Encrypt a PDF with an open password and optional permission restrictions.
The Password Protect PDF tool adds AES-style encryption to any PDF using an open password that recipients must type to view the document.
Mix upper- and lower-case letters, numbers, and a symbol. Avoid dictionary words and personal information. Once the file is encrypted there is no recovery — store the password somewhere safe.
Encryption happens in your browser. Neither the file nor the password is transmitted anywhere.