While there are a variety of PDF apps for iPhones available — Adobe Acrobat being the most well known — you can just use Apple’s Files or Notes.

Create / Edit Notes and Documents : + Create documents in open standard html format which can be opened or edited in any standard word processor like Microsoft Office, Pages or Open Office.

Figuring out how to convert Apple Notes to PDF is not as complicated as it may sound. Notes is one of Apple's built-in apps that comes included with every Cupertino's product. And it's a good ...