Google Docs defaults to a light theme in most cases, but there's an easy way to enable Dark Mode on Android, iPhone, iPad, and even Google Chrome. We'll show you how.

While we'll focus on Google Docs, you should know that the steps are exactly the same for Google Sheets and Google Slides.
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Enable Dark Mode in Google Docs in Google Chrome
Google Chrome on desktop (Windows, Mac, and Linux) allows you to enable Dark Mode in Google Docs (but keep in mind that this method forces Dark Mode on all websites). Follow the steps below.
In the address bar at the top of your Google Chrome browser, type chrome://flags.

Use the search box at the top to search for “Force Dark Mode.”.

Click the drop-down menu next to Force Dark Mode for Web Contents and select “Enabled.”.

Chrome will show you a message asking you to restart the browser to apply these changes. Click “Relaunch.”.

Open the Google Docs website and you will see that the page color is now black and the font color is now white.
See also: How to download and save images from a Google Docs document
Enable Dark Mode in Google Docs for Android or iPhone
The Google Docs app on Android and iPhone lets you quickly switch between light and dark themes. If you have dark mode enabled system-wide on Android or iPhone, Google Docs will turn it on by default. However, if you want dark mode only in Google Docs, here's what you need to do.
Open Google Docs and tap the menu icon in the top left corner.

Then, select “Settings”.

Now, select the “Theme” option, which will allow you to select dark mode. This option is called “Choose Theme” on Android.
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Select “Dark.”

All documents in Google Docs will now open in dark mode. However, you can view documents in a light theme if you want. To do this, open any document in Google Docs and tap the three-dot menu icon in the top right corner.

Switch to “View in Light Theme.”

This will change all documents in Google Docs to the light theme, while keeping the app in dark mode.
Information source: howtogeek.com
