2 Geeks Web Design
Why Alt Text Matters and How to Write It Effectively
Every photograph, illustration, and infographic on a website carries a story beyond its visual surface. For the millions of Australians who rely on screen readers, that story is only accessible when images are paired with thoughtful descriptive text. Alt text, short for alternative text, is the small but mighty HTML attribute that translates visuals into words.
Small businesses across Sydney, Melbourne, Brisbane, and regional towns are recognising that accessible design is no longer optional. From local cafés uploading menu photos to tradies showcasing completed renovations in Perth, the images a business publishes shape how customers perceive the brand. When those visuals are invisible to assistive technology, a meaningful slice of the audience is shut out before a single word of the website is read.
Crafting strong alt text is one of the highest-leverage skills a content creator can develop. It sharpens awareness of visual hierarchy, improves search visibility, and signals professionalism to both human visitors and automated crawlers. The following sections explore why this single line of code carries so much weight and how to get it right on every page.
Understanding what alt text is for
Alt text lives inside the alt attribute of an img tag and serves as a textual replacement for an image. When a screen reader encounters an image, it announces either the alt text or, if that attribute is empty, the file name. Originally designed to display when images failed to load, the attribute still performs that fallback role in modern browsers, but its primary purpose today is accessibility.
The attribute is distinct from captions, which appear beneath images as visible explanations, and from title text, which appears on hover. Captions help sighted readers understand context, while alt text helps non-sighted readers understand content. Treating alt text as a caption often produces verbose descriptions that miss the point, which is to convey the information the image actually contributes to the page.
Consider a photo of a barista pouring latte art in a Melbourne laneway café. A useful alt text might read "Barista pouring rosetta latte art into a ceramic cup at a Melbourne café." The description identifies the subject, the action, and the location-relevant detail without unnecessary embellishment. Compare this to "Coffee shop photo", which conveys almost nothing, and to "Wow look at this amazing coffee art by Sarah who trained in Italy", which buries the relevant detail in biography.
The Australian legal and ethical landscape
Australia's Disability Discrimination Act 1992 has long required businesses to make reasonable adjustments so that people with disability can access their goods and services. The Australian Human Rights Commission continues to receive complaints about inaccessible websites, and the Office of the eSafety Commissioner publishes guidance that references the Web Content Accessibility Guidelines.
For businesses operating under the National Disability Insurance Scheme or partnering with government clients that must comply with the Digital Service Standard, accessible images are a baseline expectation rather than a nice-to-have. ACMA's reporting on digital literacy highlights a growing population of older Australians and people with print disabilities who depend on assistive technology to engage with online services.
Beyond legal compliance, ethical practice in the Australian context means recognising that one in six Australians lives with some form of disability. A boutique florist in Adelaide uploading images of wedding arrangements or a Sydney-based real estate agent posting property galleries both serve communities where accessibility is a daily consideration, not an edge case. Accessible design reflects respect for that diversity and strengthens brand trust. For a broader look at how these principles connect to everyday business decisions, the what every small business owner should know about web accessibility guide covers the essentials.
How alt text shapes search performance
Search engines cannot view images the way humans do. They rely heavily on alt text, file names, and surrounding copy to understand what an image depicts. A photograph of a handcrafted leather wallet uploaded as IMG_4521.jpg with no description sends very weak signals to Google Image Search, Bing Visual Search, or the AI-driven results increasingly appearing in Australian search results.
Writing alt text that includes relevant terms naturally boosts the chance of ranking in image results. A small furniture maker in Hobart describing a product photo as "Hand-turned Tasmanian blackwood side table with dovetail joinery" introduces specific, descriptive vocabulary that aligns with how shoppers search. Generic phrases such as "image of furniture" or "product photo" add nothing to ranking potential.
Image search also fuels discovery on platforms like Pinterest, Instagram, and Google Shopping, all of which Australian small businesses use to reach customers. When alt text describes the image accurately, those platforms can categorise and recommend content more effectively. Accessibility and search visibility reinforce each other rather than competing for attention.
