On a Apple computer, the “Print” function of the “Preview” app includes the choice for printing the open file to PDF. This works for converting various picture formats to PDF. In fact, any open printable file can be printed as a PDF. If your objective is to make a PDF into a searchable PDF, Pdf To Excel Conversion works. There are some “free” software listings on the Internet, but I can’t suggest one or another. On a Apple computer, if you just want to merge two or more PDF files, click theft-most icon above the main PDF window. There’s dropdown with several choices. The second is to open “thumbnails”. Click it; you get thumbnails of every slide in your PDF file. Do this with both of the files you want to merge. Drag thumbnails from one file to the other - in the order you choose. You now have the merged file. (This is probably identical in the Windows operating system.) HTH
OR-PYTHON FILE MANAGER This is a native Python script. On the most recent versions of the Python programming language, it will not require a special package for installation and function. To get to start, run the script in command or Run mode using the python or Conda command-line tools. Or, as of February 2014, with pip installed on your system via pip. Once the script starts and the process starts, you will need to enter in your PDF document name, page numbers, and a filename, then press Run to run the operation. At its completion, it presents you with a screen with some statistics about the operation, plus information on the file you used to process the PDF. Hthor-Python will allow you to import, export, and import PDF files and also support converting PDF to PDF, making a file searchable, etc. Click a function, and it allows.