How to resize blurry image in signature in Outlook?

Although you can’t format images in the signature editor, you can copy and paste formatted images into the signature editor. Therefore, we can resize the image in the message body, and then copy it into the signature. Please do as follows:

1. In the "Mail" view, create a new email by clicking "Home" > "New Email".

2. In the new Message window, click "Insert" > "Signature", and then select the signature whose image you want to resize from the drop-down list. See screenshot:

3. Now the selected signature is inserted into the message body. Right-click the image you want to resize, and select "Size and Positions" from the right-clicking menu. See screenshot:

4. In the opening Layout dialog box, type the percentage you want to resize the images to into both "Height" and "Width" boxes in the "Scale" section, and click the "OK" button.

Note: You can also select the image you want to resize, and then resize it by dragging its edge as needed.

5. Now the image has been resized in the message body. Select the whole signature in the message body, and then copy it by pressing "Ctrl" + "C" keys simultaneously.

6. Click "Insert" > "Signature" > "Signatures". See screenshot:

7. In the opening Signatures and Stationery dialog box, please: (1) In the "Select signature to edit" box, select the signature whose image you want to resize; (2) In the "Edit signature" box, clear the original signature content, and then paste the copied signature content by pressing "Ctrl" + "V" keys simultaneously; (3) Click the "OK" button.

So far, the image in the specified signature has been resized already.

8. Close the message window as needed.

If you are familiar with HTML code, you can resize images in a signature by changing the specified signature’s HTM file.

1. Open a folder on your computer, paste the below folder path into the "Address" box, and press the "Enter" key.
Folder path of Outlook signatures: %AppData%\Microsoft\Signatures

2. In the opening folder, right-click the HTML file of the specified signature whose image you want to resize, and select "Open with" > "Notepad" from the right-clicking menu. See screenshot:

Now the HTML file of the specified signature opens in Notepad.

3. Press "Ctrl" + "F" keys simultaneously to open the Find dialog box, type the image name (or any other keywords, such as <img) into the "Find what" box, and click the "Find Next" button until you find the code about the image.

4. Now change the values of width and height in the code as needed.

5. Save the code, and close Notepad.

So far the image in the specified signature has been resized.

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