If you want to convert multiple PDFs at the same time, you can use batch conversion. Have in mind that you can convert PDF documents only into the same file format.
There are two ways to run batch conversion:
On the Menu bar
Click on the Convert menu and then on Batch Conversion.
On the Toolbar
Click on the Batch icon .
When the Batch Conversion dialog box pops up, click on the Add files button to add PDF files you want to convert at the same time. If you accidentally added a wrong file or you simply changed your mind, click on the file first and then on the button Remove selected.
Output Folder option is to define the location where you want to save the converted files.
Choose the output file type by clicking on the drop down menu Convert to.
Enter captcha and click Convert.