What the protection does
The file is encrypted with AES-256. Anyone who does not know the opening or owner password cannot normally open it. Permission choices add compatible-reader restrictions.
Private browser tool
Password Protect PDF
Encrypt a PDF with a password and choose whether readers may print, copy, edit, rearrange pages, fill forms, or add comments. Everything runs privately in your browser.
Strong protection, clear choices
Your PDF and passwords stay on your device. Nothing is uploaded by this tool.
- Require a password before the PDF can be opened.
- Use a separate owner password for permission settings.
- Download an AES-256 encrypted PDF in seconds.
Choose a PDF to protect
Drop one PDF here, or choose a file up to 50 MB.
Opening password
Optional. Turn it on only when readers must enter a password before the PDF opens.
No opening password
Reader permissions
Choose what compatible PDF readers should allow after the document opens.
Advanced: owner passwordControls permissions and can unlock full access.
Keep this password private. It can change the permission settings and open the PDF with full access. A strong password is generated automatically.
Your protected PDF is ready
Protection completed successfully
Save the owner password now
You may need it later to change permissions. This site does not store it and cannot recover it.
Limits and compatibility
One PDF up to 50 MB. Already encrypted PDFs and digitally signed PDFs are not changed. Protecting a signed file would invalidate its signature.
How to password protect a PDF
- Choose one PDF from your device and enter an optional opening password.
- Choose printing and editing permissions, then safely store the separate owner password.
- Select “Protect PDF” and download the encrypted copy.
PDF protection FAQ
Is my PDF uploaded to a server?
No. The PDF, passwords, encryption, and download stay inside your browser on your device.
Can I use an Arabic password?
Yes. Arabic and other Unicode passwords are supported. Use at least 8 characters for an opening password.
Can every PDF app enforce printing and copying restrictions?
No. These permissions are respected by many standard PDF readers, but some software may ignore them. The opening password is stronger because it is enforced by encryption.
Can you recover a forgotten password?
No. Passwords never leave your device and are not stored. Save both passwords securely before leaving the page.