Protect PDF
Add an open password to restrict access to the PDF
Browser encryption limitation
Most modern PDF viewers will honour the password set here. However, browser-based PDF encryption is not as strong as encryption applied by Adobe Acrobat or LibreOffice. For highly sensitive documents requiring robust password protection, use dedicated desktop software.
Drop a PDF here
or click to browse
How to password-protect a PDF
Upload your PDF
Drop your PDF into the box above or click to browse. No account required.
Set a password
Enter the password you want to require for opening the file. Optionally set an owner password to restrict editing and printing.
Download protected PDF
The encrypted file is saved directly to your device. Share it knowing only someone with the password can open it.
Frequently asked questions
What encryption is used?
AES-256 encryption — the same standard used by most professional PDF applications and broadly recognised as secure.
Can I remove the password later?
Yes. Use Unlock PDF with the same password to remove protection from a PDF you own.
What's the difference between user and owner passwords?
A user password is required to open the file at all. An owner password restricts editing, printing, and copying without affecting opening. You can set both for maximum control.
Are my files private?
Yes. Encryption is applied entirely in your browser using pdf-lib. Your PDF never leaves your device.
What if I forget the password?
There is no recovery method — AES-256 encryption is designed to be irreversible without the password. Store it securely before distributing the file.