What are Image Alt Tags?
Image alt tags are words or groups of words that a browser will associate with an image. Have you ever gone to a website where the images wouldn’t load? In their place, you saw a box with some words in the corner. That’s an image alt tag… the words associated with the image.
Image Alt Tags for the Visually Impaired
Unfortunately, many websites neglect the visually impaired. Individuals who are visually impaired use the Internet just as much as anyone else; they just need some assistance. In many cases, they use browsers that read content aloud. Since the browser can’t see the image and describe it based on looks, it will instead read the image alt tags to the site’s visitor. For that reason, you want to make your alt tag descriptive. Many times the alt tag defaults to an image’s file name, which rarely helps. The term “JPEG1” or “logo” does nothing to describe an image and would only frustrate a visually impaired user. It also looks very unprofessional.
How Can Image Alt Tags Improve my SEO?
Search engines can read, but they cannot see pictures. Image alt tags are the solution. Search engines read and catalog the text on a web page. If an image has no alt tag, they will skip right over it. When you go to Google Images and search for a photo, you usually get lots of choices for your image search, and they are completely based upon image alt tags. If I posted a picture of a hippo and put “giraffe” in the image’s tag, guess how Google would see it? Weird looking giraffe…
So when a search engine indexes your site, it does so based on text alone. It does not care that you have an awesome picture of a waterfall; it only cares about the description of that photo, which it gets from the image alt tags. For that reason, you should use your site’s keywords in your image alt tags. If there’s a keyword that you want that page to rank in web searches, use that phrase in your image alt tags.
For example, the image alt tag for the image on the top of this post is:
“Image Alt Tags – Fish Blowing Bubbles”
The first part of that is for Google and other search engines, and the second is for those who are visually impaired and need a better description for the browser to read. The keyword on which I’ve based this post in my SEO plugin is “image alt tags”, so I’m absolutely sure to use it in my tag.
You’d be surprised how many times I’ve seen image alt tags that say simply “Logo” with nothing else descriptive, and adding image alt tags is particularly easy for those using WordPress. Those folks are missing out on so many opportunities! So get those descriptive image alt tags out there, and keep swimming along!