Password Protect PDF
Add password encryption to PDF files. Secure PDFs with user and owner passwords.
Click or Drag PDF Here
Maximum file size: 10MB
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What is This Tool?
Add password protection to PDF files online for free. This tool encrypts PDFs with user passwords (open password) and owner passwords (permission restrictions). Perfect for securing confidential documents, contracts, or sensitive information.
Unprotected PDFs can be viewed, copied, and modified by anyone. Password protection prevents unauthorized access and restricts actions like printing, copying, or editing. Our tool offers 128-bit and 256-bit AES encryption.
How to Use
Upload PDF - Drag and drop your PDF or click to browse. Files up to 50MB supported. Processing in browser.
Set Passwords - Enter user password (to open PDF) and/or owner password (to restrict permissions). Choose encryption level.
Protect & Download - Tool encrypts PDF with passwords, applies restrictions, downloads secured PDF.
Frequently Asked Questions
What's the difference between user and owner password?
User password prevents opening PDF. Owner password restricts printing, copying, editing while allowing viewing.
How strong is the encryption?
128-bit or 256-bit AES encryption, same as banking security.
Can I set permissions without password?
Yes! Owner password can restrict actions without requiring password to open.
Is my data secure?
Yes. All processing in browser. Passwords never sent to server.
Can protected PDF be unlocked?
Only with correct password. Choose strong passwords for security.
What's the file size limit?
Supports PDFs up to 50MB.