Office Tool App

Lock PDF

Protect your PDF with an open password and customize permissions (printing, copying, editing). Download a secured file.

Drag & drop a PDF here
Viewers must enter this password to open the PDF.
Used for advanced control; leave blank if unsure.
Permissions
Checked = the action will be blocked in the output PDF.
256-bit offers stronger protection; 128-bit may be more compatible with older viewers.

How to Lock a PDF

  1. Select your PDF file.
  2. Set an Open Password (required to view the PDF).
  3. Optionally set an Owner Password and choose permission restrictions (printing, copying, editing).
  4. Pick the encryption level and click Lock PDF.

Key Notes

  • Share the open password securely with your recipients.
  • Permission restrictions rely on PDF readers respecting the policy; strong open password + AES-256 gives better protection.
  • Use this tool for files you own or have permission to protect.

FAQ

Do recipients need a password to view?

Yes—use the Open Password you set on this page.

Can I allow viewing but block printing/copying?

Yes. Tick the permission restrictions you want before locking the file.

What encryption should I use?

AES-256 is stronger. Choose AES-128 if you need maximum compatibility with very old viewers.