Sending images as PDF files to your Paperless Pipeline account allows you to take advantage of the PDF manipulation features built into Pipeline. There are several mobile apps that can easily email your mobile device images as PDF files to your Pipeline maildrop address.
Many of these mobile apps also allow you to crop and adjust the exposure (brightness & contrast) of the images before sending. The following are two popular apps that you can use to email your mobile device images as PDFs:
You may also search the term "scan pdf" in your mobile device's app store to discover other similar apps.