How to Update Your Signature in Outlook

Sent emails with outdated job titles or missing phone numbers look unprofessional. How to Update Your Signature in Outlook covers the exact clicks needed in the desktop app, Outlook on the web, and the mobile apps so your signature stays current. The steps below take only a minute once you know the menus.

Update Your Signature in Outlook: What Changes Between Versions

Outlook stores signatures differently depending on whether you use the full desktop program linked to Microsoft 365 or Exchange, the browser version, or the phone app. Desktop signatures live in a local settings file, while web and mobile signatures are stored in your Microsoft account. Confirm which version you open most often before you begin so you edit the correct one.

How to Update Your Signature in Outlook Desktop App

1. Open the Signatures dialog

   Launch the Outlook desktop application. Click File in the top-left corner, then Options at the bottom of the left sidebar. In the Outlook Options window select Mail from the left column, scroll to the Compose messages section, and click the Signatures button.

   

2. Choose or create the signature to edit

   In the Signatures and Stationery window the top list shows all existing signatures. Click the one you want to change, or click New, type a name such as “Work 2026”, and press OK. The large editing box below now displays the current text and formatting.

3. Replace the content and formatting

   Delete old text and type the new details. Use the formatting toolbar to match fonts, add a logo image via the picture icon, or insert a hyperlink. When finished, click Save to keep the changes.

4. Set the signature as default for new messages and replies

   At the bottom of the same window use the two dropdown menus labeled “New messages” and “Replies/forwards” to select the updated signature. Click OK twice to close all windows. Create a test email to confirm the signature appears automatically.

   

Common Problems When You Update Your Signature in Outlook

• The signature does not appear on new emails: return to the Signatures dialog and make sure the correct signature is chosen in both dropdown menus.
• Formatting looks different on the recipient’s screen: avoid unusual fonts; stick to Calibri or Arial and test by sending to a Gmail account.
• Changes made on the web do not show in the desktop app: the two versions do not sync signatures automatically; repeat the steps inside the desktop program.
• Images disappear: insert the logo as a small file under 100 KB and host it on a public URL instead of embedding if recipients often use older mail clients.

Frequently Asked Questions

Can I have multiple signatures in Outlook?

Yes. Create as many as you need in the Signatures dialog and switch between them manually from the Insert > Signature menu while composing a message.

Does updating the signature affect old sent emails?

No. Only new messages and replies use the current signature. Previously sent messages keep the version that existed when they were sent.

How do I update the signature on my phone?

Open the Outlook mobile app, tap your profile icon, choose Settings, tap Signature, then edit the text and save. The change applies only to emails sent from that device.

Conclusion

Keeping your Outlook signature current takes only a few clicks once you know the exact path in each version. Follow the steps above and your emails will always display accurate, professional contact information.