Phone photos of receipts, whiteboards and signed pages are the new scanner. JPG to PDF places them on pages — fit-to-image, A4, or Letter.

Drop several JPGs; the PDF keeps that order. Mix PNG screenshots with photos. Then Compress if an email gateway rejects the size.

Scan to PDF is the same idea with a live camera. Use that when the document is in front of you; use JPG to PDF when the photos already exist.

No watermark is printed on the page. If you want a mark, that is a different tool: Watermark PDF.