How it works
The PDF Password Protector adds password encryption to any PDF document — either a user password (required to open the file) or an owner password (which restricts printing, copying, and editing), or both. The encrypted PDF is generated entirely in your browser.
Password-protecting PDFs is standard practice for sensitive documents: a payslip emailed to an employee, a contract shared via messaging, a report containing financial forecasts, or any PDF that should only be read by an authorized recipient. The password ensures the file remains private even if the email or link is intercepted.
How to use it: upload your PDF. Choose the protection type: - User password: the recipient must enter the password to open the PDF - Owner password (permissions): restrict copying text, printing, or editing without a separate opening password - Both: require a password to open AND restrict what authorized users can do
Set a strong password (12+ characters, mixed case, numbers, symbols). Click Protect and Download the encrypted PDF. Share the password with the recipient via a separate channel (message, phone call — not the same email as the PDF).
Encryption strength: the tool uses 128-bit RC4 (PDF 1.4 compatible) or 256-bit AES (PDF 1.7, requires a reader supporting PDF 1.7+). Choose 256-bit AES for documents containing highly sensitive data.
Privacy: encryption runs in the browser using pdf-lib. Your PDF and chosen password never leave your device.
Frequently Asked Questions
- The user password (also called the open password) is required to open and view the PDF — without it, the file cannot be read. The owner password (also called the permissions password) controls what authorized users can do: print, copy text, or edit. You can set either or both. A user password without an owner password allows all actions once opened.
- For 256-bit AES encryption (PDF 1.7), a 12+ character password with mixed case, numbers, and symbols is effectively uncrackable. Shorter passwords (under 8 characters) are susceptible to dictionary attacks. For highly sensitive documents, use a minimum 16-character random password and store it in a password manager.
- The password protects the content from unauthorized access, but share the password via a separate channel — not in the same email. Sending the PDF and its password in the same email provides little protection if the email is intercepted. Use a separate SMS, phone call, or messaging channel.
- Yes. Password-protected PDFs are supported by all major PDF viewers: Adobe Acrobat Reader on iOS/Android, Apple Books, Chrome PDF viewer, and Firefox. When opened, the viewer prompts for the user password before displaying the content.