Photographing a document is quick. Sending someone fourteen separate images is not. Here is how to turn them into a single PDF that opens and prints like a real document.
Crop out desks, hands and unrelated papers before combining photos. A contrast adjustment can improve legibility but cannot reliably remove shadows or recover blurred characters; retake unreadable pages in even light.
Images to PDF puts one photo on each page. Choose A4, Letter or fit-to-photo size, orientation and margins, then arrange photos using the arrows. The first-page preview is not a check of the whole document: save images.pdf and inspect every page.
The resulting PDF contains page images, not searchable text. Image to text can separately recognise English text and export it as TXT; it does not add an OCR text layer to this PDF.
JPG photos are placed into the PDF exactly as they are, without being compressed again. That keeps their quality, and it also means the PDF is about as large as the photos you put in. Ten phone photos at 4 MB each will make a PDF of roughly 40 MB.
To make it smaller, shrink the photos first with Compress image, to a width of about 1920 pixels, and then build the PDF. That is far better than compressing the finished PDF, which would turn the pages into pictures a second time and make them softer.
Make images.pdf here first, then combine it with the existing documents in Merge PDFs.
Available memory varies. Use smaller photos or smaller batches if processing fails; there is no performance guarantee.
Each photo is embedded as it is, so the PDF is about the total of the photos. Make the photos smaller with Compress image before you build the PDF.