The practical answer
Write useful image alternative text by considering the image’s purpose, nearby content and accessibility rather than repeating service keywords. Use this guide to choose a manageable first change, check the evidence behind it and connect the work to the customer journey. The examples are illustrative planning exercises, not reports of client results.
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Decide what the image contributes
Before writing alternative text, ask whether the image communicates information, performs an action or is only decorative. A diagram explaining a process has a different purpose from a background photograph beside a complete text explanation. Do not force a description onto every visual simply because an audit tool expects one. The alternative should help someone understand the content or function that would otherwise be unavailable, without creating unnecessary repetition.
Describe meaningful content accurately
For an informative image, describe the relevant subject and context in ordinary language. Do not claim that a stock photograph depicts your staff, office or client work unless that is true. Avoid adding a locality, service phrase or business name when the image does not communicate it. A concise, accurate description is more useful than a promotional sentence. If the visual contains important text, ensure that information is also available in an accessible form.
Handle linked images by their function
When an image is the only content inside a link, its accessible name should explain the destination or action. If a nearby text link already provides that name and the image is decorative within the same link, avoid a redundant description. Check the actual markup rather than judging only the visual layout. An article-card photograph and title can otherwise create repetitive announcements for assistive-technology users as they move through a grid.
Explain complex graphics in the page content
A chart, process diagram or detailed screenshot may need more explanation than a short alt attribute can provide. Introduce the key point in the surrounding text and include a fuller description or data table where appropriate. The alternative can identify the visual and its purpose. Do not hide essential instructions only inside an image. Search-friendly presentation starts with a complete, readable explanation that does not depend on seeing every pixel.
Check asset quality alongside text alternatives
Use suitable dimensions, responsive sources and efficient formats where supported. Preserve width and height information so the layout can reserve space. A descriptive filename can help maintenance, but it should not become a long keyword list. Review whether the image is necessary at all, especially when it adds weight without adding meaning. Alternative text addresses one part of accessibility; it does not fix unreadable text, poor contrast or a broken page structure.
A focused implementation example
Imagine a blog card using a stock photograph of a laptop beside an article title. The photo should not be labelled as a successful client campaign or a company office. A simple truthful description may be appropriate, or an empty alternative if the image is decorative and the linked title already supplies the useful name. The decision depends on the complete card markup, not on a rule that every image needs the target keyword.
Measure the change before expanding it
Check the rendered HTML and use an accessibility review to see how images and linked cards are announced. Confirm that informative visuals have equivalent explanations and decorative ones do not add noise. Test responsive loading and layout stability separately. Do not report alt-text completion as a guarantee of search visibility; the meaningful result is that the visual’s content or purpose remains understandable to more readers.
Decide whether the image carries information or decoration
Ask what the reader would miss if the image were unavailable. A conceptual background may contribute atmosphere without adding facts; a process graphic may communicate a sequence that needs a text equivalent. This decision should happen before writing alternative text. The same visual can have different roles in different contexts.
Do not turn every decorative image into a keyword opportunity. Unnecessary descriptions can make the page harder to use with assistive technology. Where an image genuinely explains something, describe that contribution clearly and keep important information available in the surrounding text as well.
Describe the visible meaning without inventing a story
Alternative text should not claim that an illustration depicts the company’s real team, client or office unless that is true. An AI-generated scene of professionals discussing a dashboard is a conceptual image, not evidence of a completed project. Describe the relevant visual honestly and avoid adding identity details that are not known.
Use concise wording that fits the purpose. A service-page illustration may need only its subject; a complex chart needs a fuller explanation outside the alt attribute. Do not infer a person’s exact role or a business result from a generic picture. Accuracy matters as much in image descriptions as in the main copy.
Handle linked images through the destination’s function
When an image is the only content of a link, its accessible name should make the action understandable. An article thumbnail should identify the article or task the link opens rather than merely describe an attractive desk. Review the image together with nearby linked text so the combined result is not needlessly repetitive.
If an image and heading form one clearly labelled card link, the implementation may be able to avoid duplicate announcements. Check the actual markup and interaction rather than apply the same text to every image automatically. Functional alternatives depend on how the image is used, not just on what the file contains.
Keep complex explanations in readable page content
A diagram of a workflow or comparison can be useful, but important steps and conditions should also be explained in text. Do not place the entire answer only inside a graphic. Readers may need to enlarge it, translate it or access the information without seeing the image.
Use a caption where it clarifies whether a visual is illustrative or based on actual data. If data is shown, provide its meaning and source appropriately. A long alt attribute is rarely a comfortable substitute for a proper explanation. Let the page carry the reasoning and use the image to support comprehension.
Review alternative text with asset quality
Check file dimensions, compression, responsive variants and cropping alongside the wording. A suitable description does not fix an image that is too heavy or unintelligible on mobile. Ensure the meaningful part remains visible at the placements where the image is actually displayed.
Keep an asset record when the website contains many distinct article visuals. Include the intended subject, use and alternative text. This helps editors avoid accidental reuse and misleading descriptions. Review changes after replacing an image, because the old alt text may no longer describe the new scene even when the filename remains the same.
Your action checklist
- Classify each image as informative, functional or decorative.
- Describe only what the visual truthfully communicates.
- Check the accessible name of image links.
- Provide longer explanations for complex graphics.
- Review dimensions, responsive sources and asset weight.
Common questions
Is empty alt text always an SEO mistake?
No. An empty alt attribute is appropriate for a genuinely decorative image when no information or function is lost. The decision should follow the image’s role in context, not an arbitrary requirement to insert keywords.
How should this work be prioritised?
Prioritise a real obstacle for a valuable audience over a cosmetic change made only for a search score. Record the starting condition, the proposed correction and the person responsible. Review the affected page and enquiry journey after implementation. Search visibility and customer behaviour have several causes, so do not attribute every change to one edit or promise a particular ranking.
Further reading
Continue exploring on-page seo
Make individual pages easier to understand through clear titles, headings, content and relevant links.
- On-page SEO checklist for service pages that help customers decide
- Write Service Page Titles and Meta Descriptions That Match the Offer
- Heading Structure for Clear, Search-Friendly Service Pages
- Write Service Page FAQs That Answer Real Buying Questions
- Service Scope Content: Explain Inclusions, Exclusions and Options
- In-Page Navigation for Long Articles: Help Readers Find the Answer
Put the next step into practice
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Prepared by SEOptimizer editorial. Examples are illustrative; outcomes depend on the business, market and implementation. AI-generated editorial imagery illustrates the subject and does not depict actual customers, employees or client results.
