Apple has a hidden feature that lets you lock sensitive PDF documents with a password. This way, you can protect sensitive documents right on your phone and prevent others from accessing their contents. In this post, we will help you set a lock on a PDF file on your iPhone using the Files app.
How to Lock PDF File on iPhone
You can lock a PDF file stored locally on your iPhone by following the steps below.
You can open locked PDF files just like any other file in the Files app.
No. You cannot unlock PDF files on your iPhone that are already locked. This means that PDF files that you lock using the Files app on your iPhone will remain locked forever and you will not be able to unlock them using the Files app. Locked PDF files can only be accessed after you enter the password that you set for them, and you will need to enter that every time you open the file.
