One JPEG per page, exactly as it was
This tool places each JPG on its own PDF page and embeds the original JPEG data without recompressing it. The only choices you make are which files to include and in what order.
Every image becomes a page sized to its own pixel width and height, with the picture filling the page edge to edge. There are no margin, orientation or paper-size settings, so what you get is a straight wrap of your photos in a PDF container. You can add up to 50 .jpg or .jpeg files in one run. Drag the entries in the list to reorder them; the result downloads as a single file called images.pdf.