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 Merging Online 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
OW, a Google’site, lets you create searchable PDFs from your web pages. On the open page, click open and choose download as a file type. You get a browser window where you choose the size, format, display and so on; a Google interface for the process. The document contains the source code. A ‑download‟ button links to that file. (A Google’search’site’s page also provides a link to it.) (A Google’site’s page also provides a link to it.) You can search for the exact sequence of words — for instance, search’words’. . You can search for the exact sequence of words — for instance, search’words’. . The same search in Internet Explorer or on a Macintosh also shows the exact sequence of the words in the text. Or, if you use the copy option, the document is copied on the computer itself to show you the exact order in.