Mistakes that quietly break accessibility
Several recurring errors undermine alt text even when business owners have made the effort to include it. One of the most common is keyword stuffing, where alt text reads like "best plumber Brisbane cheap plumber Brisbane emergency plumber Brisbane 24 hour plumber". Screen readers will dutifully announce every word, making the experience unpleasant and earning no ranking benefit.
Another frequent issue is redundant alt text. Many content management systems automatically populate alt attributes with image captions or surrounding paragraph text, producing duplicates that slow down screen reader output. A third pitfall is using alt text for purely decorative imagery, such as a background pattern or a small dividing line. WCAG recommends leaving the attribute empty so assistive technology skips these elements entirely.
A fourth mistake involves complex images such as charts, infographics, or screenshots of spreadsheets. A short alt text cannot convey the data these visuals communicate, so a longer description needs to live elsewhere on the page. Australian organisations publishing research summaries, such as universities releasing policy briefs, often need to think carefully about how to present data visually without losing meaning for non-sighted readers.
Writing alt text for different image types
Different categories of images call for different descriptive strategies. The comparison below pairs common image types with effective and ineffective alt text examples.
| Image type | Weak alt text | Strong alt text |
|---|---|---|
| Product photograph | "Shoe" | "Brown leather lace-up ankle boot on a wooden floor" |
| Team portrait | "Our team" | "Four staff members standing behind the counter of a Brisbane bakery" |
| Infographic | "Stats graph" | "Bar chart showing Australian rental prices rising 12 percent from 2020 to 2024" |
| Decorative divider | "Divider line" | Leave alt attribute empty so screen readers skip it |
| Screenshot of a form | "Form" | "Contact form with fields for name, email, and enquiry message" |
| Event photograph | "Event" | "Crowd watching fireworks over Sydney Harbour on New Year's Eve" |
The pattern across the strong examples is specificity grounded in observable detail. Names of people, when known, can be included, though consent matters in workplace photography. Locations, colours, actions, and the emotional tone of a scene all help construct a vivid mental picture.
For logos, the convention is to use the company name. For icons used as functional buttons, such as a magnifying glass that opens search, the alt text should describe the action rather than the symbol. A labelled icon could have an empty alt attribute since the surrounding text already explains it.
Testing, tools, and lasting habits
Writing alt text is only the starting point. Validating it requires checking pages with a screen reader such as NVDA on Windows or VoiceOver on macOS and iOS, both of which are commonly used across Australia. Listening to a page from top to bottom reveals whether alt text is missing, redundant, or poorly matched to surrounding content.
Browser extensions like WAVE, axe DevTools, and Lighthouse flag accessibility issues including missing or empty alt attributes. Manual review remains important, however, because automated tools cannot judge whether alt text is descriptively accurate. A photo of a beach might pass an automated check while still conveying nothing meaningful in its description.
Building a habit of writing alt text at the point of image upload keeps the workflow efficient. Content guidelines, image libraries with naming conventions, and brief team training all reinforce the practice. For businesses working with agencies, specifying alt text expectations in briefs ensures accessibility does not fall through the cracks during revisions.
Habits that sharpen every alt text entry
- Describe the image as if explaining it to someone who cannot see it, focusing on what the image contributes to the page's message.
- Keep alt text concise, generally under 125 characters, unless the image requires a longer description placed elsewhere.
- Use the image's surrounding context to decide what to include, since a chart in a financial report needs different detail from a chart in a lifestyle blog.
- Avoid phrases such as "image of" or "photo of", which add no information and slow screen reader output.
- Leave the alt attribute empty for purely decorative graphics so assistive technology skips them entirely.
- Reuse a description only when the same image appears with identical purpose on multiple pages, otherwise rewrite it to suit the new context.
- Review alt text periodically during site audits, especially after redesigns, template changes, or content migrations.
Following these practices consistently turns alt text from a compliance checkbox into a quiet but powerful asset. It signals care to every visitor, strengthens visibility in search engines, and aligns a small business with the inclusive standards Australians increasingly expect from the brands they support. When accessibility is treated as part of the craft of web design, the resulting site serves its audience more completely, and the small effort of writing a few descriptive words pays dividends far beyond the lines of code they occupy.