Hi! How do I encrypt a pdf on here from my iPhone 11?
Not possible with Acrobat Reader.
This question has nothing to do with the Acrobat Reader mobile app.
You should consult with Apple support.
Now, if you're actually asking about how to protect a PDF with a password using the Acrobat Reader mobile app ( so that no one can open it), that is a new feature that was introduced in the last update.
When it comes to using the term "encrypt' interchangeably with "password protected", it creates confusion; since when you apply password protection to a document file it doesn't necessarily mean that it is also applying encryption to a document.
If you're using the Acrobat Reader mobile app in an iOS device, open a PDF file and see if you get the following options (see slides below; at least in Android this is a new feature that was introduced in the last Acrobat Reader mobile app update):
When you set a PDF password, the rules of PDF say it must be encrypted. So it's not a bad synonym.
Thanks for clarifying that.
Without a subscription you can't set a password.