Split by Bookmarks
Split PDF into Chapters and Sections Using Bookmarks
Drag and Drop PDF files here
Fast, 100% private in-browser processing. Your files never leave your device.
Automatically divide a structured PDF into separate files based on document outline bookmarks and chapter headings.
How to use Split by Bookmarks
Upload PDF
Select a PDF that contains bookmark outlines.
Select Bookmark Levels
Choose which bookmark headings to split by.
Download Chapter Files
Export chapters named automatically after their bookmark titles in a ZIP.
Key Features & Capabilities
Automatic Chapter Naming
Output files are automatically named using the title text of each bookmark.
Ideal for Ebooks & Manuals
Effortlessly partition large technical manuals, textbooks, and reports by section.
Local & Private
Bookmark parsing runs client-side with zero cloud uploads.
Frequently Asked Questions
What if my PDF does not have bookmarks?
If your PDF lacks bookmarks, use our Split PDF or Split by Size tools to extract pages.
🔒 100% Client-Side Privacy Guarantee
OM PDF processes all documents entirely in your web browser memory using WebAssembly. Your files are never uploaded to any cloud server, preventing data leakage and guaranteeing total security for confidential documents.