JPG to PDF
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A PDF is the right wrapper when several images have to travel as one document — a set of receipts, a passport photographed front and back, a signed page you photographed rather than scanned. Each image becomes a page, in the order you set.
How to turn JPGs into a PDF
JPEGs are embedded into the PDF byte for byte rather than being decoded and re-saved, which matters more than it sounds: a photo goes in at exactly the quality it arrived with, and the PDF ends up roughly the size of the photos added together. Anything that is not a JPEG — a PNG screenshot, a WebP — is drawn as lossless pixels so its transparency and sharp edges survive. If the result is too big for an email, the margin and page size do not help much; run it through the PDF compressor instead.
Questions
No. JPEGs are copied into the PDF untouched, so what you see is exactly the original file.