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Image SEO and alt text: what Google uses to understand a picture

Google reads alt text, file names and the words around an image. Alt text also serves people using screen readers.

Author: HD4 min read

Table of contents
  1. Key takeaways
  2. What Google reads
  3. Write it well
  4. Fill the gaps
  5. See it on your own site
  6. Sources

What Google reads#

Google's image guidance names descriptive file names, titles and alt text, and says alt text is the most important attribute for image metadata. It also improves accessibility for people who cannot see images.

Write it well#

  • Say what the image shows, in a short sentence.
  • Leave alt empty only for pure decoration.
  • Put the image near the text it illustrates.

Fill the gaps#

The audit finds images with no description and drafts one for each, for search and for screen readers.

See it on your own site#

The free website check reads a site you name and reports what holds its pages back, with no account and no card. It changes nothing on your site.

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Sources#