Images render smaller in the email signature in Outlook

Short answer:
Images may appear smaller in Classic Outlook for Windows due to display scaling (DPI settings). This issue does not typically affect the New Outlook.

Why this happens

In Classic Outlook for Windows, image rendering is affected by Windows display scaling (for example, 125% or 150%).

• Outlook uses Microsoft Word as its rendering engine
• Images may be scaled incorrectly when the DPI is above 100%
• This can cause logos and graphics to appear smaller than intended

Recommended solution

The most reliable way to fix this is to rebuild or upload your email signature through Xink:

• Upload your signature from Outlook into Xink
  Learn how
• Or recreate the signature using the Xink built-in designer

Advanced fix (Classic Outlook only)

If you are using Classic Outlook, you can enforce correct image scaling by adding the following code to your signature template:

Open your signature in Xink and click Source:

Then add this code at the top of your signature:

<!--[if gte mso 9]>
<xml>
  <o:OfficeDocumentSettings>
    <o:AllowPNG/>
    <o:PixelsPerInch>96</o:PixelsPerInch>
  </o:OfficeDocumentSettings>
</xml>
<![endif]-->

This ensures Outlook uses a consistent pixel density (96 PPI), preventing unwanted image scaling.

Summary

• The Issue mainly affects Classic Outlook for Windows
• Caused by DPI/display scaling above 100%
• Fixed by rebuilding the signature or applying the PPI code
• New Outlook is generally not affected