Password Protect a PDF
Add AES-256 encryption and a password to a PDF.
Drop files here, or click to browse
AES-256 encryption — the PDF will require this password to open.
Max 50 MB per file
Protect PDF adds a password to your PDF file so only people who know the password can open or edit it. ConvertDa's free Protect PDF tool uses 128-bit AES encryption — strong enough for most business and personal use cases. Set the password and download the secured file in seconds.
How to protect pdf
- 1
Upload your PDF.
- 2
Set a strong password.
- 3
Download the encrypted PDF.
Frequently asked questions
What encryption is used?▾
AES-256, the strongest standard supported by the PDF specification.
How strong is the encryption?▾
128-bit AES is the standard used by most enterprise PDF tools. It is computationally infeasible to brute-force without the password, provided the password itself is strong (12+ characters mixing letters, numbers, and symbols).
Can I set different passwords for opening and editing?▾
Yes. The 'open' password restricts who can view the file. The 'permissions' password restricts editing, printing, and copying. Set either or both.
What happens if I lose the password?▾
We do not store passwords and cannot recover them. Save your password in a password manager before sharing the protected file.