If your PDF already has bookmarks marking its chapters or sections, Split by Bookmarks turns each top-level bookmark into its own separate file automatically — no need to figure out page ranges by hand.
How to split by bookmarks
- 1
Upload your PDF file
Drag it onto the upload area — it needs existing bookmarks to split by.
- 2
Select Split by Bookmarks
Choose the tool once your file has loaded.
- 3
Click Split
Each top-level bookmark becomes its own file, right in your browser.
- 4
Download your files
All resulting files come packaged in a single zip.
Why use RealPDFTool for split by bookmarks
No manual page-range guessing
Bookmarks already mark the boundaries — the tool just acts on them.
Your files never leave your browser
Splitting runs locally, so your document is never uploaded.
Every file, zipped in one download
No downloading chapters one at a time.
Frequently asked questions about split by bookmarks
What if my PDF doesn't have bookmarks?
This tool needs existing bookmarks to work from — if your file doesn't have any, use plain Split PDF to divide it by page range instead.
Does it split by top-level bookmarks only, or nested ones too?
It splits by top-level bookmarks — nested sub-bookmarks stay inside their parent's file.
Is there a page limit?
It runs entirely in your browser, so it's bounded by your device's memory rather than a server-side limit.
Are my files uploaded anywhere?
No — splitting happens locally, so your document is never uploaded.