PDF security

Protect a PDF with a password

CrabPDF can export a password-protected copy of your current PDF locally in the browser. The protected file is downloaded separately, so your editable document stays open.

Open CrabPDFAll features

How it works

Open a PDF and make any edits or annotations you need.

Open the Security panel in the right sidebar.

Enter and confirm a password.

Download a protected PDF copy.

Related tools

Merge PDFs · Sign PDFs · Redact PDFs · No-upload editor

Privacy-first

Password protection runs locally in your browser. No upload is required, and after CrabPDF is loaded you can turn off Wi-Fi and keep working.