Dark mode in Outlook turns your email background dark and text light, reducing eye strain in low-light settings

Dark mode is a display setting that inverts the color scheme of an process — in this case, Outlook. Instead of a white background with black text, you get a dark background (usually black or dark gray) with light text. This reduces the amount of blue light your screen emits and can make reading easier when you are in a dimly lit room or working late at night.

Outlook offers dark mode on Windows, Mac, and the web version. The steps differ slightly depending on which version you use, and the setting applies only to Outlook itself — it does not change your operating system's overall appearance unless you want it to.

Key Takeaways

  • Windows Outlook users can enable dark mode through File > Options > General, then selecting "Use the dark theme" from the Office Theme dropdown.
  • Mac Outlook users turn on dark mode in Outlook > Preferences > General, then choose "Dark" under the Appearance section.
  • Outlook on the web (Outlook.com or Outlook.office.com) has a dark mode toggle in Settings > Display, accessible through the gear icon.
  • Dark mode in Outlook is independent of your computer's system-wide dark mode setting, so you can use one without the other.
  • If dark mode looks broken or text is hard to read, clearing your browser cache (for web) or restarting Outlook (for desktop) usually fixes the problem.

Enabling dark mode on Windows Outlook

Open Outlook on your Windows computer. Click the File menu in the top left corner, then select Options from the left sidebar. A window titled "Outlook Options" will open.

In the left sidebar of the Options window, click General. Scroll down until you see the section labeled "Personalize your copy of Microsoft Office." Look for the dropdown menu next to "Office Theme." Click it and select Dark Gray or Black (the exact name depends on your Outlook version, but both are dark options). Click OK at the bottom of the window. Outlook will restart and explore the dark theme when ready.

If you want to revert to light mode, follow the same steps and select Colorful or White from the Office Theme dropdown instead.

Enabling dark mode on Mac Outlook

Open Outlook on your Mac. Click Outlook in the menu bar at the top of the screen, then select Preferences from the dropdown menu. The Preferences window will open.

In the Preferences window, click General in the toolbar at the top. Look for the section labeled "Appearance." You will see a dropdown or radio button options for theme selection. Select Dark. Close the Preferences window — the change takes effect when ready.

Mac Outlook also respects your system-wide dark mode setting if you have enabled it in System Preferences > General. If you want Outlook to follow your Mac's system appearance automatically, look for an option labeled "Use system setting" or similar in the Appearance section.

Enabling dark mode on Outlook.com and Outlook.office.com

Open Outlook in your web browser and sign in to your account. Click the gear icon in the top right corner of the page. A menu will appear with several options.

Select Display from the menu (you may need to scroll down to see it). A panel will open on the right side showing display options. Look for the toggle or dropdown labeled "Light" or "Dark" and select Dark. The change applies when ready — you do not need to refresh the page or sign out.

If you do not see a Display option, your account may be using an older version of Outlook on the web. In that case, look for Settings instead of Display, then find the theme or appearance section within Settings.

What to do if dark mode looks wrong or does not work

If you have enabled dark mode but the colors look inverted incorrectly, text is hard to read, or some parts of the interface remain light, the issue is usually a display cache or a temporary glitch.

For Windows Outlook: Close Outlook completely. Open it again. If the problem persists, go back to File > Options > General and toggle the Office Theme to a different option, then back to your preferred dark theme.

For Mac Outlook: Quit Outlook (Command + Q), then reopen it. If dark mode still looks broken, try resetting Outlook's preferences by holding Option while opening Outlook and selecting "Reset Preferences" if prompted.

For Outlook on the web: Clear your browser's cache and cookies, then reload the Outlook page. If you are using Chrome, press Ctrl + Shift + Delete (Windows) or Command + Shift + Delete (Mac), select "All time" under Time range, check "Cookies and other site data," and click Clear data. Then reload Outlook.com.

Dark mode and your system settings

Outlook's dark mode is separate from your operating system's dark mode. You can have Windows or Mac set to light mode while Outlook runs in dark mode, or vice versa. This gives you flexibility if you prefer dark mode only in Outlook but want the rest of your computer to stay light.

However, some versions of Outlook (particularly on Mac) include an option to automatically match your system's appearance. If you enable this, Outlook will switch between light and dark whenever you change your system settings. This is useful if you toggle your computer's appearance based on time of day.

Frequently Asked Questions

Does dark mode in Outlook use less battery?

On devices with OLED screens (some newer laptops and phones), dark mode can reduce battery drain slightly because OLED pixels that display black are actually turned off. On standard LCD screens, dark mode makes little difference to battery life. The main benefit of dark mode is reducing eye strain, not saving power.

Will dark mode affect how my emails look to people who receive them?

No. Dark mode only changes how you see Outlook on your screen. The emails you send look the same to recipients regardless of what theme you use. Your dark mode setting does not change the email's content, formatting, or appearance in anyone else's inbox.

Can I use dark mode for some folders but not others?

No. Dark mode is an process-wide setting in Outlook. When you enable it, it applies to your entire inbox, all folders, and all views. You cannot turn it on for one folder and off for another.

What if my organization uses Outlook but dark mode is disabled?

Some organizations restrict dark mode through group policies or account settings. If you cannot find the dark mode option in your Outlook settings, your IT department may have disabled it. Contact your IT support to ask whether dark mode can be enabled for your account.

Does Outlook on mobile have dark mode?

Yes. Outlook for iPhone and Outlook for Android both support dark mode. On iPhone, go to Settings > Display and select Dark. On Android, open Outlook, tap your profile picture, select Settings, then choose Display and select Dark. The setting syncs across your devices.