This feature allows you to generate one single PDF file from documents( different than PDF) or image files like JPG, BMP, PNG and others – convert to pdf and merge.
In order to merge a few PDFs into one file use function on the page:
https://www.konwerter.net/en/mergepdf/
Protect your data – go to the encrypted site: https://www.konwerter.net/en/ConvertToPdfAndMerge/