Wirelessly Download a file explorer app such as ES File Explorer, Astro File Manager or the simply-named Android File Manager to your Android. Launch the app and find the PDF on your phone.

You can also use Microsoft Office to convert pictures to PDF files on Android. Now, you can send the PDF file to anyone or, you can also access it from any other device via OneDrive.

This can be downloaded for free from the Google Play Store and works by converting images to PDF, Word, or PowerPoint files which can be saved to OneNote, OneDrive, or your phone.