A free program for Windows, by Dolphin Systems.
File Hider is the most-trusted and best app to hide photos, videos, documents, and other files. With this, you can not only hide your pictures and videos but also make it impossible for anyone to view, edit, or delete them without your knowledge.
This app also has a private note section that you can use to write down your thoughts, wishes, or even secrets. In this section, you can make it impossible for anyone to read or view the contents.
Apart from that, you can also use a web browser in this app. You can access the internet through this browser, which makes it a very convenient and secure browser.