How to password-protect a PDF with MobiPDF on iOS

MobiPDF lets you encrypt your PDF files and/or a:

• file level, allowing no one to view the file unless they have the password.
• action level, restricting certain actions unless they have the password. 

To set a custom password:

1. Open a PDF. 

2. Tap the dropdown menu in the upper rightmost corner, then choose Protect. 

3. Type and retype your password and tap OK.