Technical Term
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Alt text
AccessibilityAlt text explains what an image contributes when it cannot be seen or when assistive technology interprets it. It prevents a useful image from becoming lost information.
What means Alt text
Alt text: Alt text refers to alternative text associated with an image. It explains the image function or meaning when the image does not load, cannot be seen or is read by screen readers, search engines and analysis systems.
AISEO Area: Accessibility. This tag helps to place the term within the glossary and understand if it belongs to crawling, semantics, performance, security, AI, accessibility or certification.
It matters because many images contain information that appears nowhere else. Good alt text improves accessibility, adds context and prevents a relevant image from becoming silent for users and machines.
- Describe the real function of the image in a natural sentence.
- Use an empty alt attribute for purely decorative images.
- Avoid keyword lists or generic text such as “image”.
- Make sure charts, products or important steps have a clear alternative.
Common errors
Using the same alt text on different images.
Filling alt text with keywords without describing anything.
Leaving images that explain important information without an alternative.
Writing texts so long that they poorly replace the visible content.
Frequently asked questions about Alt text
What is Alt text?
Alt text refers to alternative text associated with an image. It explains the image function or meaning when the image does not load, cannot be seen or is read by screen readers, search engines and analysis systems.
Why should Alt text be reviewed?
It matters because many images contain information that appears nowhere else. Good alt text improves accessibility, adds context and prevents a relevant image from becoming silent for users and machines.
How is Alt text handled in AISEO?
Describe the real function of the image in a natural sentence. Use an empty alt attribute for purely decorative images. Avoid keyword lists or generic text such as “image”.