Protect PDF — Free Online PDF Tool

Add password protection to your PDF with AES-256 encryption. Free online tool, no software needed, EU servers.

How to use

  1. Upload your PDF
  2. Set an open password and/or permissions password
  3. Download your encrypted PDF

FAQ

What encryption standard is used?
AES-256 — the same standard used by banks and governments.
What is the difference between open and permissions password?
Open password locks the file from being viewed. Permissions password restricts printing, copying, and editing.
Can pdfuno staff read my protected PDF?
No — encryption happens in your browser. The server never receives the password.
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