Does alt text actually help ranking or only accessibility?
- Published November 6, 2026
- Linked from 2 answers
- In a cluster of 63
Both, but for different results. For the page itself, alt text is a small piece of context among everything else on the page. For the image, it matters a great deal: Google’s image SEO guidance calls it “The most important attribute when it comes to providing more metadata for an image”, and says Google reads it, together with what it can see in the image and the content of the page, to work out what the image shows. So alt text is how an image earns a place in Google Images, and it is first of all how a screen reader user learns what the image is.
What alt text does, by result
| Where | What alt text contributes |
|---|---|
| Screen readers and failed image loads | The description of the image; without it, the image is missing for those users |
| Google Images | A main source of what the image depicts, used alongside the page content and the image itself |
| Web results for the page | A small amount of context about the page's content |
| An image used as a link | The anchor text of that link, which Google uses as it would any anchor |
The last row is easy to miss. A logo or button image that links to another page, with no alt text, is a link with no anchor text.
Writing it
Google’s guidance asks for alt text that is useful and information-rich, uses keywords appropriately, and fits the content of the page. In practice:
- Describe what the image shows, in the words you would use to tell someone who cannot see it.
- Include the specific detail that makes the image relevant to the page: the model, the step, the place.
- Keep keywords where they describe the image, and do not list them.
- Leave decorative images, such as dividers and background shapes, with empty alt text so screen readers skip them.
“Dalmatian puppy playing fetch”, the example Google’s guidance uses, tells both a screen reader user and Google what the photo shows. “Dog puppy dog breeds puppies for sale” tells neither.
Where alt text will not help
Alt text does not make a page rank for a search the page does not answer, and stuffing it with keywords turns an accessibility feature into keyword stuffing. When images show up in image results but the page gains nothing in web results, the reason lies in how the two kinds of result work, covered in why images rank in image search but not help the page. Write alt text for the person who cannot see the image, and the search value follows from the description.
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