Password-protecting a PDF ensures only authorised recipients can open and read it. This is essential for sensitive business documents, confidential reports, legal contracts, and personal financial records.
Types of PDF Protection
- Open password: Requires a password to open and view the PDF
- Permission password: Allows viewing but restricts printing, copying, or editing
- Both: Maximum protection — requires a password to open AND restricts further actions
How to Protect PDF with Password Free
Visit imgresizr.com's PDF Tools section and upload your PDF. Enter a strong password (at least 12 characters mixing letters, numbers, and symbols). Choose whether to restrict only opening or also restrict printing and copying. Click Protect and download your password-protected PDF. Share the PDF and the password to recipients separately — never in the same message.
Password Strength Guidelines
| Password | Security Level |
|---|---|
| Less than 8 chars | Weak — avoid |
| 8–11 chars mixed | Moderate |
| 12+ chars mixed | Strong |
| 20+ chars | Very strong |
Important Security Notes
- Never share the password in the same email or message as the PDF
- Use a different communication channel for the password (e.g., SMS, phone call)
- Keep a record of passwords for protected PDFs you create
- PDF encryption is strong but not unbreakable — do not rely on it for classified government material
- Some tools and services can remove PDF passwords — protection works best as a deterrent
Protect PDF files with passwords for free at imgresizr.com — add security to any PDF document instantly.