Password Protect PDF – Lock Files with Strong Encryption

Sending unencrypted payslips, tax returns, medical reports, or legal agreements over email or messaging apps like WhatsApp exposes sensitive data to anyone who gains access to the inbox or shared device. Adding an opening password ensures that even if a file is forwarded to the wrong person or left in a downloads folder, no one can view its pages without typing the exact passphrase you set.

Our Password Protect PDF tool applies standard 128-bit PDF encryption directly to your document and lets you decide what authorized readers can do once they open it. Alongside the main opening password, you can toggle checkboxes to allow or restrict printing and text/image copying. Encrypted files work seamlessly across Adobe Acrobat Reader, mobile PDF viewers on Android and iPhone, and built-in desktop browser readers.

Unlike cloud-based PDF lockers that require you to transmit confidential files to a remote server before encrypting them, our tool performs all cryptographic operations locally inside your browser. Neither your PDF nor your password ever leaves your device. For strong protection, combine uppercase and lowercase letters, numbers, and symbols in a password of at least eight characters, and share the password with your recipient through a separate channel such as SMS or a phone call.