Protect PDF
Protect PDF with password online for free. Encrypt your PDF documents securely.
Need to keep a document away from prying eyes? With PDF.dk you password-protect your PDF for free — strong encryption plus options to restrict printing and copying. Files are processed on Nordic servers and deleted automatically.
Frequently Asked Questions
- What encryption is used?
- We use AES 256-bit encryption, the strongest standard for PDF security.
- Can I restrict print and copying?
- Yes, you can set permissions for print, copying and editing separately.
- How do I put a password on a PDF?
- Upload the PDF, choose a strong password and download the protected file. The document then requires the password to open.
- What if I forget the password?
- The encryption cannot be broken — store the password somewhere safe, e.g. a password manager, and consider keeping an unprotected copy somewhere secure.
- Can I remove the protection again later?
- Yes, use the Unlock PDF tool with your password and a copy without protection is saved.
- Is it free to protect a PDF?
- Yes, PDF.dk password-protects PDF files online for free, no signup.
- Is it safe to upload my PDF?
- Yes. Your file travels over an encrypted connection, is processed on Nordic servers and is deleted automatically shortly after. We keep no copies and share nothing.
How to
- Upload your PDF file
- Enter a strong password
- Select permissions (print, copy, edit)
- Click "Protect" and download your encrypted PDF