Images make web pages more engaging, but search engines and screen readers cannot see pictures the way people do. They rely on text signals to understand what an image shows, and the most important of these is the alt attribute, commonly called alt text. Properly formatted alt text improves accessibility for visually impaired users, helps images rank in Google Images, supports the overall relevance of a page, and provides fallback text if an image fails to load. Writing it well is a small task with meaningful benefits.
Image SEO Expertise From AAMAX.CO
AAMAX.CO is a full-service digital marketing company offering web development, digital marketing, and SEO services worldwide. Their team audits image libraries, writes descriptive alt text at scale, optimizes file names and compression, and implements responsive image techniques. Businesses that want image optimization handled as part of comprehensive SEO services can rely on them for accessible, search-friendly websites.
What Alt Text Looks Like in HTML
Alt text is added within the image tag using the alt attribute. For example, an image of a dog might use the attribute alt="Golden retriever puppy playing with a red ball in a grassy park." Most content management systems, including WordPress, Shopify, Wix, and Webflow, provide an "Alt Text" or "Alternative Text" field in the media library, so you do not need to edit code manually.
Why Alt Text Matters
- Accessibility: Screen readers read alt text aloud, allowing visually impaired users to understand images. This is also a requirement under accessibility standards such as WCAG.
- Image search visibility: Google uses alt text, along with surrounding content and file names, to understand and rank images.
- Page relevance: Descriptive alt text reinforces the topic of the page.
- Fallback content: If an image fails to load, browsers display the alt text instead.
Rule 1: Describe the Image Accurately
Write what the image actually shows. Imagine describing it to someone who cannot see it. Include relevant details such as subjects, actions, colors, and context when they matter. For example, "Woman using a laptop at a cafe table with a coffee cup" is more useful than "woman" or "laptop."
Rule 2: Keep It Concise
Alt text should generally be brief, often under about 125 characters, because some screen readers cut off longer text. Focus on the most important information. If an image requires a detailed explanation, such as a complex chart, provide the full description in the surrounding text or a caption and keep the alt text summary-focused.
Rule 3: Include Keywords Naturally
If the image relates to the page's target keyword, it is appropriate to include it, but only when it accurately describes the image. On a page about "stainless steel espresso machines," an image alt of "Stainless steel espresso machine with dual boilers on a kitchen counter" is natural and helpful. Avoid stuffing keywords, such as "espresso machine best espresso machine buy espresso machine cheap," which harms accessibility and may be seen as spam.
Rule 4: Avoid Redundant Phrases
Do not begin alt text with "image of" or "picture of." Screen readers already announce that the element is an image. Simply describe the content. The exception is when the format matters, such as "Illustration of" or "Screenshot of," where it adds useful context.
Rule 5: Handle Decorative Images Properly
Images that are purely decorative, such as background patterns or design flourishes, should use an empty alt attribute, written as alt="". This tells screen readers to skip them, preventing unnecessary noise. Do not omit the alt attribute entirely, as some screen readers will then read the file name instead.
Rule 6: Describe Functional Images by Their Purpose
For images that act as links or buttons, such as a magnifying glass icon for search or a logo linking to the homepage, describe the function rather than the appearance. Use "Search" or "AAMAX.CO homepage" style descriptions rather than "magnifying glass icon."
Rule 7: Include Text Shown in Images
If an image contains important text, such as an infographic headline or a promotional banner, include that text in the alt attribute or nearby content. Search engines and screen readers cannot reliably read text embedded in images.
Rule 8: Make Product Alt Text Specific
For ecommerce, include distinguishing details like brand, model, color, and angle. For example, "Navy blue waterproof hiking jacket with hood, front view" helps differentiate multiple product images and supports long-tail search queries.
Complementary Image SEO Practices
- Use descriptive, hyphenated file names, such as navy-waterproof-hiking-jacket.jpg.
- Compress images and use modern formats like WebP or AVIF for faster loading.
- Specify width and height to prevent layout shifts.
- Use responsive images with srcset for different screen sizes.
- Place images near relevant text and use captions where helpful.
- Include important images in image sitemaps.
Auditing Alt Text on Your Site
Use crawling tools to find images with missing or overly long alt text. Accessibility checkers such as WAVE and Lighthouse also flag missing alt attributes. Prioritize important pages, such as product and service pages, and update alt text systematically.
Conclusion
Formatting image alt text for SEO is about clarity and purpose. Describe images accurately and concisely, include keywords only when natural, avoid redundant phrases, use empty alt attributes for decorative images, and describe functional images by their action. Combined with good file names, compression, and responsive images, effective alt text improves accessibility, image search visibility, and the overall quality of your website.
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