Outlook Signatures Not Showing

If your Outlook email signature disappears from new messages, fails to auto-apply, or loses its formatting, the issue is typically caused by misconfigured signature settings, corrupted signature files, or a recent Office update that reset your preferences. This guide helps you restore your signatures.

Step 1: Verify Signature Assignment Settings

Signatures may exist but not be assigned to new messages or replies.

1. Open Outlook and go to File > Options > Mail.
2. Click Signatures (or go to Home > New Email > Signature > Signatures).
3. In the Email Signature tab, check the dropdown menus at the top right:
   • E-mail account — select the account you want the signature for
   • New messages — select your desired signature from the dropdown
   • Replies/forwards — select the signature (or “(none)” if you don’t want one for replies)
4. If the dropdowns show “(none)”, your signature is not assigned — select the correct one.
5. Click OK and compose a new email to verify the signature appears.
6. On macOS, go to Outlook > Preferences > Signatures and verify the signature is assigned to the correct account.

Step 2: Check the Signature Files on Disk

Outlook stores signature files locally, and if these files are deleted or corrupted, the signature will not appear.

On Windows:

1. Open File Explorer and navigate to:

%APPDATA%\Microsoft\Signatures\

2. Each signature is stored as three files:
   • signature_name.htm — HTML version
   • signature_name.rtf — Rich Text version
   • signature_name.txt — Plain Text version
   • Plus a folder called signature_name_files containing images and CSS
3. If these files are missing, your signature has been deleted and needs to be recreated.
4. If the files exist, open the .htm file in a browser to verify the content is correct.

On macOS:

1. Open Finder and navigate to:

~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/Main Profile/Data/Signatures/

2. Check that your signature files are present and not empty.
3. If files are missing, recreate the signature through Outlook > Preferences > Signatures.

Step 3: Fix Signatures Lost After Office Update

Office updates sometimes reset signature settings or corrupt the signature directory.

1. Check if your signature files still exist on disk (see Step 2).
2. If the files are intact but signatures are not assigned:
   • Open File > Options > Mail > Signatures
   • Re-assign the signature to your accounts in the dropdown menus
3. If the files were deleted during the update:
   • Check the Recycle Bin for files from the Signatures folder
   • Restore them to %APPDATA%\Microsoft\Signatures\
4. If you use Microsoft 365 roaming signatures (cloud-stored signatures):
   • Go to File > Options > Mail and check if Store my signatures in the cloud is enabled
   • If enabled, signatures sync from the cloud — try signing out and back into your Microsoft account
5. Disable roaming signatures if they are causing conflicts with locally created ones:

reg add "HKCU\Software\Microsoft\Office\16.0\Outlook\Setup" /v DisableRoamingSignaturesTemporaryToggle /t REG_DWORD /d 1 /f

6. Restart Outlook and verify your signatures are restored.

Step 4: Resolve Formatting and Image Issues

Signatures that appear correctly in the editor but lose formatting when sent often have HTML or image problems.

1. Check your message format:
   • Go to File > Options > Mail
   • Under Compose messages, ensure Compose messages in this format is set to HTML
   • If set to Plain Text, signatures will lose all formatting and images
2. If images in your signature appear as red X boxes or are missing:
   • Open the signature files folder: %APPDATA%\Microsoft\Signatures\signature_name_files\
   • Verify the image files (PNG, JPG) are present
   • Re-add images through the signature editor if they are missing
3. For images hosted online, ensure they use HTTPS URLs — many email clients block HTTP-loaded images.
4. Avoid using Word to create signatures, as it generates bloated HTML that renders inconsistently across email clients.
5. Keep signature images under 100 KB each to prevent delivery issues and slow loading for recipients.

Step 5: Manage Signatures Across Multiple Devices

If your signature appears on one device but not another, synchronization settings may need adjustment.

1. Microsoft 365 Roaming Signatures syncs signatures across devices automatically:
   • Go to File > Options > Mail and ensure cloud signature sync is enabled
   • Sign into the same Microsoft account on all devices
2. If roaming signatures are not available, manually export and import:
   • Copy all files from %APPDATA%\Microsoft\Signatures\ to a USB drive or cloud storage
   • Paste them into the same folder on the other device
3. For organization-wide signatures managed by IT:
   • Check with your administrator if signatures are deployed via Exchange transport rules or CodeTwo / Exclaimer add-ins
   • Server-side signatures will not appear in the Outlook compose window — they are added during delivery
4. On the Outlook mobile app, signatures are managed separately:
   • Go to Settings > Signature within the app
   • Mobile signatures support plain text only — HTML formatting is not available