Appending a a file to an existing PDF is done just like you would do to create a PDF or create an image.

Open the file you want to append in its default application. After you have opened the file and printed it to the PDFtypewriter Printer Driver, the PDFtypewriter Printer dialog will appear.

Click APPEND TO PDF, instead of CREATE PDF as you do to create a PDF.

Please see Creating a PDF if you are having trouble getting to the Append to PDF dialog point.

After clicking APPEND PDF, the above save dialog will appear.

Select an existing PDF that you want to append the output to.   Click the SAVE button.

Once you click SAVE, a PDF for the printer output will be generated.   It will then be appended to the PDF file that you selected to append to.

Please note, doing this has the unlikely possibility of damaging the original PDF file.   We recommend that you backup your PDF file (as you should back up all important files on your computer).   This function will work with all pre-existing PDF files (provided that there are no errors in the original PDF).   To ensure help best results, try to only use the append option with PDF files that were originally made with PDFtypewriter.