Bookmarks (PDF)
A navigable outline inside a PDF — the table of contents that appears in the sidebar of most PDF readers, letting you jump to specific sections.
PDF bookmarks are the navigational outline that appears in the left sidebar of most PDF readers (Adobe Acrobat, Chrome's built-in viewer, Preview on macOS). They let you jump directly to a specific chapter, section, or page without scrolling.
How bookmarks differ from page numbers
A page number is just a location. A bookmark is a named reference with a meaningful label: "Chapter 3: Methodology", "Exhibit B", "Appendix — Financial Statements". Long PDFs without bookmarks are hard to navigate; long PDFs with bookmarks feel like websites.
Bookmarks vs the page navigation
Most PDF viewers offer both:
- Bookmarks / outline panel — the hierarchical table of contents, if the PDF has one
- Thumbnail panel — small previews of each page
- Search / find — full-text lookup
Bookmarks are the fastest way to jump around in a structured long document (books, reports, contracts with labeled sections). Most PDFs generated from Word or LaTeX automatically create bookmarks from heading styles; scanned PDFs rarely have them.
Common tasks
- Adding bookmarks — requires a dedicated PDF editor like Adobe Acrobat (not commonly available in browser-based tools)
- Preserving bookmarks when merging — Merge PDF preserves the bookmarks from each input file in the combined output
- Preserving bookmarks when splitting — Split PDF keeps the bookmarks that reference pages in the extracted range
Browser-based PDF tools are generally stronger on transforming content than on rich authoring like bookmark editing; for complex bookmark work, a desktop PDF editor is usually more practical.