Alt Text

Alt text, or alternative text, refers to the written description that can be applied to images on the web to describe what the image shows. Alt text plays an important role in SEO and accessibility.

Key facts about alt text:

  • Helps search engines understand what an image contains to better index and rank it in image search results.
  • Provides a text description of the image for visually impaired users who may use screen readers.
  • Should provide a short, accurate summary of the image content – not be generic like “photo” or overly keyword-stuffed.
  • Is read aloud by screen readers to describe images so should make sense out of context.
  • Is displayed in place of the image if it fails to load on the page.
  • Can be used by search engines if the image file itself lacks proper metadata or descriptors.
  • Should be added to all images – not just those that directly relate to content. Decorative images can have blank alt text.
  • Max recommended length is 125 characters. Avoid over-optimization with lengthy alts.
  • Having unique, descriptive alt text for each image improves SEO value.

In summary, alt text provides vital descriptive information for key images to enhance accessibility, experience, and search visibility. It’s considered foundational SEO best practice.