The Email Signature Handbook
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HTML Images in Email Signatures

Whether you should include HTML images in an email signature or not is a much discussed topic. Some believe that email signature images are unnecessary as they do not always appear correctly or can make a signature appear too big. However, we believe that images are one of the most important parts of a signature.

Email signature with HTML images

Why should you use HTML images in email signatures?

Using HTML images in email signatures is a great way to add color and branding to every email you send. When designed correctly, an email signature with imagery is more aesthetically pleasing and helps to give off a professional impression.

If your company uses branding on its business cards and marketing communications, then your email signatures also need to be branded. The best way to add branding to a corporate signature is by including the company logo.

HTML images can also be used to promote your company’s social media networks, awards/certifications and marketing campaigns.

An example of an email signature with a HTML image

What types of images can you include in a signature?

There are many different types of email signature images you can include, all of which have different functions:

  • Company logo - Including a company logo in an email signature helps to raise brand awareness and recognition. By adding a logo to a signature, you are essentially creating a digital business card.
  • Social media icons - Use social media icons to promote your company’s social presence and gain new followers for free.
  • Promotional banner - Different departments can use promotional banners to advertise campaigns such as customer surveys, events or discount sales
  • Awards, certifications and accreditations - Show off your company’s achievements by adding awards, certifications and accreditations to your email signature.
  • Employee photograph - Personalize an email signature by adding an employee photograph.
  • Seasonal images - Showcase a holiday promotion or easily communicate you are open over Christmas by adding seasonal images and promotional banners to your email signature.

Check out our HTML Image Template Gallery for some examples of the types of HTML images you could use.

HTML images in an email signature

Important points to remember

Before adding HTML images to an email signature, there are a few things to be aware of in order to create a fully functioning signature.

There are two methods you can use when adding email signature images. You can either embed the images directly into the signature, or you can host them externally and link to them. Both of these methods have different benefits and limitations, so you need to decide which method works best for you.

Always add ALT text to every image you include in an email signature. If the images do not appear in the recipient’s email, the ALT text will display instead and show what the image is meant to be.

When adding an email signature image, such as a promotional banner, make sure it conforms to your brand guidelines. These will often include a minimum size for the logo, a brand color palette and typography.

Make sure all images you include are the correct dimensions. If you have coded the image to appear smaller in the signature than the image actually is, there is a possibility it may appear at its full size for the recipient.


For more hints and tips on creating the perfect email signature, check out the 17 Email Signature Dos and DON’Ts.


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Recommended reading

Email signature branding

Ensure your email signature branding is consistent for all users

HTML email signature templates

View our library of email signature templates with HTML images

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