How To Change Outlook Font Size

Changing the font size in Microsoft Outlook can make your emails, calendar, and general interface much easier to read and use, especially if you find the default text too small or too large. This guide provides clear, step-by-step instructions for adjusting font sizes across different parts of the Outlook desktop application, ensuring you can customise your viewing experience for comfort and clarity. Whether you want larger text for incoming messages, bigger fonts for composing new emails, or a more readable folder pane, this guide will show you how.

Fast Answer

Default Mail Font: File > Options > Mail > Stationery and Fonts
Reading Pane Zoom: Zoom slider (bottom right of Outlook window)
Outlook UI Scale: Windows Display Settings > Scale

5-10 minutes Time needed

Easy Difficulty

System-wide changes Watch out for

Before You Start

You need to have the Microsoft Outlook desktop application installed and running on a Windows computer. These instructions are primarily for the desktop version of Outlook (part of Microsoft 365 or standalone purchase).
Ensure Outlook is updated to a relatively recent version for the most accurate menu options.
You should have basic computer navigation skills, including opening menus and clicking on settings.

Check first: Some font size changes, especially those affecting the entire Outlook interface, might be linked to your overall Windows display settings. Changing system-wide display scaling will affect all applications, not just Outlook. Be prepared to revert any changes if they cause issues with other software.

Step-by-Step Instructions

Adjust Default Font Size for New Emails and Replies

This setting controls the font that appears by default when you compose a new email message, reply to an existing one, or forward an email. It’s one of the most common adjustments users make for better readability when typing.

Open Outlook Options: In the Outlook desktop application, click on the 'File' tab in the top-left corner of the window.
Navigate to Mail Settings: From the File menu, click on 'Options' towards the bottom of the left-hand pane. This will open the Outlook Options dialogue box.
Select Stationery and Fonts: In the Outlook Options window, select 'Mail' from the left-hand navigation. Then, on the right side, under the 'Compose messages' section, click the 'Stationery and Fonts...' button.
Change Font for New Messages: In the 'Signatures and Stationery' window that appears, look under the 'Personal Stationery' tab. You'll see options for 'New mail messages', 'Replying or forwarding messages', and 'Composing and reading plain text messages'.
Click 'Font...' for New Mail: To change the default font for new emails, click the 'Font...' button next to 'New mail messages'.
Select Your Desired Font and Size: A new 'Font' dialogue box will open. Here, you can choose your preferred Font, Font style (e.g., Regular, Italic, Bold), and most importantly, the Size. Select a size that is comfortable for you to type and for others to read.
Repeat for Replies/Forwards: It's a good practice to repeat step 5 and 6 for 'Replying or forwarding messages' to maintain consistency in your communication. This ensures your replies use the same clear font size.
Confirm Changes: Click 'OK' in the Font dialogue box, then 'OK' in the Signatures and Stationery window, and finally 'OK' in the Outlook Options window to apply all your changes.

Tip: While you can choose any font, sticking to common, easy-to-read fonts like Calibri, Arial, or Times New Roman ensures your emails display correctly for recipients who may not have less common fonts installed.

Adjust Font Size for Reading Incoming Messages (Temporary Zoom)

If you only occasionally need to zoom in on an email you're reading, Outlook offers a quick and easy temporary zoom feature that doesn't change your default settings.

Open an Email: Double-click any email to open it in its own window, or simply select an email to view it in the reading pane.
Locate the Zoom Slider: Look at the very bottom-right corner of the Outlook window (or the opened email window). You should see a percentage display (e.g., "100%") and a small slider.
Adjust the Zoom:
- Click the '+' button to increase the font size.
- Click the '-' button to decrease the font size.
- Drag the slider to quickly set your desired zoom level.
- Click on the percentage number itself to open a 'Zoom' dialogue box where you can select a specific percentage or choose to have Outlook remember your zoom setting for future messages.
View Changes Instantly: The font size of the email content will change immediately as you adjust the slider or select a percentage.

This temporary zoom is ideal for quick adjustments while reading specific emails. If you want a permanent change to how all incoming messages are displayed, you'll need to follow the next step.

