Protect PDF
Add real password encryption (AES-256) to a PDF so it can't be opened without the password. Runs entirely in your browser — files are never uploaded to a server.
Click to upload or drag and drop
Select a PDF file
How it works
Your PDF is encrypted with AES-256 — the same modern, strong encryption standard used by professional PDF software — directly in your browser. The password itself is never sent anywhere; only you (and whoever you share the password with) can open the file afterward.
Frequently asked questions
What encryption does this use?
AES-256, the same strong, modern encryption standard used by professional PDF software — not a weaker legacy method.
Can I recover the password if I forget it?
No — the password is never stored anywhere, by this tool or anyone else, so there's no way to recover a forgotten password. Keep it somewhere safe.
What if the PDF is already password-protected?
This tool can't add a new password on top of an existing one — unlock the PDF first, then protect it with the new password.