This guide covers installing your Signkit signature in all versions of Outlook: Windows desktop, Mac, and Outlook Web (OWA).
Campaign banners update automatically! Once your signature is installed, any changes to campaign banners in Signkit will appear in Outlook within 5 minutes - no reinstallation required.
Outlook for Windows (Desktop)
Method 1: Copy & Paste
Step 1: Copy Your Signature
- Log in to Signkit
- Go to Signatures in the sidebar
- Click on a signature to open it
- Click Copy HTML in the preview panel
Step 2: Open Outlook Settings
- Open Outlook
- Click File → Options
- Click Mail in the left sidebar
- Click Signatures... button
Step 3: Create New Signature
- In the Signatures dialog, click New
- Enter a name (e.g., "Work Signature")
- Click OK
Step 4: Paste Your Signature
- Click in the "Edit signature" text area
- Paste your signature (Ctrl + V)
- The formatted signature should appear
Step 5: Set Defaults
Configure when to use this signature:
- New messages: Select your signature
- Replies/forwards: Select your signature or "None"
- E-mail account: Choose the account to apply this to
Step 6: Save and Test
- Click OK to close the dialog
- Create a new email to verify the signature appears
- Send a test email to check appearance
Method 2: Direct File Installation
For more reliable results, especially with complex signatures:
Step 1: Download Signature File
- In Signkit, go to your signature
- Click Download
- Select Outlook Format (.htm)
- Save the file
Step 2: Locate Signatures Folder
Navigate to:
C:\Users\[YourUsername]\AppData\Roaming\Microsoft\SignaturesTo access AppData:
- Press
Win + R - Type
%appdata%\Microsoft\Signatures - Press Enter
Step 3: Copy Files
Copy the downloaded .htm file to the Signatures folder.
Step 4: Restart Outlook
Close and reopen Outlook for the signature to appear in your list.
Outlook for Mac
Step 1: Copy Your Signature
- Log in to Signkit
- Go to Signatures in the sidebar
- Click on a signature to open it
- Click Copy HTML in the preview panel
Step 2: Open Preferences
- Open Outlook
- Click Outlook → Preferences (or press
Cmd + ,) - Click Signatures
Step 3: Add New Signature
- Click the + button
- Enter a name for your signature
- Click in the editor area
Step 4: Paste Signature
- Paste your signature (Cmd + V)
- Verify the formatting looks correct
Step 5: Set as Default
- Select your email account
- Choose your signature for "New messages"
- Choose for "Replies/forwards" if desired
Step 6: Close and Test
Close preferences and compose a test email.
Outlook Web (OWA)
For Outlook.com and Office 365 web access:
Step 1: Copy Your Signature
- Log in to Signkit
- Go to Signatures in the sidebar
- Click on a signature to open it
- Click Copy HTML in the preview panel
Step 2: Open Settings
- Go to outlook.com or your Office 365 webmail
- Click the gear icon (top right)
- Click View all Outlook settings
Step 3: Navigate to Signatures
- Click Mail (left sidebar)
- Click Compose and reply
Step 4: Create/Edit Signature
- Under "Email signature", click in the editor
- Clear any existing content
- Paste your signature (Ctrl/Cmd + V)
Step 5: Configure Options
- Check "Automatically include my signature on new messages"
- Check "Automatically include my signature on messages I forward or reply to"
Step 6: Save
Click Save at the bottom of the settings panel.
Office 365 / Microsoft 365 Admin
For organization-wide deployment:
Using Transport Rules
Administrators can add signatures server-side:
- Go to Exchange Admin Center
- Navigate to Mail flow → Rules
- Create a rule to append HTML signature
- Apply to specific users or groups
Using Compliance Features
Office 365 supports disclaimer rules:
- In Exchange Admin, go to Compliance management
- Set up Mail flow rules with disclaimer action
- Configure HTML content for signature
Server-side signatures apply to all messages, including mobile devices, but may not show in sent folder previews.
Troubleshooting
Images Show as Red X
This common issue occurs when images are blocked:
- Check image URLs use HTTPS
- Verify images are publicly accessible
- Try re-hosting images
- See Images Not Displaying guide
Signature Not Appearing
- Verify signature is set as default
- Check the correct email account is selected
- Restart Outlook
- Create a completely new signature
Formatting Issues
- Re-copy the signature from Signkit
- Clear the signature editor before pasting
- Try the file installation method
- Check for conflicting Outlook add-ins
Signature Duplicated in Replies
- In signature settings, set "Replies/forwards" to "None"
- Or use different signatures for new vs. reply emails
Can't Edit Signature
Some organizations lock signature settings. Contact your IT administrator.
Version-Specific Notes
Outlook 2019/2021
Full support for HTML signatures. Use either method above.
Outlook 2016
Works well but may have rendering differences with complex CSS. Test thoroughly.
Outlook New (Windows)
The new Outlook for Windows has different settings:
- Click Settings (gear icon)
- Go to Email → Signature
- Paste your signature
Outlook Mobile (iOS/Android)
- Open Outlook app
- Tap your profile icon
- Tap the gear icon (Settings)
- Select your account
- Tap Signature
- Paste or type your signature
Mobile Outlook has limited HTML support. Use a simplified signature for mobile.
Best Practices
- Test across versions: If your team uses different Outlook versions, test in each
- Keep it simple: Complex signatures may render differently across versions
- Update consistently: When you change your Signkit signature, update Outlook manually