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Use a document's own outline as the cut list. Reports, manuals, theses and ebooks usually carry bookmarks marking each chapter or section, and those markers are exactly where you would want to split. Each top-level bookmark begins a new file that takes its name from the bookmark, so you get readable filenames instead of part-01, part-02. Runs entirely in your browser.
To split a PDF by bookmarks, cut it wherever a top-level bookmark begins. On ihatepdf, select a PDF that has an outline and each top-level bookmark starts a new file, named after that bookmark — so a book becomes one PDF per chapter. Anything before the first bookmark is kept as a separate front-matter file so no pages are lost.
Splitting a long document by page number requires you to first find the page numbers, which means paging through the file writing down where each section starts — the tedious part of the job, and the part where mistakes creep in. If the document has an outline, that work is already done: whoever produced the PDF recorded exactly where each chapter begins, and those positions are stored in the file. Reading them out and cutting there is both faster and more accurate than any manual pass, and it produces files named after their actual contents rather than a numbered sequence you then have to rename.
Bookmarks are common in anything produced by a publishing or documentation pipeline: technical manuals, academic theses, annual reports, standards documents, government publications and most commercial ebooks. They are usually absent from scanned documents, which have no structural information at all, and from short files exported straight out of a word processor without heading styles applied. If your file has no outline, a repeating section heading is often the next best cut marker — Split by Text will find every page carrying that phrase and start a new file at each one.
Splitting a long document by page number means first finding the page numbers — paging through the file writing down where each section starts. That is the tedious part of the job and the part where mistakes happen, and it has to be redone every time the document is revised. If the file has an outline, that work is already recorded: whoever produced the PDF marked exactly where each chapter begins, and those positions are stored in the file itself. Reading them out and cutting there is faster and more accurate than any manual pass, and it produces files named after their actual contents rather than a numbered sequence you then have to rename by hand.
Bookmarks are standard in anything produced by a publishing or documentation pipeline: technical manuals, academic theses, annual reports, standards documents, government publications, and most commercial ebooks. They are usually absent from scanned documents, which carry no structural information at all, and from short files exported from a word processor without heading styles applied. A quick way to check before you start is the sidebar in any PDF reader — if a navigable chapter tree appears there, this tool will find it. If it does not, Split by Text on a repeating heading is the usual fallback.
The three documents this gets used for most all share a shape: long, structured, and needed in pieces by different people. A dissertation gets split so each chapter can go to a different reviewer, or so the methodology can be submitted separately. A technical manual gets split so the installation section can ship with the hardware while the maintenance section goes to service engineers. An annual report gets split so the financial statements can be filed on their own. In each case the chapter boundaries are already recorded in the outline and the filenames that come out are already meaningful, which is the difference between a two-minute job and an afternoon of manual page ranges.
The tool tells you plainly that there is no outline to split on, rather than silently returning the whole file. Use the main Split PDF tool to cut by page range instead, or Split by Text if a repeating heading marks each section.
No — only top-level bookmarks. In a typical book that gives one file per chapter rather than one per sub-section, which is almost always the intent.
They are kept as a separate "front matter" file. Title pages, copyright pages and tables of contents often sit before the first chapter bookmark, and discarding them silently would lose real content.
Each file is named after its bookmark, prefixed with a sequence number so the chapters stay in order in a file listing. Characters that filesystems reject are replaced automatically.
The pages are copied intact, but the outline itself is not rebuilt inside each part. Each output is a plain PDF of that chapter's pages.
Yes, if it is a PDF with an outline. For EPUB files, convert first with the eBook to PDF tool. Note that DRM-protected files cannot be opened by any browser-based tool.
No. The outline is read and the files are built entirely in your browser.
You are told so plainly rather than being handed back the whole file. Use Split PDF to cut by page range, or Split by Text if a repeating heading marks the start of each section — in a document without an outline, a consistent chapter heading is usually the next best cut marker.
No — only top-level bookmarks are used as cut points, which in a typical book gives one file per chapter rather than one per sub-section. If you need to split at a deeper level, the practical route is to split by chapter here first, then split each chapter again.
Yes. Every top-level bookmark is listed with its page range and can be individually included or excluded, so you can extract three chapters out of forty without producing thirty-seven files you do not want.
They are kept as a separate front matter file. Title pages, copyright notices and tables of contents typically sit before the first chapter bookmark, and silently discarding them would lose real content.
After their bookmarks, prefixed with a sequence number so chapters stay in order in a file listing. Characters that filesystems reject are replaced automatically, so a chapter called "Results: 1998/99" produces a usable filename.
The pages are copied intact but the outline is not rebuilt inside each part, so each output is a plain PDF of that chapter’s pages.
If it is a PDF with an outline, yes. Convert EPUB files first with the eBook to PDF tool. DRM-protected files cannot be opened by any browser-based tool.
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