Macworld You can turn any type of document into a PDF on iPhone in seconds, and since the functionality is built into the Share option you don’t need third-party apps to get started. Here’s how to convert to PDF on iPhone or iPad. For most documents (web pages and more) you can chose the Markup option: Tap the Share button.Choose Markup.You can draw or write on the PDF, or just tap Done.Choose Save File To… and select the location and filename for your PDF.Foundry Some file types, like images, don’t give you the Markup option. For those, you can use the print preview to create and save a PDF: …