How to Password Protect a PDF Document

What PDF password protection actually does An \"open password\" (also called a user password) encrypts the PDF so it can't be opened without the correct password. This is different from permission restrictions (like disabling printing), which are easier to bypass and shouldn't be relied on for confidentiality. For genuinely sensitive files, an open password with a strong passphrase is the meaningful protection. ## Step-by-step 1. Open the Protect PDF tool and upload your file. 2. Enter a password and confirm it. RookPDF shows a strength indicator \u2014 aim for a passphrase of at least 12 characters mixing words, numbers and symbols rather than a short common word. 3. Click Process. The password is applied locally; the file and password never leave your browser. 4. Download the protected PDF and share the password separately from the file itself \u2014 for example, over a different messaging channel than the one used to send the document. ## Removing a password later If you receive a password-protected PDF and have legitimate access to the password, use the Unlock PDF tool with the correct password to produce an unprotected copy for your own further editing. ## A note on limits Password protection secures the file at rest and in transit, but anyone who has both the file and the password can open it freely afterward \u2014 treat the password with the same care as the document itself.