When this tool is useful
Separating a report, manual, portfolio, or collected volume whose main sections already have reliable top-level page bookmarks.
How local processing works
The browser follows the existing top-level outline sequence. Every entry must have a title and a supported direct internal destination to a physical page, and those destinations must already be in strictly increasing page order. Valid ranges are copied to separate PDFs, with leading pages placed in a Preface part when the first bookmark starts after page one.
How to use it
- Prepare Split PDF by bookmarks: Work from a copy and confirm the visible top-level outline, each destination's physical page, duplicate boundaries, the leading pages before the first boundary, generated section names, and ignored nested or external entries. Keep every source unchanged.
- Run Split PDF by bookmarks: Process only in this browser. The browser follows the existing top-level outline sequence. Every entry must have a title and a supported direct internal destination to a physical page, and those destinations must already be in strictly increasing page order. Valid ranges are copied to separate PDFs, with leading pages placed in a Preface part when the first bookmark starts after page one.
- Download and verify: Save under a new name. Compare every generated boundary with the source outline, inspect the first and last page of each file, confirm that no physical page is missing or duplicated, and retain the original bookmarks in the source.
Important limitations
Nested child bookmarks are not used as boundaries. A missing outline, or any top-level entry with an external URL, unsupported action, missing title, malformed destination, duplicate page, or out-of-order page, stops the whole operation instead of being skipped, sorted, or guessed. Printed page labels are not interpreted.
Verify the downloaded result
Compare every generated boundary with the source outline, inspect the first and last page of each file, confirm that no physical page is missing or duplicated, and retain the original bookmarks in the source.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
When is Split PDF by bookmarks useful?
Separating a report, manual, portfolio, or collected volume whose main sections already have reliable top-level page bookmarks.
How does Split PDF by bookmarks work?
The browser follows the existing top-level outline sequence. Every entry must have a title and a supported direct internal destination to a physical page, and those destinations must already be in strictly increasing page order. Valid ranges are copied to separate PDFs, with leading pages placed in a Preface part when the first bookmark starts after page one.
Which limits require attention?
the visible top-level outline, each destination's physical page, duplicate boundaries, the leading pages before the first boundary, generated section names, and ignored nested or external entries. Nested child bookmarks are not used as boundaries. A missing outline, or any top-level entry with an external URL, unsupported action, missing title, malformed destination, duplicate page, or out-of-order page, stops the whole operation instead of being skipped, sorted, or guessed. Printed page labels are not interpreted.
How should I verify the result?
Compare every generated boundary with the source outline, inspect the first and last page of each file, confirm that no physical page is missing or duplicated, and retain the original bookmarks in the source.