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 FOCUS (You may not be familiar with these programs, but the name means that it is a focus for a particular topic.) The main thing here is to choose the target text of you interest. When you do ’to read the results’ you read your choice of subject that is highlighted by your choice, and you can move your cursor over it to choose it. By the way, this works also with text in graphics files (or text and graphics in the same file). It is not necessary to save the file in this context. You also have the option to choose the default text that is displayed when a window is maximized. You can see the default text when minimized or expanded. When you select the first time, the program will open in the open dialog box in your default browser. (For Firefox as well as Internet Explorer.) It will automatically.