Outlook Dark Mode: How to Turn It On on Any Device

To turn on dark mode in Outlook, open the app’s appearance or theme settings and choose Dark; the exact route depends on whether you use Outlook for Windows, Mac, the web, or a phone. On many versions, you can also switch the background of an individual email while reading it, which is useful when the interface is dark but a message is still bright.

What Outlook dark mode changes

Dark mode changes the colors of Outlook’s interface, usually replacing light backgrounds with dark gray or black and changing text and icons to lighter colors. Depending on the Outlook version and your settings, this can affect the mailbox, navigation, message list, calendar, and settings screens. It is primarily a display preference: it does not reorganize your mail, change your account, or automatically rewrite messages you send.

There are two related settings that can be easy to confuse. An app theme controls Outlook’s interface, while a message-background control changes how a particular email is displayed in the reading view. For example, you might set the app to dark mode but still see a white background inside a newsletter. That does not necessarily mean dark mode is broken; the message may have its own colors or formatting.

Outlook also has several generations of desktop and web apps. The classic Windows program, the newer Outlook for Windows, Outlook on the web, and Outlook for Mac do not always put the same control in the same place. If a path below does not match your screen, check which version you are using and look for Settings, Appearance, Theme, or Office Theme.

Turn on dark mode in Outlook for Windows

For the newer Outlook for Windows, open Settings using the gear icon near the top-right corner. Select General, then Appearance, and choose the dark option. Depending on the app version, the choice may appear as a Dark theme, a theme preview, or a dark-mode switch. Close Settings when you are done; your inbox should update without changing the Windows display theme.

In classic Outlook for Windows, the setting is part of the Office theme. Try either of these routes, depending on your version:

Select File > Office Account, then choose Black under Office Theme.
If that route is not shown, select File > Options > General and find Office Theme. Choose Black or another dark theme available in your installation.

The Office theme can affect other Microsoft 365 desktop apps, not just Outlook. If you want Outlook’s interface dark but prefer Word or Excel to remain light, check whether your Outlook version offers its own appearance setting. Classic Outlook’s Office Theme choice is often shared across Office apps, so a separate per-app choice may not be available there.

Turn on dark mode in Outlook on the web

In Outlook on the web, open Outlook in your browser and select the Settings gear. Go to General, then Appearance, and select a dark theme or turn on the dark-mode option shown there. The precise label can vary as Microsoft updates the web interface. If you use Outlook.com for a personal account or Outlook through a work or school account, the settings layout may differ slightly, but Appearance is the setting to look for.

Changing your browser to a dark theme does not always make Outlook on the web dark. The website may use its own theme setting, so change Outlook’s appearance directly if the page remains light. Likewise, setting Outlook to dark mode generally changes Outlook itself, not every other website open in the browser.

If you use more than one browser or sign in on a shared computer, check the appearance setting in the Outlook session you are using. A theme preference may not behave identically across accounts, browser profiles, or managed work environments. On a work account, an administrator’s configuration or a different version of the service can also make some options unavailable.

Turn on dark mode in Outlook for Mac

In Outlook for Mac, open the Outlook menu in the menu bar and choose Settings (called Preferences in some older releases). Open General and look for the appearance options. Select Dark if you want Outlook to stay dark, or choose System if you want it to follow the appearance setting on your Mac. The wording and exact controls can vary with the Outlook release.

If you select System, change the Mac’s appearance in macOS settings to control when apps use light or dark mode. This is a useful choice if you already schedule macOS to switch appearance at certain times. If Outlook does not change after you alter the Mac setting, confirm that Outlook is set to follow the system rather than being fixed to Light or Dark, and check for an available app update.

Turn on dark mode in the Outlook mobile app

On iPhone, iPad, and Android, open Outlook and tap your profile icon or account image, then tap the gear for Settings. Look for Appearance or a theme option and choose Dark, if available. Some releases offer a System choice that follows your device’s light or dark appearance. Menu names can shift between app versions, so use Settings search if your version provides it.

Choosing System is convenient if your phone already switches themes automatically. Choosing Dark keeps Outlook dark even when the phone is set to light mode. This setting is separate from the phone’s general appearance on some versions of the app, so changing the device theme may not be enough; check Outlook’s own setting if the app stays bright.

