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AI can produce a useful first draft of image alt text, but it cannot reliably decide what an image means on your page. Better results come from editing the draft around the reader’s task: classify the image, keep only evidence visible in the pixels, preserve meaningful text, remove duplication, and provide a longer explanation for complex visuals. WCAG 2.2 Success Criterion 1.1.1 (published by the W3C on December 12, 2024) requires a text alternative that serves the equivalent purpose of applicable non-text content. In practice, that means a short, human-reviewed description—not an automatic inventory of everything an image appears to contain.
What makes an AI image description useful to a screen-reader user?
A useful description tells the reader what the image contributes to the page and what they can do with that information. The same photograph may need different wording in a news article, a product listing, a tutorial, or a button because its purpose changes with context.
The W3C’s WCAG 2.2 Success Criterion 1.1.1 describes the requirement as a text alternative that serves the equivalent purpose of the non-text content. That is a functional test, not a demand to transcribe every visible object. If the surrounding paragraph already explains a detail, repeating it in alt text adds listening time without adding access.
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Start by asking: “What must a person know or do after hearing this description?” Then make the first phrase answer that question. A product image might identify the model and its relevant state; a control image might name the action it performs; a decorative flourish might need an empty alternative.
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How do I classify an image before asking AI to describe it?
Choose the image’s role before editing words. W3C guidance distinguishes informative, functional, and decorative images; complex visuals need a short alternative plus a longer explanation in nearby text or a linked section.
| Image role | What the short alternative should do | Typical treatment |
|---|---|---|
| Informative | Convey the important subject, action, or state that supports the page’s message. | Write concise alt text focused on the information the reader needs. |
| Functional | Name the action or destination that occurs when the image is activated. | Describe the control’s function, such as “Open account settings,” rather than its visual appearance. |
| Decorative | Contribute no information or function. | Use a null alternative, alt='', so assistive technology skips it. |
| Complex | Identify the visual and state its main takeaway. | Pair concise alt text with a complete data, trend, process, or screen explanation in adjacent text or a linked section. |
Classification is contextual. A logo can be informative when it identifies the organization, functional when it links to the home page, or decorative when the organization’s name is already adjacent. A screenshot can be informative for a visual example but functional when it is the clickable control itself.
How do I improve an AI-generated description step by step?
Use AI for speed, then apply an editorial pass that checks purpose, evidence, and accessibility. The following workflow works whether the draft came from a built-in office feature, a content-management system, or another model.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors- Define the reader’s task. Write one sentence describing what the image contributes. For a product photo, decide whether color, model, condition, or orientation matters. For a button, identify the result of activating it. For a chart, identify the decision or conclusion the chart supports.
- Assign the image category. Mark it informative, functional, decorative, or complex. If it is decorative, stop writing a prose description and set a null alternative. If it is complex, plan a longer explanation outside the alt attribute.
- Draft a subject–action–context sentence. Name the principal subject first, then an action or relationship, followed by only the setting details that affect the task. “Red emergency-stop button beside a conveyor belt” is more useful than a catalogue of every object in the room when the page explains machine safety.
- Verify every claim against the pixels. Remove inferred identity, emotion, diagnosis, intention, relationship, location, or demographic information that the image does not establish. Treat small text, numbers, logos, and labels as uncertain until a person checks them.
- Preserve meaningful visible text. If wording inside the image is necessary and is not repeated nearby, transcribe it accurately. This includes text in a logo when the logo carries information. Do not silently “correct” a product name, warning, or quotation.
- Delete duplication and boilerplate. Do not begin with “Image of” or “Picture of”; screen readers already announce an image. Remove filenames, camera metadata, and details that the caption or adjacent paragraph already supplies.
- Choose the right length. Keep simple images short enough to hear comfortably. Microsoft’s accessibility style guidance gives 150 characters as a writing guideline, not a compliance limit or a measured comprehension threshold. When the meaning cannot fit, move detail into surrounding text instead of compressing it into an overloaded alt string.
- Review the result with the image and its context. Compare the final wording with the actual pixels, caption, heading, and nearby instructions. Ask a colleague or a screen-reader user to listen when the image is central to a task. Confirm that the page still makes sense if the image fails to load.
What wording patterns work for informative and functional images?
Lead with the information that changes the reader’s understanding or action. The examples below show the difference between an inventory-style draft and purpose-led wording.
| Context | Weak or risky draft | Purpose-led alternative |
|---|---|---|
| Product photo in an article about battery replacement | “Image of a phone on a table with a hand and several tools.” | “Phone opened to show the battery connector before removal.” |
| Link represented by an icon | “Blue arrow pointing right.” | “Continue to payment.” |
| Portrait used to identify a speaker | “Smiling young woman with brown hair.” | “Dr. Amina Patel, keynote speaker.” |
| Warning sign reproduced in a safety guide | “Yellow triangle with an exclamation mark.” | “Warning: high voltage.” |
| Decorative divider | “Gray geometric pattern.” | Use alt='' and keep it out of the reading order. |
Do not copy these sentences blindly. Replace the subject and action with facts established by the particular image and page. A person’s apparent age, mood, health, or identity is not automatically evidence; include such information only when it is explicitly supplied and relevant to the task.
