How To: Change Default Font, Color, Style, and Size in Microsoft Outlook

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If you don’t like the default look of Outlook, you may want to know how to change fonts, sizes and colors in Outlook to your liking.

Most of them can be modified, but the way this happens is scattered between different Windows and Outlook settings, and even then they are not in the same place. Some sections may even be modified in different ways to achieve the same or similar results.

This guide provides an overview of how you can change the section in Outlook and whether it should be done at the Outlook or Windows level.

The default font in Microsoft Outlook for writing and reading messages is Calibri or Arial. If this is not your preference, you can change the default font for messages in Outlook as you wish. Smaller, larger, more fanciful or conventional fonts – you are only limited by the fonts installed on your system.

Changing the default font, color, style and size of messages

  1. On the File tab, select Options > Messaging.
  2. Under Write Messages, select Letter Header and Fonts.
  3. On the Personal Stationery tab, under New Messages or Reply or Forward Messages, select Font.
  4. In the Font area, select the font, style, size and color you want to use. You can preview your changes as you make them.
  5. Select OK three times to return to Outlook.

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To change the default font in Outlook on the Web:

  1. Select Options from the speed menu.
  2. On the Template menu, click Message Format.
  3. Make the desired changes in the Message Font window.
  4. Click on Save.

If You Are Using Themes

  1. Click on Subject.
  2. Select your favorite theme from the Select a theme list.
  3. If you do not want to use a theme, make sure that (No theme) is selected.
  4. Now click on OK.


Outlook is infinitely adjustable. In addition to removing ribbon elements, hiding additional mailboxes or selecting items that go where, you can also set the default font and customize the size. Whether it is enlarged to relieve these chronic eye pains or reduced to integrate more things into a single window, it’s quite simple.

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