In iOS 11, Markup is a system-level feature able to annotate and draw shapes over images and PDFs. It lets you draw with a pen, a marker and some basic squares and circles over photos. Apple doesn’t really advertise Markup as a redaction feature, to cover up information, but it feels like it is up to the job and I’ve seen many people on social media use it to do just that.
However, you have to be careful as the Markup tools can be deceptive, particularly the marker. Even if it looks like the personal info is obscured, some basic photoshop work easily reveals what is underneath …
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