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Chrome OS dark mode: Here's how to enable it
Chrome OS lacked a very important feature to begin with, which was dark mode. However, Google eventually added the feature, starting with the beta channel, then the stable channel, until finally it became a standard feature for everyone in the Chrome OS settings. Here’s how to enable dark mode on Chrome OS. It’s very easy and your eyes will thank you for it.
QUICK ANSWER
To enable dark mode on Chrome OS, go to your Chromebook's settings, then Device > Personalization. Under the Wallpaper section, you will see the Theme section where you can choose between Light, Dark, and Auto. Select Dark and everything will go black. Selecting Auto will only make the computer dark when it is dark outside at your geographical location. This will require revealing your location to Google.
How to turn on the Chrome OS dark mode
Open your Chromebook settings and navigate to Device > Personalization. This will bring you to the section for the wallpaper, the screensaver, and the theme. We will be focusing solely on the Theme.

There are three options available, all self-explanatory — Light, Dark, and Auto. If you want the computer to be permanently in dark mode, then select Dark. However, if you want it to be in light mode during the day and dark mode in the evenings and night, then select Auto.
Bear in mind that Auto will require that you tell the Chrome OS your geographical location so it knows what time of the day it is where you are. Privacy-minded users may not like that idea.
FAQs
The Chrome OS dark mode displays dark greys in most cases instead of pitch black, so even if you have an OLED screen on your Chromebook, the battery life change will be minimal at best.
Go back to Settings > Device > Personalization and select Light.