Part 7 of our 7 on-page SEO fundamentals course.

What is an alt tag?

An alt tag, also known as alternative tag, is used to describe an image in a short sentence. A picture is worth a thousand words, but not for Google spiders. Since pictures don’t have any meaning for search engines, an alt text and content text are equally important.

Technical rules for alt tags?

  1. Should describe the image in a short sentence
  2. Alt attributes should always include the keyword
  3. An ideal html alt tag text should be around 7 to 8 words, but not more than 16 words
  4. Avoid keyword stuffing (that’s a nice way of saying: do not, ever, ever, stuff keywords in your alt tag)
  5. Don’t forget to include your content summary while you are describing the image

Example of good alt tags

For a text with main keyword: Tennis
 
Alt: A man playing tennis in the summer
 
Example of alt tag
 
For a text with main keyword: cheesecake
 
Alt: A slice of cheesecake covered in chocolate
 
Example of alt tag with cheesecake

Resources

To learn more about the alt tag you can check the links below. Learn how to optimize your alt tags Best ways to optimize alt text 6 Tip how to write killer alt tags

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