Set Default Font Size for Reading Incoming Messages (Permanent)

For those who prefer a consistent larger or smaller font for all messages they receive, Outlook allows you to set a default viewing font. This affects how messages appear in your reading pane or when opened.

Open Outlook Options: Just like before, click the 'File' tab, then select 'Options'.
Navigate to Mail Settings: In the Outlook Options window, select 'Mail' from the left-hand menu.
Select Stationery and Fonts: Click the 'Stationery and Fonts...' button.
Change Font for Composing and Reading Plain Text: In the 'Signatures and Stationery' window, look under the 'Personal Stationery' tab. For reading messages, the key is the setting for 'Composing and reading plain text messages'. Even if most emails aren't plain text, this setting often influences the default viewing font. Click the 'Font...' button next to this option.
Choose Desired Font and Size: In the Font dialogue box, select your preferred Font, Font style, and Size for reading.
Confirm and Apply: Click 'OK' in the Font dialogue box, 'OK' in the Signatures and Stationery window, and finally 'OK' in the Outlook Options window. Outlook may need to be restarted for these changes to fully take effect across all existing and new messages.

Tip: If you find that this setting doesn't fully affect all rich HTML emails (which might override your default), remember the temporary zoom slider (Step 2) is always available for quick adjustments on specific messages.

Adjust Font Size for Outlook Folder Pane and Other UI Elements

Changing the font size for the Outlook interface itself, such as the folder list, message list (Inbox, Sent Items), and the ribbon, is generally controlled by your Windows display settings, rather than specific Outlook options. Outlook largely respects the scaling settings of your operating system.

Access Windows Display Settings:
- Right-click anywhere on your desktop background and select 'Display settings'.
- Alternatively, go to 'Start' > 'Settings' > 'System' > 'Display'.
Adjust Scale and Layout: In the 'Display' settings, look for the 'Scale & layout' section. You'll see a drop-down menu under 'Change the size of text, apps, and other items'.
Select a Scaling Percentage: Choose a higher percentage (e.g., 125% or 150%) to make text and icons larger across your entire system, including Outlook's interface. Conversely, choose a lower percentage (e.g., 100%) to make them smaller.
Apply and Check Outlook: After selecting a new scaling percentage, Windows will apply the changes (you might need to sign out and back in, or restart your computer for some changes to take full effect, though often it's instant). Open Outlook and check if the folder pane, message list, and ribbon text are now at a more comfortable size.

It's important to note that this is a global change, affecting all applications on your computer. If you only want to change Outlook, this might be a compromise. However, for a fully accessible experience, system-wide scaling is often the most effective method.

Caution: Changing system-wide display scaling can sometimes cause issues with older applications or specific layouts, making them appear blurry or misaligned. Test the changes thoroughly across all your frequently used software.

Customise Font Size in Calendar Views

The Calendar view in Outlook has its own set of display options, allowing you to tailor the font size for event details and time labels.

Switch to Calendar View: In Outlook, click on the 'Calendar' icon in the navigation pane (usually at the bottom-left).
Access View Settings: In the ribbon at the top, click on the 'View' tab. Then, click 'View Settings'.
Open Other Settings: In the 'Advanced View Settings' dialogue box, click on the 'Other Settings...' button.
Adjust Font Sizes: In the 'Other Settings' window, you'll find options to change fonts for various calendar elements:
- 'Font for time in Day/Week/Month view': Click 'Font...' next to this to change the font and size of the time labels on your calendar.
- 'Font for messages in Calendar, Contacts, and Tasks': This option might influence how event details or task descriptions appear within the calendar view. Click 'Font...' to adjust its size.
Confirm Changes: Select your desired font and size for each element, click 'OK' on the Font dialogues, then 'OK' on the 'Other Settings' window, and finally 'OK' on the 'Advanced View Settings' window to apply.
Use the Zoom Slider for Event Details: Similar to email messages, when you have a calendar view open (especially Day or Work Week), look for the zoom slider in the bottom-right of the Outlook window. This can quickly adjust the size of the *content* within your calendar entries without affecting the time labels.

Tip: Experiment with different fonts and sizes for calendar elements. A slightly larger font for the time labels can make your schedule much clearer at a glance, especially on larger monitors.

