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Password-protect a PDF

Encrypt the PDF with AES-256 so it only opens with your password, and optionally restrict printing, copying and editing. The result is verified before you download.

How to use Protect PDF

  1. Open the PDF.
  2. Enter a password (and an optional separate permissions password).
  3. Choose permissions.
  4. Protect & download.

When to use it

  • Emailing payslips, statements or medical letters.
  • Archiving confidential files.
  • Sending drafts you don't want edited.

What to expect

  • Permissions (no printing, no copying) are policy flags that some PDF readers ignore — only the open password truly protects the content.
  • If you forget the password, the file can't be recovered.

Questions

Which encryption is used?

AES-256 (PDF 2.0 / Acrobat X+ compatible).