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Image Alt Text Checker

Check image alt text, missing alt attributes, duplicate alt text, long alt text, dimensions, and image SEO issues.

Paste HTML with image tags for alt analysis. URL inventory mode only lists image sources; a URL by itself does not contain HTML alt text.

Options

Checks missing alt attributes, empty alt text, duplicate alt text, long alt text, file-name-like alt text, dimensions, and loading attributes.

Output

Image alt text output will appear here.
HTML parsing runs in this page. The code does not send pasted markup to an image or accessibility analysis API.

Alt text depends on what the image means here

Alternative text is a replacement for an image's meaning or function in its current context. A product photo, chart, icon button, decorative divider, and repeated logo do not need the same kind of wording. Filling every alt attribute with descriptive keywords can make accessibility worse rather than better.

HTML mode identifies missing attributes, empty alternatives, repeated wording, filename-like text, and supporting markup such as dimensions and loading. It cannot decide from markup alone whether an image is truly decorative or whether the wording conveys the right meaning.

Empty alt can be the correct answer

Purely decorative or redundant images are commonly marked alt="" so assistive technology can ignore them. The surrounding context decides whether that empty value is appropriate.

Length is not a compliance limit

The selected length threshold is only an editorial prompt to review unusually long text. Neither HTML nor WCAG defines one universal maximum number of characters for alt text.

A better review sequence for image alternatives

  1. Paste the rendered or template HTML that contains the image elements.
  2. Start with missing alt attributes, then decide whether each image is informative, functional, decorative, redundant, or complex.
  3. For informative images, write the replacement meaning needed in that page context.
  4. For linked or button images, describe the action or destination rather than the pixels.
  5. For charts and diagrams, make the important data available in surrounding text or a longer description as well.

SEO checks and accessibility checks overlap, but they are not identical

Google recommends descriptive alt text as part of image SEO because it helps understand an image in context. Accessibility guidance is broader: the alternative must serve the equivalent purpose for people who cannot use the image visually. Keyword repetition is not a substitute for either goal.

Google's Image SEO guidance, the W3C WAI alt decision tree, and the HTML alt requirements cover different parts of that decision.

What markup inspection cannot know

Visible from HTML

Whether alt exists, whether it is empty, repeated wording, filename-like wording, dimensions, loading, title text, and source attributes.

Needs human context

Whether an image is decorative, whether a chart needs a longer text equivalent, whether nearby text already conveys the same information, and whether the alternative describes function rather than appearance.

Alt text decisions worth checking twice

Should every img have non-empty alt text?

No. Decorative images commonly use an empty alt value. Missing the alt attribute entirely is a different case and normally deserves review.

Can a filename be a good alternative?

Usually not. A filename rarely conveys the image's purpose or meaning for someone who cannot see it.

Can URL inventory mode judge alt text?

No. The alt attribute belongs to the HTML that embeds the image, not to the image URL itself. URL mode is therefore only a source inventory.