10.Use Image Alt Tags
HTML “alt” tags display a text description of an image either when the image does not display or when a cursor rolls over a displayed image. Using alt tags in your HTML emails is important for three reasons:
Recipients using dial-up or other slow connections might not see images for several seconds. Displaying alt tag text can convey what is to come.
Many email clients (Outlook and Outlook Express) and email services (AOL, Yahoo and Gmail) disable images by default or display a warning message or command to download the images.
Gmail uses what it calls “snippets,” which display the first few text words it sees in an email, following the subject line. Gmail will also display the text from alt tags, so it is important to use this to your advantage – as an addendum to your subject line, for example.
A sample alt tag looks like this:
<img name=”index_r2_c2″ src=”http://mailer.aghreni.net/imgproxy/img/809298233/index_r2_c2.jpg” width=”163″ height=”85″ border=”0″ alt=”Aghreni logo” border=0>
Tips on using alt tags
For logos, headers, section titles and other uses of images, describe the logo and image, but consider adding a brief teaser that explains that section of the email. If your email is a newsletter, an example of an alt tag that serves as both a teaser and a text version of the image might be: “Optimization — Strategies for improving email marketing performance”.
Include short but complete descriptions of product photos or offers such as “50% off”.
Charts and Graphs:
Include enough text to explain the value and contents of the chart or graph, such as “Chart: Open Rates from A/B Split Test”.
Gmail Snippets/Preview Text:
Use an appropriate image in your header to display key teaser info. For ec-ommerce emails, the information might expand on special offers mentioned in the subject line, reinforce Free Shipping or promote additional products. For newsletters, consider mentioning additional articles beyond what is in the subject line, or expand on the existing topic.
While this sounds like a lot of work, at most it probably adds 5 to 10 minutes to your email production. Most importantly though, marketers who don’t use alt tags appropriately risk lower open and click-through rates because recipients might decide not to display images or act further.
Read earlier blogs on “Guide to a Better HTML Email Design” on Kenscio Blog.