Protect a PDF with a password
Lock a PDF so only people who know the password can open it. This tool encrypts your file with 256-bit encryption, using qpdf on our server. Set a user password, which is needed to open the file, and, if you want one, a separate owner password as well. There is no password recovery, so keep your passwords somewhere safe. Unlike most tools on this site, this one runs on our Fast server: your file is uploaded over an encrypted connection, processed on the server, and deleted automatically - the original as soon as processing finishes, and the result right after you download it.
How to do it
- Add your PDF file.
- Type a password to open the file, and an owner password if you want one.
- Click Protect PDF and download the locked file.
Common questions
How strong is the protection?
The file is locked with 256-bit encryption using qpdf on our server, so the PDF cannot be opened without the user password.
What is the difference between the user and owner passwords?
The user password is needed to open and read the file. The owner password is a separate, optional password - set it if you want a different password for managing the file's permissions.
Are my files uploaded?
Yes, for this tool. Protection runs on our Fast server, not in your browser. Your file is uploaded over an encrypted connection, processed on the server, and deleted automatically - the original as soon as processing finishes, and the result right after you download it.
What happens if I forget the password?
We cannot recover it, and neither can the tool - there is no password recovery for a protected PDF. Keep the password somewhere safe, and keep an unprotected copy if you may need one.
Is my password sent to the server?
Yes, for this tool it has to be - protection runs on our Fast server, not in your browser, and the password is used there to lock the file. The connection is encrypted, and your file is deleted automatically - the original as soon as processing finishes, and the result right after you download it.
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