In an era where data breaches and unauthorized access are constant threats, encrypting sensitive files before sharing or storing them is a prudent practice. 7-Zip , a free, open-source file archiver, offers a robust built-in feature for password-protecting and encrypting archives. Here’s everything you need to know about using it effectively. What Does 7-Zip Password Protection Actually Do? When you set a password on a 7-Zip archive, you are not just "locking" the folder. 7-Zip uses strong AES-256 encryption (Advanced Encryption Standard with a 256-bit key) to scramble the contents of your files. Without the correct password, the data is virtually impossible to decipher, even with brute-force attacks.