Microsoft Edge has a dark theme, but you need to enable it in the Edge application settings. Even if you activate Windows 10 dark theme, Edge will continue to use its light application mode until you try to select the dark mode.
How to activate the dark theme in Microsoft Edge
To activate the dark theme in the new Microsoft Edge browser based on Chromium, click on the menu button and select “Settings”.
Select the “Appearance” category on the left side of the Settings page.
Click on the “Theme” box under Personalize the browser and select “Dark”.
By default, Edge is set to the “Light” theme. You can also select the “Default System” option and Edge will follow the Windows theme option you chose in the Settings application.
How to force a dark theme on all websites
Websites Can Choose To Obey Your Browser’s Dark Theme, but almost no website will yet do so. The new Edge browser is based on Chromium, however, and contains the same experimental “Force dark mode” option found in Google Chrome.
To activate it, type “edge: // flags” in the Edge address bar and press Enter.
Look for “Dark Mode” in the search box at the top of the Experiments page. Click the “Force dark mode for web content” box and select “On”.
When you are done, click on “Restart”. Microsoft Edge will close and reopen all of your open Edge browser windows. You won’t lose your open tabs, but make sure you’ve saved any work (such as data entered into forms) on the web pages before continuing.
Browse and see how it works. You can turn this option off by returning to the Flags page, setting the “Force dark mode for web content” option to “Default” and restarting Edge again.
Activate the dark theme in classic Microsoft Edge
To activate the dark mode in the original version of Edge for Windows 10, click on the menu button, then select the “Settings” command.
Click the “Choose a theme” box at the top of the Settings pane, then select the “Dark” option.
Edge immediately switches to a dark theme, whether or not you are using the Windows 10 dark application theme. You can go back here and put Edge back into light mode at any time.
This setting is completely independent of the system-wide application theme that you can select in the Windows 10 Settings application. For example, you can use a Dark Edge browser theme while using the light application mode standard for all your other applications.
How to Darken All Web Pages in Edge
The theme option only changes the Edge interface, not the websites you visit in Edge. To make web pages darker in the classic version of Microsoft Edge, try installing an extension such as Turn off the lights, available in the Microsoft Store.
This extension is primarily intended for watching videos on the web with a dark background, but it can also apply a dark theme to each web page you visit. It works a bit like Dark Reader extension for Google Chrome and Mozilla Firefox.
After installing this extension, click menu> Extensions> Turn off lights> Options to configure it.
Switch to the “Night mode” tab, then select the option “Show the night switching button under the web page to make the page dark or light” on the right. The extension places a button on each web page that will put it in night mode.
You can also activate the option “Automatically switch to night mode when a new web page is opened” to always use the default night mode.
Configure the other options here to work the way you want. For example, you can set the Night Mode switch to appear only during the night hours and not appear during the day hours.
When viewing a web page, click the “Night Mode” button in the lower left corner of the page to enable or disable the dark website style.
If you decide not to use the dark website style in the future, you can click the menu> Extensions in Edge to configure, disable, or uninstall the Turn Off the Lights extension.