What is an Alt Text ?
Alt text is the written description attached to an image in HTML code. It tells search engines and screen readers what the image contains. It shows up when an image fails to load, gets read aloud by assistive technology, and acts as the main signal Google uses to understand and index image content. Every image that carries information, like product photos, charts, diagrams, or infographics, needs alt text. Decorative elements like background patterns or spacer graphics do not.
Why does alt text matter for SEO?
Alt text matters because Google uses it as the primary signal to determine the subject of an image and decide whether to surface it in image search results. A page about "Wix SEO services" that includes a process diagram with alt text reading "Wix SEO audit workflow showing technical analysis, on-page optimization, and reporting stages" reinforces the page's topical relevance in a way the image alone cannot. The same page with missing or generic alt text leaves that reinforcement on the table.
The consequences of neglecting alt text are consistent across audits. Product pages display dozens of images with filenames like IMG_4523.jpg and empty alt attributes, missing every product-specific search query in Google Images. Blog posts include screenshots and infographics that strengthen the written argument for sighted users but contribute zero context to search engines. Service pages use team photos and office imagery with no descriptions, wasting opportunities to associate the brand with location and industry terms.
The inverse is equally measurable. A business that audits its image library, writes descriptive alt text for every informational image, and uses empty alt attributes for decorative elements creates a site where every visual asset works as a ranking signal. That is what makes alt text one of the highest-impact, lowest-effort optimizations available, particularly for e-commerce sites where product images drive a significant share of organic traffic through Google Images and Google Lens.
What are the different types of images that need alt text?
Not every image on a page serves the same purpose, and the alt text strategy changes depending on what the image does.
Informative images are the most common type. They add context, data, or meaning that the surrounding text does not fully cover. Product photos, team headshots, process diagrams, and screenshots all fall into this category. These images need descriptive alt text that explains what the image shows and why it matters on this specific page. A screenshot of a Core Web Vitals report on a page about page speed optimization should read "Core Web Vitals report showing LCP improvement after image compression," not "screenshot" or "chart."
Decorative images serve no informational purpose. Background patterns, divider lines, ornamental icons, and purely stylistic flourishes fall into this category. These images should use an empty alt attribute: alt="". This tells screen readers to skip the image entirely, preventing unnecessary audio clutter for users with visual impairments. The critical mistake is omitting the alt attribute entirely, which forces screen readers to announce the filename, often a string of random characters, rather than ignoring the element.
Functional images act as links or buttons. A "Buy Now" graphic, a social media icon linking to a profile, or a PDF download icon all need alt text that describes the action or destination, not the visual appearance. "Download our Wix SEO checklist PDF" is correct. "PDF icon" is not. The user needs to know what happens when they activate the element, not what it looks like.
Complex images include charts, graphs, infographics, and maps that convey detailed data. Alt text for these should provide a brief summary of the key insight, with a longer description available in the surrounding page content or via an aria-describedby reference. "Bar chart showing 34% increase in organic traffic after technical SEO remediation" is appropriate alt text. The full data breakdown belongs in the body text.
Product images in e-commerce require the most specific alt text because they directly influence purchase decisions and search visibility. Each variant, like color, size, material, or angle, needs unique alt text. "Men's navy blue running shoe with breathable mesh upper and white rubber sole, side view" attracts targeted searches that generic "product image" alt text never reaches.
How do you write alt text?
Alt text writing follows a consistent process regardless of platform, industry, or image volume.
The starting point is an image audit. Before writing a single description, identify every image on the site that lacks alt text, uses generic or filename-based alt text, or has descriptions that do not match the image content. Automated tools like Screaming Frog, WAVE, or Lighthouse can generate this inventory in minutes. Categorize each image as informative, decorative, functional, or complex. The goal is to understand the scale and prioritize high-traffic pages first.
The second step is context mapping. For every informative image, ask what the page is trying to communicate and how the image supports that goal. The same photograph of a team meeting requires different alt text on a careers page ("Marketing team collaborating on a Wix SEO strategy session in the Hasselt office") than on a services page ("SEO specialists reviewing client website performance data"). The description must serve the page's intent, not just describe the image in isolation.
The third step is drafting descriptions. Write what the image shows using clear, specific language. Include relevant keywords only when they naturally describe the image content. Avoid starting with "image of" or "picture of", because screen readers already announce the element type. Keep descriptions between 80 and 125 characters for optimal screen reader handling. Front-load the most important information in case the user stops listening early.
The fourth step is handling decorative and functional images correctly. Mark every decorative image with alt="". Never omit the attribute entirely. For functional images, write the action or destination, not the appearance. For complex images, pair concise alt text with extended descriptions in the page body.
The final step is validation. Test a sample of pages with a screen reader, like NVDA for Windows, VoiceOver for Mac, or TalkBack for Android. Listen to how the alt text flows within the surrounding content. If it sounds redundant, vague, or longer than necessary, revise it. Run Lighthouse audits to confirm no images are missing alt attributes.
For Wix websites specifically, the Wix SEO tools guide covers the platform's image editor and bulk management features. The 10 Wix SEO mistakes guide includes missing alt text as one of the most common on-page issues found in Wix audits.
What tools do you use for alt text management?
Alt text tools fall into three categories: auditing tools that find missing or low-quality alt text, generation tools that produce descriptions at scale, and guided platforms that teach you to do it yourself.
