To secure your PDF documents from unauthorized access like copying or printing, you should password-protect your file! Protect PDF files by adding a password and encrypting it. PDF Password Protector is a free and easy tool to secure pdf by adding a password. you can make protected pdf files in seconds. this app is offline not need an internet connection, leave protect pdf online service app that needs internet. Reliable PDF password protection: Encrypt your PDF with a password to prevent unauthorized access to the file content, especially for file sharing or archiving. A good length for a secure password: For a very secure password, we recommend using a non-dictionary word of 7 characters or more. Also include numeric characters, capital letters, and symbols.