This article explains how to turn on the keyboard backlight on computers that have this functionality, including Windows and macOS computers.

If your laptop or keyboard supports it, turning on the keyboard light is usually just a matter of finding the right button. In some cases, the keyboard light may be disabled in your operating system settings or in an app from your computer manufacturer. The button or buttons that normally control your keyboard light may not work in this scenario. If that's the case, you'll need to turn on the keyboard light in your operating system settings or in your computer manufacturer's app.

Windows computers assign one of the function keys to control the keyboard illumination, but it is not the same key for every computer. Each manufacturer sets the key independently of the others. Therefore, you will have to look at the function keys, experiment with the function keys, or contact the manufacturer to determine which key to press.

The exact way the keyboard backlight key works also varies from manufacturer to manufacturer. Some manufacturers only let you turn the light on or off, some offer a few brightness levels, and others have multiple brightness steps.