The best window film for privacy and security is one that makes it hard to see into the space. While that might sound simple, there are a few window films that can reduce visibility in different ways: Frosted: Applying a frosted film doesn’t allow any visibility into the space, but will still transfer natural light. Dark: Darker tinted window films will look like the lights are off even in the daylight. At night, however, you will still be able to see the light inside the space if it is brighter inside than outside. Reflective: Reflective window films give the appearance of a mirror during the daylight. Reflective film has the same issue as darker tints where you will be able to see inside at night when the lights are on. When it comes to security, it could be a privacy or visibility issue. That’s when frosted, dark, or reflective window films are great options. But if you need the space to be more secure from unwanted entry, then you would want to use a security film.