Some might suggest you download an app to convert a picture to a PDF on the iPhone, but the truth is you can do it for free without any apps.

When it comes to converting file extensions on your iPhone, don't worry about downloading a third-party app when you can make the changes yourself.

Converting images into PDF files is practical if you want to merge several images into one PDF or save a single image professionally. Whether for printing, sending, or archiving — the PDF format is ...

From the Files app that comes with iOS, for example, you can convert images into PDF files by long pressing on them and choosing Create PDF from the menu that comes up.