PDF Password Protect & Unlock
Add an AES-256 open password and print or copy limits to a PDF, or unlock one whose password you know. Files never leave your browser.
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How to use
Everything you enter is processed only in this browser.
Choose a PDF and the tool checks whether it has a password
Choose Add password or Remove password and enter the password
Download the checked PDF
How it works and good to know
Processing runs qpdf 12.2 (Apache 2.0) as WebAssembly in a dedicated worker in this browser. Adding a password uses AES-256 (R6), and print, copy and edit restrictions are set together with a permissions password. A password is removed only when qpdf confirms the one you entered is correct; files with only a permissions password also need that password to be unlocked. Passwords are never guessed or brute-forced. Each created file is reopened before download to check its password state and structure. Files up to 100 MB.