Free · Private · In your browser

Split by BookmarksLite

Lite: enter page ranges manually to split (full bookmark parsing is limited client-side).

Drop your files here, or click to browse
Processed on your device — nothing is uploaded

How your files are handled

We built these tools so you never have to wonder where your documents go. Here is exactly what happens when you use them.

  • Your files are processed entirely in your browser using open-source libraries (pdf-lib, PDF.js, and others).
  • Nothing is uploaded to our servers. We have no backend that receives, stores, or scans your documents.
  • We cannot see, store, or access your files — not during processing, not after, not ever.
  • Processing uses your device's memory and CPU. Large files may take longer, especially on phones and tablets.
  • All tools are free with no paywall tricks, no hourly task limits, and no watermarks on your output files.

How it works

Three simple steps. Your files never leave your device, and the result downloads straight to your computer or phone.

Frequently asked questions

Common questions about privacy, pricing, and how these tools work.

More organize tools

Other free PDF utilities that work the same way — private, in-browser, no sign-up.

How to split by Bookmarks

Split by Bookmarks divides a PDF into separate files based on its built-in bookmarks (the document outline). It is a fast way to break a report or book into its chapters or sections.

  1. Add a PDF; it is parsed in your browser and never leaves your device.
  2. The tool reads the top-level bookmarks and lists each section with its page range, so untick any you do not want.
  3. If the PDF has no bookmarks, type page ranges manually instead, one range per line.
  4. Click Split PDF and download a ZIP with one file per section.

Good to know: Uses top-level bookmark page ranges.

Everything happens in your browser — your file is never uploaded, and there is no sign-up, watermark, or limit.

Frequently asked questions

Are my files uploaded to a server?

No. Every tool runs entirely in your browser using open-source libraries, so your file is processed on your own device and is never uploaded. We have no backend that receives, stores, or scans your documents.

Is it really free, and will there be a watermark?

Yes. There is no account, no sign-up, and no hourly limit, and the tools never add a watermark to your output. UnboundPDF is free and is not affiliated with Adobe.

Does it work on a phone or tablet?

Yes. The tools run in any modern mobile browser as well as on desktop. Because the work uses your device's own memory and processor, very large files simply take longer on phones.

Which bookmarks are used to split?

The top-level (outline) bookmarks define the section breaks; each section runs from its bookmark's page up to the page before the next one.

What happens if my PDF has no bookmarks?

The tool detects that and switches to a manual mode where you type the page ranges yourself, one range per line.