Add Password to PDF
Password-protect a PDF for free. Encrypt your file with AES-256 so only people who know the password can open it. Runs entirely in your browser — nothing uploaded.
Anyone can open a PDF unless you lock it. Add Password to PDF encrypts your file with AES-256 so it can only be opened by someone who knows the password — useful for contracts, statements, and anything you send by email. Encryption happens locally, so neither your file nor your password is ever sent anywhere.
How to use Add Password to PDF?
Upload the PDF you want to protect.
Enter a password and confirm it. Optionally set a separate owner password to control permissions.
Click "Add Password" — the file is encrypted with AES-256 directly in your browser.
Download the protected PDF. Anyone opening it will now need the password.
Why use Add Password to PDF?
- Real AES-256 encryption. The same standard PDF security handler used by Adobe Acrobat, so the protected file opens correctly everywhere.
- Owner and user passwords. Set a separate owner password to control permissions like printing, apart from the password needed just to open the file.
- Private and local. Your file and password are encrypted entirely in your browser and never uploaded to a server.
Professional Features
AES-256 encryption
Your PDF is protected with the same strong encryption standard used by banks and security software, applied via the standard PDF security handler.
100% Secure & Private
Encryption happens entirely within your browser. Your file and password are never uploaded to a server.
No password recovery
Because nothing is stored, we cannot recover a lost password — make sure to save it somewhere safe.
Common Questions
What encryption does this use?
AES-256, the standard PDF security handler used by Adobe Acrobat and most PDF software, so the protected file opens correctly everywhere.
Can you recover my password if I forget it?
No. Nothing is uploaded or stored, so there is no way for us — or anyone else — to recover a lost password. Keep it somewhere safe.
What is the owner password for?
The owner password controls permissions like printing and editing, separate from the password needed just to open and view the file. If you leave it blank, it defaults to the same password.