If you're running Google Chrome 57 or above, it turns out there's a hidden dark mode. Reddit user _paul- found the menu, which you can enable with a quick jump into the console menu.
The dark is, as you'd expect, dark, with a black background and white text. Here's how to turn it on:
- Head to YouTube.
- Open up the developer menu by pressing Ctrl+Shift+I on Windows (Option +Shift+I on Mac).
- Click on Console.
Paste in this line of text:
document.cookie="VISITOR_INFO1_LIVE=fPQ4jCL6EiE"then tap Enter.
- Close the developer window and refresh the page.
- Click on the three line Settings icon on YouTube. Then click on Dark Mode.
That's it, you now have an experimental dark mode available to you.