What should alt text say for a chart, diagram, map, or screenshot?
A complex visual needs two layers: a concise alternative that identifies the visual and its main point, and a longer explanation that carries the details a short string cannot. The longer explanation can be a paragraph immediately before or after the image, an expandable details region, a data table, or a linked section.
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Charts
State the chart type, subject, time period or categories, and the principal trend or comparison. Then provide exact values, units, and exceptions in nearby text or a table. Do not claim a precise increase, ranking, or causal explanation unless the labels and data support it.
Example short alternative: “Line chart showing monthly support requests declining from January through April, with a brief spike in March.” The adjacent description should list the months and values, identify the axis units, and explain any outlier that matters to the decision.
Diagrams and processes
Identify the system or process and its key relationship. A flow diagram’s short alternative might say, “Three-step account recovery flow from identity check to password reset.” The longer text should name each step, decision branch, and destination in order.
Screenshots
Describe the task-relevant state rather than every control on the screen. Include the page or application name, the control being demonstrated, visible status or error text, and the sequence the reader must follow. If the screenshot contains instructions that are not repeated in prose, transcribe them accurately.
Maps and spatial visuals
Give the geographic scope and the relationship the reader needs, such as a route, boundary, or highlighted location. Provide place names, directions, distances, or a list of stops in text; a string such as “map of the region” is not an equivalent alternative when the route itself is the point.
How long should AI-generated alt text be?
Use the shortest wording that preserves the image’s purpose, not a fixed character count. Microsoft’s 150-character guidance is a style heuristic for concise descriptions; it is not a universal WCAG threshold and does not make a complex chart accessible by itself.
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- Simple informative image: one focused sentence or phrase is usually enough.
- Functional image: name the action or destination; visual adjectives rarely help.
- Decorative image: use an empty alternative rather than a descriptive sentence.
- Complex image: keep the alt text brief and put data, sequence, or interpretation in adjacent content.
Read the description aloud in context. If the listener must hold several clauses in memory to understand the page, move supporting detail into the surrounding prose or a linked long description.
How should I handle text, logos, and uncertain numbers inside an image?
Text embedded in an image is part of the image’s information. Section508.gov guidance recommends repeating necessary text word for word when it is not available elsewhere. Verify capitalization, punctuation, symbols, and numbers manually; OCR and vision models commonly misread small or stylized lettering.
Decide whether a logo is serving as a label, a link, or decoration. If the organization name appears in adjacent text, the logo may need an empty alternative. If the logo is the only label for a link, the alternative should name the destination or organization, not describe its colors and shapes.
When a character or number cannot be confirmed, do not guess. Replace it with a neutral description, inspect a higher-resolution source, or provide a human-verified transcription in nearby text.
Should I trust AI-generated image descriptions?
No. Treat AI output as a draft that requires human approval. Microsoft warns that generated descriptions may be inaccurate, incomplete, overly general, or imprecise, and Section508.gov cautions that default or AI-generated text often fails to communicate an image’s actual purpose.
Models may confidently invent a location, read the wrong number, infer a person’s emotion, or describe an object that is not relevant to the page. A reviewer who knows the page’s audience can catch both visual errors and contextual errors that a model cannot see.
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Claims that require special restraint
Do not use an image-description feature to make decisions about emotion, sensitive attributes, health, legal matters, finances, employment, surveillance, or profiling. Microsoft’s feature guidance explicitly places these uses out of scope. Describe observable, task-relevant content instead, and obtain authoritative information through an appropriate process when a decision depends on it.
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A practical review checks the image, the page, and the listening experience together. You do not need to turn every review into a formal audit, but you should test the images that carry instructions, data, identity, or navigation.
- Open the page with the target screen reader and move through the content in its normal reading order.
- Listen to the image announcement and the alternative text without looking at the screen.
- Ask whether the description supplies the same task-relevant information a sighted reader gets from the image and nearby copy.
- Check that the image is not announced twice because a caption or adjacent sentence repeats the same information unnecessarily.
- Disable images or simulate a failed image request. The remaining text should still explain the task, result, or decision.
- For a control, activate it using the keyboard and confirm that the announced name matches the action or destination.
- For a chart, diagram, or screenshot, locate and read the longer explanation, then verify that its order and labels make sense without the visual.
Invite people who routinely use assistive technology to test high-impact content when possible. Their feedback can reveal confusing order, excessive verbosity, or a missing relationship that a visual inspection overlooks.
How do local and cloud AI description features affect privacy?
