Summary
This is an article in a series of articles on digital accessibility posted on Global Accessibility Awareness Day (GAAD) 2026. Want to celebrate and participate? Share this article with others in your digital world.
Alternative text is one of the most universally recognized accessibility requirements, and one of the most consistently misapplied. Organizations invest in accessibility audits, update their guidelines, and train their teams, yet poor alt text remains endemic across the web. The reason is not negligence. It is a fundamental misunderstanding of what alt text is actually for.
It is not about description. It is about communication.
The Question Most Teams Never Ask
The instinct when writing alternative text is to describe what is in the image, the colors, the people, the objects. That instinct is understandable, but it is the wrong starting point. The right question is not what is this image? It is what job does this image do in this context?
The same photograph used in three different places may warrant three entirely different alt text treatments. A picture of a surgeon could be decorative background texture on a hospital homepage, a meaningful representation of a care team on a service page, or critical context in a news article. The image has not changed. Its communicative purpose has. Alternative text that ignores context does not just miss the mark, it actively degrades the experience for people using assistive technologies.
The Informative/Decorative Distinction Is Non-Negotiable
There is no more important concept in alt text than this one, and no concept more frequently fumbled.
Informative images carry meaning that is essential to understanding the content. They require alt text that accurately conveys that meaning, not a transcription of visual details, but a clear articulation of what the image contributes to the message.
Decorative images exist for aesthetic or layout purposes. They add nothing to the informational substance of the page. These should be explicitly marked so that assistive technologies can pass over them entirely.
Getting this wrong in either direction creates real harm. Describing a decorative image forces screen reader users to sit through irrelevant narration. Failing to describe an informative one leaves a gap in comprehension that sighted users never encounter. Neither outcome is acceptable in a truly accessible experience.
Brevity Is a Feature, Not a Compromise
Effective alt text is concise. Not because accessibility is a field that demands shortcuts, but because concision is the craft. Screen reader users are moving through content at speed. Every unnecessary word is friction. Every redundant phrase, “image of,” “photo showing,” “graphic depicting”, is noise that assistive technology already contextualizes for the user.
Write alt text the way a skilled editor writes a headline: say the essential thing, and stop.
This discipline also guards against a common trap, using alt text as a vehicle for keyword stuffing or marketing copy. Alt text written for algorithms rather than people is not accessibility. It is exploitation of an accessibility mechanism.
Complex Images Demand a More Sophisticated Alt Text Approach
Charts, graphs, infographics, and diagrams present a genuine challenge, and one that a single alt text field cannot fully address. A bar chart showing five years of market performance cannot be meaningfully conveyed in a sentence. Attempting to do so in the alt text attribute alone will either overwhelm the user or, worse, omit critical data.
The solution is not to try harder within the alt attribute. It is to reconsider where the explanation lives. A short, purposeful alt text identifies what the visual is and its main takeaway. A fuller explanation, the data, the trends, the methodology, belongs in the surrounding content, accessible to everyone, not hidden in an attribute that most users will never encounter.
This approach also improves the content itself. If a chart cannot be explained in prose, that is often a signal that the chart is doing more work than the content strategy intended.
Redundancy Is Not Thoroughness
A well-intentioned but damaging habit is restating in alt text what the surrounding copy already says. If a paragraph describes the outcome of a clinical trial and the adjacent image illustrates the same result, duplicating that content in the alt text does not reinforce the message, it forces screen reader users to hear the same information twice while sighted users encounter it once.
Effective alt text complements content. It fills gaps. It does not echo.
The Organizational Imperative
Alt text is not a technical problem to be solved once and forgotten. It is a content decision made dozens of times a day by writers, designers, marketers, and developers, many of whom have never been given a clear framework for making it well.
The teams that get this right are not the ones with the most detailed guidelines. They are the ones with the clearest decision-making tools, embedded directly into the workflows where content is created.
Put this into practice: Build an alt text decision tree your team can use at the point of content creation, not as an afterthought in a post-publish audit. Map the key questions: Is this image informative or decorative? What is its role in this specific context? Is this information already conveyed in nearby text? Does this image require supplementary explanation? A one-page visual guide placed where content decisions are made will do more for your accessibility outcomes than any retrospective remediation effort.