Encrypting a PDF transforms its content into unreadable data that can only be decrypted with the correct password. The AES-256 standard is used – the same algorithm as in banking systems. Without the password, reading the document is computationally infeasible.
Remember or store your password securely – the service does not retain passwords and cannot recover them. If the password is lost, the file cannot be read.
Practical tip: when sharing a protected file, send the password via a separate channel – a phone call or a different messenger. This protects against interception if the email with the PDF is misdirected.