PDF versions

When creating or optimizing PDFs, you can choose which PDF version to use by selecting a compatibility option (a version from 1.3 to 1.7). The latest version includes all the newest features and functionality. Generally, it’s recommended to use the most recent version (in this case 1.7) unless you are required to use a backward compatibility. Your choice does not affect the functionality in the generated PDFs if they are processed in Foxit PDF Editor, which is designed based on version 1.7 and supports all the functionality of each version. If processed in non-Foxit PDF applications, the generated PDFs may have differences in some of the PDF functionality when you choose different versions. For the details about the differences, see Help or related documentation for the corresponding application.