If you want YouTube to automatically match your computer or phone’s theme — switching between light and dark depending on your system settings — then activating the Device Theme is the best option. It keeps everything consistent without you having to toggle it manually.
https://www.youtube.com/watch?v=IAfemjBoN1Y
Here’s how to set up the YouTube Device Theme quickly:
1. Open YouTube and Sign In
Head to youtube.com and make sure you’re logged into your account.
2. Click on Your Profile Icon
In the top-right corner, select your profile picture to open the main menu.
3. Go to “Appearance” Settings
Scroll down the menu until you find the Appearance option — this is where you control how YouTube looks on your device.
4. Choose “Use Device Theme”
Select Use device theme. YouTube will now automatically adjust between Light and Dark Mode based on your system preferences.
5. Confirm the Change
Your screen will instantly update to reflect your current OS theme. If you ever switch your device from light to dark, YouTube will do the same.
Bonus Tip:
This feature works on desktop and mobile, keeping your visual experience seamless across all devices. It’s especially handy for those who use macOS or Windows’ auto-night mode, as YouTube will shift colors right alongside your system.
Enabling the device theme ensures your YouTube viewing feels unified, clean, and effortless — no extra clicks needed.