Mark up Documents & screenshots
INSTANT MARKUP is a set of tools for annotating documents in any app, whether for your own use or to collaborate with other people. In most apps you only have to tap the Share icon, then Create PDF in the bottom row of the sheet. Some add extra steps: at the documents list in Pages, tap the Share icon, Send a Copy, PDF, then Create PDF. If an app has no sharing feature, you can take a screenshot and annotate that!