Attachment Issues

Fix Outlook Web Signature Image Not Showing to Recipients

Guest Writer Oct 12, 2026 869 views

Question details

The user needs to make their Outlook web signature image visible to recipients instead of it displaying as a blank rectangle.

How to Fix Outlook Web Signature Image Not Showing to Recipients

Product: Outlook Web
Device & OS: not provided
Scenario: Sending emails from Outlook Web with a signature that contains a linked image.
Observed behavior: The linked signature image appears correctly to the sender but displays as a blank rectangle for recipients using external email clients like Gmail and Outlook.

Before you start

Ensure you have a high-quality PNG version of your signature image saved locally on your device, as you will need to upload it directly to your email settings.

Solution 1Recommended

Embed the Signature Image Directly in Outlook Web

Prevent recipient email clients from blocking external links by uploading the image file directly into your signature block.

Many email clients, including Gmail and desktop Outlook, actively block externally linked images by default to protect user privacy. When you link an image (like from a HubSpot signature generator), it often appears as a blank rectangle to the recipient unless they manually click to download pictures.

Access Outlook Web Settings

Log into your Outlook Web account, click the Settings (gear icon) in the top right corner, and select 'View all Outlook settings' at the bottom of the pane.

Navigate to the Signature Editor

In the settings menu, go to 'Mail' and then click on 'Compose and reply' to access your email signature text box.

Insert the Image Inline

Remove the existing broken linked image. Click the 'Insert pictures inline' icon (it looks like a small landscape) located on the signature formatting toolbar.

Upload and Save

Select the local PNG image file of your signature from your computer. Resize it if necessary, ensure the boxes to automatically include the signature are checked, and click 'Save'.

Embed the Signature Image Directly in Outlook Web

Test Before Sending: Send a test email to a personal Gmail or alternative Outlook account to confirm the image displays properly without requiring the recipient to manually download pictures.

Solution 2

Contact Microsoft 365 Admin for Persistent Blocking

If even locally embedded images fail to show, organizational security policies might be stripping inline attachments.

Free Microsoft Office alternative

Use WPS Office for Professional Document Creation

While you troubleshoot your Outlook web signature, consider WPS Office as a lightweight, powerful, and completely free alternative to Microsoft Office. It offers robust tools for creating professional documents and graphics seamlessly.

1. Download the Installer: Visit the official WPS Office website and click the free download button for your operating system.
2. Install WPS Office: Run the downloaded installer and follow the quick on-screen instructions to set up the software.
3. Create Professional Assets: Open WPS Presentation or WPS Writer to start designing layouts, graphics, and documents with full Microsoft format compatibility.

Fully compatible with Microsoft Office formats (.docx, .xlsx, .pptx).Lightweight installation with a familiar, easy-to-navigate user interface.Design crisp, professional email signature graphics and layouts using WPS Presentation.Seamless all-in-one suite to manage documents, spreadsheets, and PDFs.

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Frequently Asked Questions

Why do my email signature images show as blank rectangles to recipients?

Email clients often block externally linked images by default to prevent tracking and save bandwidth. Recipients must manually click 'download pictures' to view them, which is why linked images show as blank boxes initially.

Which image format is best for Outlook web signatures?

PNG is highly recommended for email signatures because it maintains high visual quality, supports transparent backgrounds, and is universally supported by all major email clients including Outlook, Apple Mail, and Gmail.

Does embedding a signature image increase the email file size?

Yes, embedding an image attaches the file to every email you send, slightly increasing the size of your message. To minimize this impact, compress your PNG image to a small file size (ideally under 50KB) before inserting it into your signature.

Outlook & Email Problems