How to split a PDF at chapter bookmarks
Split at supported top-level bookmark destinations. Learn the available controls, a practical example and what to check.
Open Split by chapters →Follow these steps
- Open a PDF containing top-level bookmarks.
- Export a ZIP split at supported bookmark destinations.
- Extract and inspect the first and last page of every chapter.
What this tool actually does
The splitter uses bookmark destinations, not headings printed on the paper. A visible table of contents is not the same as the document outline available in a reader sidebar.
Choose the controls for your document
Inspect the top-level outline and its destinations before splitting. After inserting or removing a page, check chapter boundaries again instead of relying on old printed page numbers.
Before your first export
For the manual example, compare every chapter filename with its first heading. A bookmark can point to a title page before the actual chapter; keep that opening page when it belongs to the section.
No top-level bookmarks are reported
Open the outline in a reader. Nested entries, remote destinations and an image of a contents page may not supply supported local boundaries. Use explicit Split ranges when necessary.
A checked example you can try
Alpha and Delta boundaries produce two readable chapter files.
Settings used in this engine check
- quality
- compact
- angle
- 90
- margin
- 20
- start
- 1
- columns
- 2
Check the result
Bookmarks without local page destinations cannot define boundaries. Nested bookmarks are not chapter boundaries. Page copying can remove editable forms; flatten them explicitly first.
Keep the original. When this task produces a file, reopen the download in the application where you will use it and inspect the affected pages. An illustration explains the operation; it is not a recorded processing test.
Practical tips
- Inspect the top-level outline and its destinations before splitting. After inserting or removing a page, check chapter boundaries again instead of relying on old printed page numbers.
- Open the outline in a reader. Nested entries, remote destinations and an image of a contents page may not supply supported local boundaries. Use explicit Split ranges when necessary.
- Compare its first page with the source bookmark destination. Remove ambiguous duplicate boundaries or create a clean outline before repeating the split.
Questions
No top-level bookmarks are reported?
Open the outline in a reader. Nested entries, remote destinations and an image of a contents page may not supply supported local boundaries. Use explicit Split ranges when necessary.
A chapter begins on the wrong page?
Compare its first page with the source bookmark destination. Remove ambiguous duplicate boundaries or create a clean outline before repeating the split.
Can I split a PDF without bookmarks?
Use Split with explicit page ranges or add bookmarks first.
Are nested entries used?
No. Only supported top-level local destinations define chapters.