What are bookmarks in a PDF?
Bookmarks, also known as PDF's Document Outline feature, provide a convenient way to navigate through a PDF document. They act as a table of contents or an interactive index that lets users quickly jump to specific sections, pages, or points of interest in the document.
Bookmarks are usually shown in a separate navigation pane, making it easy for users to open different sections of a PDF without extensive scrolling or searching.
Note that bookmarks are technically different from headings in the document content. While headings are part of the document structure and help organize the text, bookmarks are an additional navigation tool that improves how users move through the document.
The way bookmarks work and look can vary depending on the PDF viewer or editor. Users can usually expand or collapse bookmark levels to create a hierarchy for easier navigation. By clicking a bookmark, users are taken directly to the linked section or page.
For more detailed technical information about bookmarks, see clause 12.3.3 in ISO 32000-2:2020, the International Standard for the Portable Document Format (PDF). This standard provides detailed guidelines and specifications for PDF documents, including the definition and behavior of bookmarks.
