Outlines & Bookmarks

import com.ironsoftware.ironpdf.PdfDocument;
import com.ironsoftware.ironpdf.bookmark.Bookmark;
import com.ironsoftware.ironpdf.bookmark.BookmarkManager;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.List;

// Load an existing PDF from the file system (or create a new one from HTML)
PdfDocument pdf = PdfDocument.fromFile(Paths.get("assets/book.pdf"));

// Add top-level bookmarks to pages of the PDF using their page indices
BookmarkManager bookmarks = pdf.getBookmark();
bookmarks.addBookMarkAtEnd("Author's Note", 2);
bookmarks.addBookMarkAtEnd("Table of Contents", 3);
bookmarks.addBookMarkAtEnd("Summary", 10);
bookmarks.addBookMarkAtEnd("References", 12);

// Retrieve a reference to the Summary bookmark so that we can add a sublist of bookmarks to it.
List<Bookmark> bookmarkList = bookmarks.getBookmarks();
Bookmark bookmark = bookmarkList.get(2);
bookmark.AddChildBookmark("Conclusion", 11);

// Save the PDF to the filesystem
pdf.saveAs(Paths.get("assets/bookmarked.pdf"));

Outlines & Bookmarks

Developers can use the BookmarkManager to add bookmarks to a PDF document. Access the BookmarkManager by calling the getBookmarks method on its PdfDocument.

BookmarkManager bookmarks = pdf.getBookmarks();

BookmarkManager bookmarks = pdf.getBookmarks();

JAVA

In the featured code example, we call the addBookmarkAtEnd method to add four top-level bookmarks (one after another) to the working PdfDocument before saving the modifications to the disk. Opening the modified PDF after executing the above code will show the bookmarks appearing in the order listed below:

Author's Note
Table of Content
Summary
References

The method addBookmarkAtStart can prepend a bookmark, making it appears before other bookmarks if defined previously. For example, the line of code shown below, if it were placed right after Line 16 of the featured code example, would make the bookmark "Foreword" appear before the first item in the list presented previously.

bookmarks.addBookMarkAtStart("Foreword",1);

bookmarks.addBookMarkAtStart("Foreword",1);

JAVA

IronPDF has the ability to recognize bookmarks that have been added to the PDF using other third-party software. This gives the library considerable flexibility in terms of adding and modifying bookmarks in post-rendered PDF documents as required by the business.