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How to Change Signature in Outlook [Web & App]

Master the easy solution on how to change email signature in Outlook with this comprehensive post! Whether you want to realize it on the web, desktop app, or mobile app, here are the steps that you can follow!

July 16, 2025

Why Change Signature in Outlook?

Whether you use Outlook for business or personal use, it's crucial to update your signature for a number of reasons. The following are the main reasons for changing your Outlook signature:

  • Update Contact Information: If your phone number, job title, company address, or email has changed, updating your signature ensures that recipients have your correct contact details.
  • Professional Branding: A polished, branded signature reinforces your personal or company identity. Updating it to reflect new logos, colors, or taglines helps maintain a consistent and modern image.
  • New Role or Company: When you switch jobs or receive a promotion, your signature should reflect your current role, department, or employer.
  • Seasonal or Promotional Messages: Some users change their signature to include holiday greetings, special announcements, event links, or marketing campaigns.
  • Fix Errors or Outdated Information: Typos, broken links, or old titles can make your emails look unprofessional. Updating your signature ensures accuracy and credibility.

How to Change Signature in Outlook

It is quite easy to update signature in Outlook 365. In this part, you can see the specific steps for doing so on the Outlook web, desktop app, and mobile app.

Way 1. How to Change Email Signature in Outlook (Web)

Step 1. Open the Outlook website and sign in to your account.

Step 2. Click the gear icon in the upper-right corner to open settings.

Step 3. Go to the “Account” tab and choose “Signatures”.

Choose Signatures

Step 4. Change or add a new signature.

Way 2. How to Edit Signature in Outlook (New Outlook Desktop App)

Step 1. Enter new Outlook in the Start menu and open the Outlook desktop app. Then, log in to your account.

Step 2. Click the gear icon in the upper-right corner to open settings.

Step 3. Go to the “Account” tab and choose “Signatures”.

Choose Signatures

Step 4. Change or add a new signature.

Way 3. How to Create Email Signature in Outlook (Classic Outlook Desktop App)

Step 1. Enter classic Outlook in the Start menu and open the Outlook desktop app. Then, log in to your account.

Step 2. Select “Message” and choose “Signature” > “Signatures”.

Select Sinatures

Step 3. Click the previous signature or select “New” to add a new signature. Then, compose your new signature and click “OK” to save it.

Way 4. How to Setup Email Signature in Outlook (Mobile App)

Step 1. Open the Outlook app on your mobile phone.

Step 2. Tap on your profile and click the gear icon.

Step 3. Choose “Signature” and click the previous one. Then, compose the new signature in the blank.

How to Change Signature in Outlook Mobile App

Why Can't I Edit My Signature in Outlook 365?

Although you follow every step on how to change signature in Outlook, you cannot change it. Why does it happen? Here are the most common reasons and how to troubleshoot them:

1. Admin Restrictions (Microsoft 365 Policies)

It's possible that the IT administrator at your company has turned off the ability to modify or add signatures by Microsoft 365 compliance policies. 

► Fix: You can contact your IT department to check if signature control is managed centrally.

2. Web Browser Does Not Allow You to Change

If you’re using Outlook on the web and don’t see the signature option, it could be due to a restricted browser environment or settings not loading properly.

► Fix:

  • Ensure you're signed in to the correct Microsoft 365 account.
  • Try a different browser or clear your cache and reload the page.
  • Navigate to Settings > Mail > Compose and reply to find the signature editor.

3. Outlook Desktop App Glitch

Outlook's desktop version occasionally has problems with the Signature window not opening or responding.

► Fix:

Step 1. Restart your computer or Outlook.

Step 2. Press Windows + R, type outlook.exe /safe, and hit Enter to launch Outlook in safe mode.

Step 3. Try going to File > Options > Mail > Signatures to view the signature.

4. Signature Managed by Add-ins

The built-in signature feature can be overridden by third-party tools (such as Exclaimer and CodeTwo).

► Fix:

Step 1. Verify whether your business makes use of a signature management system.

Step 2. Change your signature on the third-party platform.

5. Making Use of Outlook with a Restricted License

Outlook may have certain features that are restricted depending on your Microsoft 365 subscription, or whether you're using a web-based shared mailbox with limited access.

► Fix:

  • Under File > Office Account, verify the type of license you have.
  • Verify that you are not attempting to change a signature for a delegated or shared mailbox.

Conclusion

With this post, how to change signature in Outlook will never be a problem for you! You can choose a preferred way to change the old signature on the Outlook website, the new desktop app, the classic desktop app, and the mobile app.

Additionally, if you plan to download emails from Outlook, you can try MultCloud to download multiple emails at once. It can also convert the emails into PDF before downloading. Get started with MultCloud for free!

Quickly transfer, sync or backup files from one cloud to another.

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