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What is a XOJ file?
A XOJ file is a notebook created in Xournal, a free, multi-platform notetaking application. It contains the pages of a Xournal notebook. XOJ files may include text, images, highlighting, and other annotations.
Xournal is a notetaking application, available for Linux and Windows, that simulates a real-life notebook. Xournal users can take notes, doodle, insert images, and even highlight and annotate their text, just as they would when using a real notebook.
Each Xournal notebook (which may consist of any number of pages) is saved within a XOJ file. If Xournal users want to share their notebook(s) with another Xournal user, they can do so by giving that user their XOJ file(s).
NOTE: XOJ files can also be opened in Xournal++, a cross-platform variant of Xournal.
How to open a XOJ file
You can open a XOJ file in either Xournal (Linux, Windows) or Xournal++ (cross-platform), both of which are available as free downloads. In either program, select File → Open from the program's menu bar to open your XOJ file.