A JPG file is a single image file and a PDF file may have multiple pages. I don't understand why you want to convert multiple PDF files in to a single image file. But it is a normal process to convert multiple JPG images into a single PDF file. All you need is a PDF writer or a PDF printer driver.
And you will need to get used to the following file formats. The JPEG file is supported as a compression format by the following programs: Apple's photo, iMovie, Pixar's Pixelate, Core's Photo Book, Core's PhotoShop, Adobe's PS, Adobe's Photoshop, Adobe's Lightroom and Sony Pictures' EXIF. You should convert a large JPG picture into a smaller version (5200 ) 3000 pixels). JPEG pictures are saved as JPEG or JPEG2000 file format, and they are compressed to 320 ) 250 pixels (9 bit). The best method for converting image files into PDF files is with Adobe's Acrobat Reader. Also, you can use Microsoft Outlook to convert a file from PDF to TIFF format with a single click. If you like the look of a PDF and you want to save the PDF in your computer, you can open any file type in Microsoft Explorer and use it as PDF. If you have other questions, you can leave comments below..