How to Update Email Signature in Outlook

Sent messages with an old job title or missing phone number can hurt your professional image. Knowing how to update email signature in Outlook ensures your contact details stay current across every email. This guide covers the exact menu paths for both the desktop application and Outlook on the web.

Outlook Email Signature Basics Before You Begin

Outlook stores signatures separately for new messages and replies. The desktop version saves signatures as rich text files on your computer, while the web version keeps them in your Microsoft 365 account. Make sure you are signed in with the correct Microsoft account before starting so changes apply to the mailbox you actually use.

How to Update Email Signature in Outlook Desktop Application

1. Open Signature Options from the File Menu

   Launch Outlook on Windows or Mac. Click File in the top-left corner, then select Options. In the Outlook Options window choose Mail from the left sidebar and click the Signatures button near the bottom of the right pane.

   

2. Edit or Create Your Signature Text

   In the Signatures and Stationery dialog, select an existing signature from the list or click New to create one. Type or paste your updated details in the edit box. Use the formatting toolbar to adjust fonts, add hyperlinks, or insert a small company logo image.

3. Set Default Signatures for New Messages and Replies

   Under the Choose default signature section, pick your updated signature for the New messages dropdown and the Replies/forwards dropdown. Click OK to save. Outlook now applies the new signature automatically.

   

Update Email Signature in Outlook on the Web

Sign in at outlook.office.com. Click the gear icon, select View all Outlook settings, then choose Mail followed by Compose and reply. Scroll to the Email signature box, replace the old text with your updated version, and toggle the option to automatically include your signature on new messages or replies. Click Save when finished.

Common Problems and Quick Fixes

• If the signature fails to appear, verify you selected the correct mailbox account in the Signatures dialog.
• Formatting that looks broken on mobile often comes from copied content; retype the signature directly in Outlook instead of pasting.
• Multiple mailboxes require repeating the process for each account listed in the drop-down menu.
• Signatures longer than a few lines may get truncated on some mobile clients, so keep contact details concise.

Frequently Asked Questions

Can I add a photo or logo to my Outlook signature?

Yes. In the desktop app use the picture icon in the formatting toolbar. On the web, click the image button inside the signature editor and upload a small PNG or JPG file under 100 KB for best results.

Will updating the signature affect emails already sent?

No. Changes only apply to future messages. Previously sent emails keep the signature that existed at the time they were sent.

Does the update sync across devices?

Desktop signatures stay local to that computer. Web signatures stored in Microsoft 365 sync automatically to any device using the same account.

Conclusion

Following the steps above lets you update email signature in Outlook quickly and keep every message looking professional.