Create Bookmarks
Add and organize table of contents chapter bookmarks.
Tailored Parameters
Fine-tune exact dimensions, qualities, ranges, or security tokens for this feature.
Instant Local Processing
Zero latency local computation directly in your browser session.
Same-Page Workflow
Re-run operations repeatedly without losing your active tool workspace.
Bookmarks are the navigation panel of a PDF — a clickable outline that jumps to a section. In a long document they are the difference between a reference someone uses and one they scroll through in frustration.
This tool lets you create entries, rename them, nest them into a hierarchy and point each one at the right page.
How it works
- 1Load the PDF. Any existing outline is read and shown.
- 2Build the outline. Add entries, set their titles and target pages, and nest them to express the structure.
- 3Download. The outline appears in the navigation panel of any reader.
When you need it
- Adding navigation to a manual assembled from separate chapters
- Making a long report usable as a reference document
- Preparing a document so it can later be split by outline
- Restoring bookmarks lost when documents were merged
Frequently asked questions
- Are bookmarks the same as the table of contents page?
- No. A contents page is printed content. Bookmarks are a navigation structure shown in the reader's sidebar, and they are what Split by Outline reads.
- Can I nest them?
- Yes, to arbitrary depth, so chapters can contain sections.
- Do they survive merging?
- Generally not — merging does not carry outlines across. Add them after assembling the final document.
- Are my documents uploaded anywhere?
- No. Every tool in PDF41 runs inside your browser tab using WebAssembly and JavaScript. Your file is read from disk into memory, processed locally, and handed back as a download. It is never transmitted to a server, so there is nothing to intercept, retain, or delete afterwards.
- Does this work without an internet connection?
- Yes, once the page has loaded. The PDF engine, fonts and character maps are all served from this site rather than a third-party CDN, so an unstable connection or a locked-down corporate network does not stop the tool from working.
Similar tools to use
Complete your document workflow with these frequently paired tools.
Split by Outline
Divide a PDF by chapters and table of contents bookmark trees.
Organize PDF
Visually sort, reorder, duplicate, delete, and rotate pages across files.
Page Numbers
Add custom page numbers and headers/footers with dynamic tokens.