Gemini alt text generator

Asked directly in an open chat, Gemini frequently returns alt text phrased generically, "an image related to the topic", technically accurate about the subject area while describing nothing specific about the image itself. This tool takes the same short description and returns specific, function-focused alt text from the start.

It is worth stating plainly that this tool does not process an uploaded image. This site has no image-analysis pipeline; generation works entirely from the description supplied. That generation happens server-side: the description is sent to our AI server and returned as alt text. The allowance is 5 free runs per rolling 24-hour window, no account required, no tier above it.

Alt text is the written alternative to an image: a screen reader announces it in place of the picture, and a browser shows it as fallback if the image fails to load. The standard it's held to is whether it serves a listener who cannot see the image, which requires specificity, not merely a description broad enough to be technically accurate.

That distinction has concrete implications. Function outranks appearance, decorative images carry an empty alt attribute, and charts need their actual data points stated directly. A description that could apply equally to dozens of similar images fails the accessibility purpose even when nothing in it is technically wrong.

Three steps, with specificity built in rather than corrected after the fact.

Step 1

Describe the image: what it shows specifically, and what function it performs on the page.

Step 2

Run it. The description is sent to our AI server and returns as concise, specific alt text within seconds.

Step 3

Read the result as a screen reader would announce it inline, confirm it names something specific, and apply it.

Alt text phrased broadly enough to apply to any similar image, "a photo related to home cooking" on a photograph of a specific dish, technically fills the attribute while failing the purpose it exists for: telling a listener what is actually in front of them.

The same failure recurs with data visuals, describing a chart only by its type rather than its content, and with decorative images left with a full description instead of an empty attribute, each forcing a screen reader to spend a listener's attention on something that doesn't earn it.

Left to its defaults in an open chat, Gemini converges on a narrow, recognizable set of habits that favor breadth over specificity.

"Related to" constructions

Phrasing that establishes a subject area without describing the specific content of the image.

Clipped, under-specified output

Alt text short enough to read as already truncated, omitting context a fuller description would supply.

Generic filler for data visuals

Naming a chart's type without its actual values or trend.

Not automatically, and no honest tool claims that it does. Alt text generated from a specific, accurate description can genuinely satisfy the intent behind accessibility guidelines like WCAG. Alt text generated from a vague description, or published without review, frequently does not, regardless of how technically accurate its broad phrasing was.

Output quality is bounded by input quality. A precise, function-focused description yields alt text worth publishing with minor review. A vague one yields generic filler that occupies the attribute without serving the person hearing it. Review is not optional if accessibility is the actual goal.

Content and marketing teams who already draft in Gemini tend to reach for this once they notice how consistently the chat window's alt text answer reads as generic subject-matter description rather than a specific account of the image. Publishing at volume, batches of blog or product images, makes that manual correction expensive enough to be worth removing.

Developers running an accessibility audit use it to work through images an automated scan has flagged as missing alt text, and ecommerce teams use it to establish distinct, specific alt text across large product catalogs that would otherwise blur together under generic descriptions.