Microsoft documents two modes for its AI-generated alt-text feature. On Copilot+ PCs, generation can run locally; on other devices, a person can explicitly request generation through a cloud model. Microsoft says the documented feature behavior does not retain image data or use it to train future models, while also labeling descriptions as potentially inaccurate.
Check the current settings and product documentation before deployment because software behavior can change. Do not upload confidential, personal, medical, financial, or proprietary images to a service unless your organization’s privacy, security, and consent requirements allow that processing. Local generation can reduce transfer risk, but it does not remove the need for human review or data-governance controls.
How can I compare two candidate descriptions?
When editors disagree, evaluate both drafts against the same questions instead of choosing the one with more detail. A simple review matrix makes the decision auditable.
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| Criterion | Question to ask | Warning sign |
|---|---|---|
| Purpose and user task | Does the wording convey what this image contributes on this page? | It describes appearance but not the action, finding, or identity the reader needs. |
| Accuracy | Can every object, word, relationship, and number be confirmed from the image or authoritative context? | It guesses a name, place, emotion, statistic, or intention. |
| Priority and brevity | Does it lead with the most important information without repeating nearby text? | It starts with boilerplate or lists incidental details before the point. |
| Uncertainty and sensitivity | Does it avoid unsupported identity, health, demographic, or intent claims? | It presents an inference as a fact or labels a person by a sensitive attribute. |
| Completeness for complex visuals | Is a longer explanation available when the short alternative cannot carry the meaning? | It calls a chart or screenshot “complex” but supplies no data, sequence, or takeaway. |
What common AI alt-text mistakes should I fix?
- Generic openings: Remove “image of,” “photo of,” and similar announcements that a screen reader already provides.
- Filename leakage: Replace camera or CMS filenames with a meaningful alternative.
- Visual inventory: Delete furniture, colors, background objects, and camera details that do not affect the reader’s task.
- Unsupported inference: Remove guessed identities, feelings, diagnoses, relationships, locations, and intentions.
- Wrong control name: For icon links and buttons, describe the result of activation rather than the icon’s shape.
- Missing visible wording: Add verified text from signs, labels, warnings, or logos when the page does not provide it elsewhere.
- Overloaded complex alt text: Keep the alternative concise and move data or procedural detail into adjacent content.
- Duplicate narration: Coordinate alt text with captions, headings, and body copy so the same sentence is not read twice.
- Decorative content announced: Set a null alternative for images that add no information or function.
What does correct HTML look like?
Use the markup pattern that matches the image’s role. The examples below are templates; replace the wording with facts verified for your image.
<img src='battery-step.jpg' alt='Phone opened to show the battery connector before removal.'>
<a href='/account/settings'>
<img src='settings-icon.svg' alt='Open account settings'>
</a>
<img src='decorative-divider.svg' alt=''>
<figure>
<img src='support-trend.png' alt='Line chart showing support requests declining from January through April, with a brief spike in March.'>
<figcaption>Monthly requests: January 420, February 390, March 455, April 310. Values are counts of submitted tickets.</figcaption>
</figure>The chart example uses the alternative to announce the visual and its takeaway, while the caption supplies the values. If the caption is not sufficient for a process or screenshot, provide a longer description in normal page content or a linked details section.
What should an editorial team check before publishing?
Make the review repeatable by adding a short checklist to your content workflow:
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- Confirm that the first phrase gives the reader the information or action that matters.
- Verify names, labels, numbers, symbols, and relationships against the image.
- Remove guesses about identity, emotion, health, intent, or other sensitive attributes.
- Check for duplication with captions, headings, and nearby paragraphs.
- Use
alt=''for genuinely decorative images. - Supply a complete adjacent explanation for charts, diagrams, maps, and screenshots whose meaning exceeds a short alternative.
- Listen to important images with the target screen reader and test keyboard activation for image controls.
- Record who approved the wording and update it when the image, data, interface, or surrounding text changes.
This process keeps AI in the role it handles well—producing a fast starting point—while assigning meaning, verification, and accountability to the people responsible for the page.
Frequently Asked Questions
Can a decorative image be left without an alt attribute?
Do not omit the attribute. An explicit empty value, alt='', tells assistive technology that the image is intentionally decorative; an omitted attribute may cause the file name or other fallback text to be announced.
How should alt text be maintained when an image changes?
Treat the alternative as content that must be versioned with the image and its surrounding copy. When a chart’s data, a product’s state, or a screenshot’s interface changes, trigger a fresh human review rather than assuming the old wording still applies.
What is the best way to handle AI descriptions on multilingual pages?
Translate the verified meaning, not the model’s raw draft, and have a fluent reviewer check names, terminology, punctuation, and cultural context. A literal machine translation can introduce a different claim even when the source description was accurate.
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Who should approve an AI-generated description in a regulated workflow?
Assign approval to a person who understands both the image’s subject and the page’s audience, with accessibility ownership clearly documented. For legal, medical, financial, employment, or surveillance-related content, involve the relevant subject-matter and compliance reviewers instead of relying on a vision model.
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