Quick Reference

Situation	Use this	Why
New emails you compose	File > Options > Mail > Stationery and Fonts > New mail messages > Font...	Sets the default font and size for all your outgoing emails.
Replies and forwarded emails	File > Options > Mail > Stationery and Fonts > Replying or forwarding messages > Font...	Ensures consistency in your replies and forwards.
Temporary zoom on a specific incoming email	Zoom slider at bottom-right of Outlook window (or opened message)	Quickly adjusts text size for individual messages without permanent changes.
Default font for all incoming messages	File > Options > Mail > Stationery and Fonts > Composing and reading plain text messages > Font...	Aims to make all received messages appear in a preferred default size.
Outlook navigation pane, folder list, message list, ribbon text	Windows Settings > System > Display > Scale	Outlook's interface elements often scale with system-wide display settings.
Calendar time labels or event details	Calendar View > View tab > View Settings > Other Settings > Font...	Specific controls for customising your calendar's visual elements.

Common Problems When You Change Outlook Font Size

Changes don't seem to apply: After making changes in Outlook Options, you often need to click 'OK' on all open dialogue boxes (Font, Signatures and Stationery, Outlook Options) for them to save. Sometimes, restarting Outlook is also necessary for the changes to fully take effect, especially for default reading fonts.
Only parts of Outlook changed: Outlook has different font settings for different areas (composing, reading, UI). If only one part changed, you likely adjusted the setting for that specific area. Refer back to the step-by-step guide to target the exact area you want to modify (e.g., Folder Pane needs Windows Display settings, not Outlook settings).
Rich HTML emails ignore default font settings: Many incoming emails are designed with their own specific HTML and CSS, which can override your default reading font settings. In these cases, the temporary zoom slider (Step 2) is your best tool for on-the-fly adjustment.
Outlook interface looks blurry or too big/small after Windows scaling: If you adjusted the 'Scale & layout' in Windows Display Settings, and other apps or Outlook itself now looks odd, you might have chosen an unsupported scaling level for your screen resolution. Try a different, standard scaling option (e.g., 100%, 125%, 150%) or reset to the 'Recommended' setting.
Calendar view doesn't change much: The 'Other Settings' in Calendar View control specific labels. For the content of appointments themselves, the general Outlook UI scaling (via Windows) or the temporary zoom slider (if you have an event opened or selected) might be more effective.

Check first: Always ensure you have closed all relevant dialogue boxes by clicking 'OK' to save your changes. If issues persist, try restarting Outlook.

Advanced Tips for How To Change Outlook Font Size

Use Custom DPI Scaling (Windows): For advanced users who need more granular control than the standard 100%, 125%, 150% options, Windows allows you to set a custom scaling percentage. You can find this by clicking "Advanced scaling settings" in the Display settings. Be cautious, as non-standard scaling can sometimes lead to text rendering issues in some applications.
Accessibility Options in Windows: Beyond simple scaling, Windows offers dedicated accessibility features. The Magnifier tool (Windows key + Plus sign) can magnify any part of your screen, offering a powerful way to temporarily enlarge text in Outlook or any other application. This is especially useful for those with significant visual impairments.
Consider Outlook Themes: While themes don't directly change font size, some themes (e.g., 'Black' or 'Dark Grey') can improve contrast, making existing font sizes easier to read. You can change your theme under File > Options > General > Personalize your copy of Microsoft Office > Office Theme.
Apply Conditional Formatting (Advanced): For specific email messages (e.g., from certain senders, or with specific subjects), you can use conditional formatting to make them appear in a larger or different coloured font in your message list. Go to View tab > View Settings > Conditional Formatting. This won't change the font inside the message itself but can highlight important emails in the inbox.
Keyboard Shortcuts for Zoom: When an email is open in its own window, you can use Ctrl + Mouse Wheel Up/Down to quickly zoom in or out, similar to many web browsers. This is a very fast way to adjust text size on the fly for an individual message.
Understand Plain Text vs. HTML: Remember that plain text emails offer the most control over font size from your end. HTML emails, however, are web pages essentially, and their appearance is largely dictated by the sender's design choices. Your default settings will have less impact on these.