Short answer:
Outlook on Windows compresses images to 220 PPI after sending. If your image does not match that setting, it may look sharp while composing but appear blurry or pixelated to recipients.
An image in your email signature can become unsharp after sending, even if it looks fine while you are composing the email.
This happens because Outlook 365 for Windows compresses images automatically after the email is sent. Xink does not change your images or reduce their quality.
Why does this happen?
If the uploaded image does not conform to Outlook’s image handling, Outlook may recompress it, reducing the recipient's visible quality.
The most common cause is that the image is not optimized for Outlook’s default 220 PPI compression behavior.
Step-by-Step: Prevent Outlook from compressing the image
The quickest fix is to enable Do not compress images in the file in Outlook or Office.
Alternative fix: Re-render the image at 220 PPI
If needed, you can also re-render your images at 220 PPI. In most cases, this does not result in a noticeable loss of quality.
This helps Outlook handle the image more predictably after sending.
Using Photoshop
If you use Photoshop to resize or export the image, use these settings:
- Resample = Preserve Details
- Reduce Noise = 100%
Still an issue?
If the image still looks blurry after sending, try switching image format:
- If JPG looks blurry, try PNG
- If PNG looks blurry, try JPG
Tip: PNG often works well for logos or images with background colors, while JPG may work better for photos.
What this means for email signatures
If an image becomes blurry only after sending, the issue is caused by Outlook on Windows—not by Xink.
To get the best result, optimize your image for Outlook or disable Outlook’s image compression.