Screaming Frog is the standard technical SEO crawler for alt text audits. It scans every page on a site, extracts all image elements, and reports which ones lack alt attributes or use generic descriptions. The free version handles up to 500 URLs. For larger sites, the paid license is essential. Screaming Frog exports the full image inventory as a spreadsheet, making it the starting point for any systematic alt text remediation.
WAVE and Lighthouse are free accessibility testing tools that flag missing alt text as part of broader audits. WAVE provides a visual overlay showing exactly which images need attention. Lighthouse integrates into Chrome DevTools and scores alt text as part of its accessibility audit. Both are useful for quick checks but lack the bulk export and scale capabilities of Screaming Frog.
AI alt text generators have become practical for large-scale implementations in 2026. Tools like AltText.ai and Alt Audit analyze image content and generate context-aware descriptions that incorporate product names, page topics, and target keywords. A typical e-commerce site with 20,000 product images can reduce a 3,000-hour manual writing project to three weeks with human review queues for flagged images. AI generation should always include quality review, particularly for charts, legally sensitive content, or images with complex emotional or cultural context.
Google Search Console provides the Performance report for image search traffic. It shows which queries drive impressions and clicks to your images, revealing which alt text optimizations are working and which images rank without generating engagement. Starting alt text improvements with Search Console data means prioritizing images that already have visibility rather than guessing which ones matter.
For businesses that want to handle alt text and broader SEO themselves, the We Optimizz App is a DIY SEO platform built to teach you how to audit, optimize, and grow your own visibility. It includes guided alt text workflows, image optimization checklists, and step-by-step lessons that show you exactly what to fix and why. You learn by doing, not by reading generic guides.
For Wix websites specifically, the Wix SEO tools guide covers the platform's native image editor and bulk management features. The 10 Wix SEO mistakes guide includes missing alt text as one of the most common on-page issues found in Wix audits.
What is the difference between alt text and image SEO?
Alt text is one component of image SEO, but image SEO encompasses the full technical and strategic optimization of visual assets. Understanding the distinction prevents businesses from treating alt text as a checkbox while ignoring the broader performance and discoverability factors.
Alt text addresses accessibility and indexing. It tells search engines what an image contains and ensures users with screen readers receive equivalent information. Image SEO includes alt text but also covers file format selection (WebP for performance, JPEG for photography, PNG for transparency), compression to reduce page weight, responsive sizing for different devices, structured data markup for product images, and descriptive filenames that reinforce the alt text signal.
A page with perfect alt text but 5MB uncompressed hero images will rank poorly because Core Web Vitals penalize slow load times. A page with optimized images but missing alt text will miss Google Images traffic and fail accessibility standards. The two work together. Alt text is the most controllable on-page signal, but it only delivers full value when the image itself is technically optimized.
For businesses building on Wix, the platform handles much of the technical image optimization automatically. Responsive sizing, lazy loading, and format conversion are built-in. The gap is almost always in alt text quality and coverage, not in compression or delivery speed. The Wix SEO tools guide covers where to add alt text in the editor and how to manage it across image galleries and product pages.
When does it make sense to work with an alt text specialist?
Alt text is accessible enough that a business owner with a free Google Search Console account and a few hours can identify meaningful opportunities without external help. For a new site or a small local business in a low-competition market, that starting point is often sufficient to get image optimization moving in the right direction.
Where specialist involvement produces a measurable difference is depth, scale, and the gap between identifying missing alt text and building a strategy that compounds over time. A list of images without descriptions is not a strategy. A strategy maps alt text to page intent, assigns keyword targets, identifies which product variants need unique descriptions, and connects every image to a conversion path. That level of planning takes experience to do correctly and time to do at scale.
The businesses that consistently waste alt text investment are those that generate a list, add descriptions, and stop. Alt text needs to align with the current keyword strategy, reflect product name changes, and adapt as the site's topical focus shifts. An alt text strategy that is never revisited becomes outdated within 12 months, with product descriptions referencing discontinued items and blog screenshots showing outdated interfaces.
The other common failure point is treating alt text as purely an SEO tactic rather than an accessibility requirement. Google's John Mueller has confirmed that alt text is a ranking factor for image search, not for regular web search. The primary purpose is accessibility. Businesses that stuff keywords into alt text, use identical descriptions across every product variant, or write descriptions that do not match the image content harm both user experience and search performance. Google's algorithms treat keyword-stuffed alt text as a spam signal.
For businesses that want to handle alt text themselves but need guidance, the We Optimizz App is a DIY SEO platform that teaches you how to audit, optimize, and grow your own visibility. It includes guided alt text workflows, image optimization checklists, and step-by-step lessons that show you exactly what to fix and why. You learn by doing, not by reading generic guides. For Wix users, the app integrates with the editor to flag missing alt text across your site and walk you through the fix. If you prefer to learn SEO on your own schedule rather than hiring an agency, the We Optimizz App gives you the structure and feedback to do it correctly.
We Optimizz builds alt text audits and remediation into every SEO engagement from the start. If your site has images that generate impressions without clicks in Google Search Console, or if your accessibility audit flagged missing alt text as a critical issue, the free SEO scan identifies the most visible gaps, and a free discovery call gives you a direct assessment of where your image optimization is working and where it is not. If you want to handle it yourself, the We Optimizz App shows you exactly how.
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Want to handle alt text yourself? The We Optimizz App teaches you how to audit, fix, and optimize your own images step by step. Learn SEO by doing it, not by guessing.
