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Protect PDF with Password Online Free — Encrypt PDF (AES-256) Safely

Lock confidential PDF files with an open password and strong AES-256 encryption 100% inside your browser. Restrict printing, copying, or editing with zero uploads.

PixelCut Studio

Add a strong AES-256 password to any PDF online free. Lock PDF opening, printing, and text copying right in your browser with complete privacy and zero watermarks.

Step-by-Step Guide & Specifications

  1. Select one or multiple PDF files you want to encrypt with a password.
  2. Set your Document Open Password, pick AES-256, and choose print/copy restrictions.
  3. Click Protect PDF to encrypt locally in your browser and download immediately.

Frequently Asked Questions

How strong is the PDF encryption applied by Protect PDF?

It uses industry-standard 256-bit PDF encryption locally in your browser, with 128-bit and legacy 40-bit options also included.

Can I block printing or copying text without setting an open password?

Yes! Expand the Permissions options to add an Owner Password and restrict printing, copying, or editing even if you leave the Open Password blank.

Are my confidential PDF files uploaded to any external server?

No! All encryption executes 100% offline inside your browser with zero server uploads or limits.