The classic situation is the same for everyone: you photographed a document, a receipt or a signed form with your phone, and whoever needs it wants a PDF. Here the photos become a single document instead of six scattered attachments.
You can choose between two settings. Fit to image creates pages with the same shape as the photo, with no borders: it is the right choice for photographs and screenshots. A4, portrait or landscape, centres the image on a standard page with a white margin, which is what you need when the PDF has to be printed or filed.
JPG, PNG and WebP are supported. The images are placed in the document at their original resolution.