If you cannot find an appearance choice, update Outlook through your device’s app store and reopen it. Availability and labels can vary by operating system, account, and app release. Also note that the Outlook mobile app’s dark theme may render individual emails differently from the surrounding inbox, especially when a message contains its own background colors or images.

Make an individual email easier to read

A dark Outlook interface does not guarantee that every message will have a dark background. Email is created by many different senders and services, and messages may include explicit background colors, images, or other formatting. Outlook may preserve some of that design even when the mailbox itself is dark.

In desktop Outlook, open the message and look for a control to switch the message background, often represented by a sun or moon icon or a label such as Switch Background. The location depends on the Outlook version and reading view. Selecting it can change the displayed background for that message without changing the theme of the rest of Outlook. If you do not see the control, check the message toolbar or the View-related options available in your version.

This is a viewing adjustment, not an edit to the sender’s original email. It does not change how the email appears to other recipients, and it may not override every image, color, or layout in a complicated newsletter. If a message remains hard to read, try opening it in a separate window, increasing text size with your app or device controls, or viewing it in the sender’s accessible web version when one is provided.

Choose between Dark, Light, and System

Dark mode is a preference, not a requirement. Dark can be comfortable in a dim room or if you prefer less bright interface space. Light mode may be easier for you to read in a bright environment or when you work with documents and emails designed around white backgrounds. System is a practical middle ground when you want Outlook to follow your computer or phone’s scheduled appearance changes.

Choose Dark when you want Outlook to remain dark regardless of the device’s current theme.
Choose Light when you prefer a bright interface or dark colors make text and icons less clear to you.
Choose System when Outlook should follow the light or dark setting configured on your device.

Dark mode does not automatically reduce eye strain for everyone, and it is not a medical treatment. Comfort depends on the display, room lighting, text size, contrast, and personal preference. On some OLED screens, showing mostly black pixels can use less power than showing bright pixels, but the effect depends on the device and what is on screen; a dark theme is not a guaranteed battery-saving feature on every phone or monitor.

Fix common dark-mode problems

If Outlook remains light after you select Dark, first make sure you changed the setting in the Outlook app you are actually using. Classic Outlook for Windows and the newer Outlook for Windows have different controls, and a browser’s theme setting is not always the same as Outlook’s own setting. Reopen Appearance or Office Theme and confirm that the change was saved.

Only the email is white: The message may use its own formatting. Look for a message-background or Switch Background control; the inbox theme and message display are separate.
The setting is missing: Check whether you are in classic Outlook, new Outlook, Outlook on the web, or the mobile app. Update the app if appropriate, and remember that work or school administrators can restrict some settings.
Outlook follows the wrong schedule: If the theme is set to System, check the device’s own appearance and automatic schedule. Choose Dark directly in Outlook if you do not want it to follow the device.
Text or icons are difficult to see: Try Light mode, adjust display contrast or text size, or change the device’s accessibility settings. A dark background is not necessarily the most readable choice for every person or message.

When a change does not appear immediately, close and reopen the settings panel or restart the app. For Outlook on the web, refreshing the page can help after changing a setting. Avoid assuming that reinstalling the app is necessary; first identify the version, verify the selected theme, and check for an update or an organization-managed restriction.

Frequently Asked Questions

Does Outlook dark mode change the emails I send?
Usually, the theme changes how Outlook’s interface is displayed, not the content or formatting of messages you send. The appearance of an email can still depend on the formatting you choose and how the recipient’s email app displays it.

Why is an email still white in Outlook dark mode?
The message may include its own background color, images, or formatting that Outlook preserves. Look for a message-specific background switch in desktop Outlook, if your version offers one. That display control does not alter the original message.

Can Outlook dark mode turn on automatically at night?
In versions with a System appearance option, Outlook can follow the light or dark setting of your device. Automatic switching is controlled by the device’s appearance schedule, not necessarily by a separate Outlook timer. Select Dark directly if you want Outlook to stay dark all the time.

Is Outlook dark mode available on every device?
Dark appearance options are available in many current Outlook apps, but their location and availability vary by platform, app version, and account setup. Update the app and check its Appearance or theme settings; a managed work account may have some choices restricted.

Does dark mode save battery?
It can use less power on some OLED displays because dark pixels may consume less energy, but the result depends on the screen and the content being shown. On other display types, the difference may be small or absent, so dark mode should not be treated as a guaranteed battery-saving setting.

Sources: general know-how. Menus and buttons can differ slightly by version. Spotted something out of date? Tell us.