Add a password to a PDF
Choose a password and download an encrypted copy of your PDF. Anyone who opens it will need that password.
How to use Protect PDF
- Choose or drop one PDF.
- Type a password twice (4 to 64 characters, no spaces).
- Press Protect PDF and download protected.pdf.
Supported files and limits
- One PDF at a time, up to 50 MB and 300 pages.
- Passwords cannot contain spaces.
- We cannot recover a lost password.
Your files and privacy
This tool sends your file to our server, which processes it to make the result. The server is built to remove the temporary copy when processing ends. The privacy page has the details. Read the privacy notice.
Frequently asked questions
Can you recover my password if I forget it?
No. The password is not stored, so a lost password means the file cannot be opened.
What encryption is used?
AES-256, applied by the qpdf program on our server.
Is my file uploaded?
Yes, this tool needs our server. See the privacy page for how files and passwords are handled.