Extract chapters and sections based on the PDF's bookmark outline.
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File must contain bookmarks (outline)
Long PDFs often carry a table of contents in their bookmarks, and each bookmark marks the start of a chapter or section. Split PDF by Bookmarks uses that structure to cut a document into separate files automatically. It is a Premium feature, and it runs entirely in your browser.
Extracting chapters by hand means flipping through the document, noting where each one begins, and copying page ranges one at a time. For a book with twenty chapters that is a slow, error-prone process. This tool reads the bookmark outline instead, so each section is identified from the document's own structure rather than from eyeballing page numbers.
Bookmarks appear wherever a PDF was created from a structured source. Textbooks, technical manuals, ebooks, and long reports commonly keep their outline when exported, and so do official publications and well-organized whitepapers. The outline is the same navigation list a reader sees in the sidebar of most PDF readers. Because the outline is read from the file itself, the tool works with any PDF that saved its bookmarks, regardless of which reader or creator produced it.
If a PDF has no bookmarks at all, the tool will tell you so directly. That is not a sign of a broken file; it simply means the document was not saved with an outline, and a different splitting method fits better.
The tool reads the PDF's outline, resolves each bookmark to its page, and works out where one section ends and the next begins. Every bookmark becomes its own PDF file, named after the bookmark title, with the pages between one bookmark and the next grouped together. The tool lists the detected bookmarks with their page ranges before you download anything, so you can confirm the split before it happens.
Nested bookmarks are handled as well, so a book with parts and chapters still resolves cleanly. Each entry in the detected list shows the section title and the span of pages it covers, which makes it obvious before you download whether the split matches the structure you expected.
Pro tip
This tool is built for documents that already carry an outline, such as textbooks, manuals, and long reports. If a PDF has no bookmarks, the tool will tell you plainly. Many PDF readers can generate a simple outline from heading structure, which is worth doing before you attempt a bookmark-based split.
Bookmark-based splitting is available to Premium subscribers. It is a natural fit for anyone who manages reference materials, course packs, or multi-chapter publications, where splitting by structure saves far more time than splitting by hand. As with all tools on this site, the processing happens in the browser, so the source document stays private and the chapter files are assembled without ever leaving your machine.