF.

2

Upload your bookmarked PDF

Drop the file onto the upload zone. The tool detects and displays the bookmark tree.

3

Choose your split level

Select which bookmark level to split at — top-level bookmarks only (chapters), or include sub-levels (sections within chapters). Preview how many files will be produced.

4

Split and download

Click Split. Each bookmark section becomes a separate PDF file, named after the bookmark title. Download all files in a ZIP.

Split by Bookmarks

Automatically split a PDF at each bookmark or chapter.

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Frequently Asked Questions

What if my PDF doesn't have bookmarks?
The tool requires an existing bookmark outline. If your PDF lacks bookmarks, use our Edit Bookmarks tool to add them first, or use Split by Text to split at chapter headings instead.
Can I choose which bookmark level to split at?
Yes. You can split at the top level only (e.g., chapters) or include deeper levels (e.g., sections within chapters). This controls how granular the split is.
How are the output files named?
Each file is named after its bookmark title (sanitized for filesystem compatibility), making it easy to identify which section each file contains.
Does it preserve bookmarks within each split file?
Sub-bookmarks within each section are preserved in the individual files, maintaining the navigational structure.

Bookmark-based splitting is the cleanest way to divide structured documents. No manual page counting — the tool uses the document's own outline to find the perfect split points.

Conversion guides →Tool comparisons →

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