It's easy to convert an image file such as JPG to PDF. Just drag and drop your file into the tool above, then download the converted PDF. Use the tool again to convert another image file. You can then merge the PDFs into a singular PDF file when you try Adobe Acrobat Pro DC for free for seven days.
Acrobat Pro DC for Mac or Windows provides a complete set of PDF tools. You can edit PDFs, edit scans with OCR, merge PDFs, organize and rotate PDF pages, add files to a PDF, split PDFs, reduce the file size, insert watermarks, and convert PDFs to and from image formats and Microsoft Word, Excel, and PowerPoint documents.