Protect PDF
Encrypt a PDF with a password (AES-256).
How to use Protect PDF
Encrypt a PDF with a password using AES-256.
- Select a PDF.
- Enter and repeat a strong password.
- Optionally restrict printing, copying or editing.
- Press Protect PDF.
Options explained
- Password
- Needed to open the file. Use at least 8 characters with letters and numbers.
- Restrictions
- Asks compliant PDF viewers to block printing, copying or editing.
Tips for best results
- Store the password safely — encrypted files cannot be opened without it, and we cannot recover it.
Questions
How secure is it?
AES-256 is the strongest encryption supported by the PDF standard. Security mainly depends on the password strength.
Is Osd-Scan really free?
Yes. Every web tool is free with no sign-up, no watermark and no daily limit. The website is supported by ads. A paid desktop app for Windows (one-time purchase, no ads) is coming soon.
Are my files uploaded to a server?
No. All processing happens inside your browser on your own device. Your documents never leave your computer or phone, so nobody — including us — can see them. You can even disconnect from the internet after the page loads.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox, Safari and Samsung Internet on Windows, macOS, Linux, Android and iPhone/iPad. For the camera scanner on a phone the page must be opened over https.