Free Online PDF Tool
Protect a PDF with a Password
Add password encryption to a PDF so only people with the password can open it.
Open Protect PDF →No signup required · Free up to 20MB per file
How to Use Protect PDF
- Upload the PDF you want to protect.
- Set a password.
- Click Protect and download the encrypted PDF.
Frequently Asked Questions
What encryption does this use?
Files are encrypted with AES-256 where the server environment supports it, with a lighter fallback used only if that's unavailable — either way the file is genuinely password-protected.
Is my file uploaded to a server?
Yes — this tool needs server-side processing for accurate results. Your file is transferred securely, processed, and automatically deleted within 30 minutes.