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Lock a PDFTwo kinds of PDF passwords
PDFs can use an open password and a permissions password. An open password is required to view the file. A permissions password controls actions such as printing, copying, or editing.
For most private documents, the open password is the important one. Without it, the recipient cannot open the PDF.
What password protection is good for
Password protection is useful when sending documents by email, sharing files with a limited group, or storing PDFs in places where other people might have access.
It is not a replacement for secure delivery, careful access control, or strong account security. The password itself must be shared safely.
Choose better passwords
Use a password that is long, unique, and not based on obvious details. Avoid sending the PDF and password in the same message if the document is sensitive.
Before sharing, open the protected PDF in a separate PDF reader to confirm that the password works as expected.