1. Open the Extreme PDF editor in the blank space of the toolbar. Generally, a bookmark will be automatically generated on the left side of the software when it is opened. If you want to add a new bookmark, you can add the desired bookmark by clicking the "New Bookmark" option on the left side of the software.

2. Click right mouse button. If you need to bookmark a page, you must first slide to the page and then add it.

3. Tick "Bookmarks" to display bookmarks by default when you open the document again. If the bookmark is unexpectedly closed, you can use this method to open it again.

Extended data:

Bookmarks in PDF can be nested. The new bookmark will have the same nesting level as the previously selected bookmark. If the new bookmark is the first bookmark in the document, it will be placed at the root level.

In addition, bookmarks originated in the Spring and Autumn Period and the Warring States Period and were made of bamboo pieces. Bookmarks are even more useful when scroll books become folded books. After the Song Dynasty, more and more attention was paid to bookmarks, and sometimes sentences such as aphorisms were handwritten on bookmarks.

In addition, today's bookmarks are also printed with poem aphorisms, celebrity aphorisms and decorative pictures. Bookmarks with books echo the traditional aesthetic principle of China, just like wearing a suit and tie, a book with bookmarks is a complete book.