How to Password Protect a PDF (and Remove a Password You Know)

When PDF password protection actually helps, what it does and doesn't prevent, and how to add or remove one in your browser.

Password-protecting a PDF encrypts the file so it can't be opened without the password. It's the right move for anything you'd rather not have readable if the file is forwarded, leaked from an inbox, or left on a shared computer — contracts, payslips, medical records, financial statements.

What PDF protection actually does

A password-protected PDF is encrypted, not just "locked". Without the password, the content is unreadable — a viewer can't open it, and the text can't be extracted. That's different from a watermark (visual deterrent only) or restriction flags like "no printing" (which merely ask viewer software to behave). If you need real confidentiality, encryption with a strong password is the only one of those that enforces anything.

How to protect a PDF

Open the Protect PDF tool.
Upload the file and choose a password — a long one; a short password on a strongly encrypted file is still easy to guess. The Password Generator helps here.
Download the encrypted copy and share it. Send the password through a different channel than the file — if both travel in the same email, the protection is theater.

Removing a password you know

The reverse job comes up just as often: a bank statement or payslip arrives password-protected, and you need a clean copy for your own records or an application form that won't accept protected files. The Unlock PDF tool removes the protection — you enter the correct password once, and it saves an unencrypted copy. It's for files you're authorized to open, not for cracking passwords you don't know.

One warning

There is no "forgot password" for an encrypted PDF. If you protect a file and lose the password, the content is gone for practical purposes. Keep an unprotected original somewhere safe, and treat the protected copy as the one that travels.