If you are looking for free folder lock software, start with the free methods already available on Windows. They can be enough for low-risk personal files, temporary sharing, or simple privacy. If you need stronger folder-level control for shared PCs, USB drives, office folders, or everyday protection, GiliSoft File Lock Pro gives you a more complete workflow.
Right-click a folder, open Properties, and mark it as hidden. This is free and quick, but it is easy to reveal if someone enables hidden items in File Explorer.
A compressed archive can work for files you rarely edit. It becomes inconvenient when you need to open, update, and re-protect the same folder every day.
NTFS permissions can restrict access between Windows users. This is useful on well-managed PCs, but it can feel complex for home users, shared workstations, and small teams without IT support.
BitLocker is strong when the goal is protecting an entire drive, especially if a device is lost. It is not the same as locking one selected folder while the rest of the drive stays normal.
Encrypting File System can encrypt files for a Windows account on supported editions. It can be helpful, but certificate management, account recovery, and portability need care.