🔒 Runs on your device
Password-protect PDF
Lock a PDF with AES-256 encryption so only people with the password can open it.
Open Paper to password-protect PDF →Your file never leaves your device: Paper does this in your browser, and its security policy stops the page from sending data to any other site.
How to password-protect PDF
- Open the PDF.
- Click Export and type a password twice.
- Save: the file now needs the password to open.
Questions
Is it free?
Yes, free and open source, with no sign-up and no watermark.
What if I forget the password?
It cannot be recovered. Keep it somewhere safe.