How to enable YouTube dark mode on a desktop or mobile device

Dark mode reduces the amount of bright white light on your screen.
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You can turn on the dark theme - YouTube's version of dark mode - on desktop or mobile.
On mobile, you'll go through the app settings to access the dark theme.
The process varies slightly depending on if you have an Android or an iPhone.
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When you spend a lot of time looking at screens, the blare of a white background can be an annoyance. So turning