Protect PDF with a Password — Free Online

Add password protection to keep your PDF secure.

Click or drag a PDF file here

PDF only · Up to 50MB

Or import from cloud

How to password-protect a PDF

Set a password and pdfs.to applies AES-256 encryption with qpdf so only people with the password can open the file.

Use a strong password and store it somewhere safe — there's no way to recover the file if you forget it. To remove a password from a PDF you already know the password to, use Unlock PDF.

Related PDF Tools

Frequently Asked Questions