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Alt text is the minimum. AI image description can provide richer, context-aware descriptions for screen readers — but only if you understand how blind users actually consume image content.
You add alt="dog" to a photo of your golden retriever puppy sleeping on a sunny porch and call it accessible. A screen reader user hears "dog." That is technically WCAG compliant. It is also useless — it communicates nothing about the image that matters. Is the dog cute? Is it relevant to the article? Is the sunny porch the point of the photo, or is the dog?
Our AI image description tool generates detailed, context-aware descriptions. But good accessibility is not just about generating more words — it is about generating the right words for how screen reader users actually consume content. Here is what that means in practice.
Screen reader users do not listen to a page linearly from top to bottom. They navigate by headings (H1-H6), links, and landmarks. Images are announced as "graphic" followed by the alt text. If the alt text is "dog," they hear "graphic: dog" and move on. If the alt text is 200 words long, they hear a 200-word description that interrupts their flow.
The rule of thumb: alt text should be as long as necessary and as short as possible. For a decorative image that adds no information, empty alt text (alt="") is correct — the screen reader skips it entirely. For an informative image, the description should convey what the image adds to the content, not just what is in it.
Consider a photo of a person using a laptop at a coffee shop:
Same photo, three different appropriate descriptions. AI image description tools generate a generic description — they do not know the context of your article. That is your job: take the AI-generated description and edit it to fit the context in which the image appears.
Alt text (alt attribute): 125 characters max. Screen readers cut off after this point. This is for the essential information the image conveys. Think of it as the "elevator pitch" for the image.
Long description (longdesc or aria-describedby): for complex images — charts, infographics, maps, diagrams — where 125 characters cannot convey the full information. This is a separate text element linked to the image. Screen reader users can choose to access it if they need the detail. Use this for data visualizations, floor plans, medical images, and any image where the details matter.
Visible captions (figcaption): displayed below the image for all users. This is where you add context that benefits everyone — not just screen reader users. "Figure 1: The coffee shop layout showing three distinct work zones" helps sighted users too.
Our AI image description tool generates the raw description. From that, you can extract the alt text (first 125 characters), the long description (full AI output, edited for context), and the caption (key takeaway in one sentence).
Common accessibility mistake: using the file name as alt text. alt="IMG_4827.jpg" is worse than empty alt text — it actively wastes the screen reader user's time. Either describe the image or mark it as decorative. Never leave the file name.
For generating images that need describing, our AI image generator creates custom visuals. And for a deeper dive into image description technology, see our image description guide for e-commerce product alt text.
AI Image Describer
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