The files are only locked for other users on that same computer. If you email that ZIP to a colleague or put it on a USB drive, it will likely be unreadable or completely unprotected for the recipient. The Solution: The "Big Three" Third-Party Titans
If you do not want to install third-party software, you can use Windows' built-in Encrypted File System (EFS). This method does not password-protect the ZIP file itself; instead, it password-protects a folder containing the ZIP. This is best for personal use on a single computer. password protect zip file windows 11
PowerShell can create zip files but add a custom password to a standard zip without third-party libraries. Avoid this for simple protection. The files are only locked for other users
To create a ZIP that is truly password-protected and portable across different devices, you need a dedicated archiving tool. 1. 7-Zip: The Gold Standard (Free & Open Source) This method does not password-protect the ZIP file
Grab the official installer from the 7-Zip website.
While Windows 11 excels at many things, it has a surprising limitation: its built-in compression tool to a ZIP file . While you can "Compress to ZIP file" with a single click, that file remains open to anyone who finds it.
If you select files, choose "Compress to ZIP," and then try to add a password afterward, Windows will create the ZIP first, and if you attempt to add a password later using a tool like 7-Zip, it often creates a second ZIP inside the first one. The outer layer is unencrypted.