Images make websites more engaging, but search engines cannot see them the way people do. They rely on surrounding text, file names, structured data, and most notably, alt text to understand what an image depicts. Alt tags, more accurately called alt attributes, also serve a critical accessibility purpose by describing images to people who use screen readers. So how important are alt tags for SEO? They are a meaningful on-page factor, especially for image search, and they contribute to a more accessible, higher-quality website overall.
How AAMAX.CO Optimizes Images for Search and Accessibility
Image optimization is an often-overlooked part of on-page SEO, and it is one that AAMAX.CO handles with care. They are a full-service digital marketing company offering web development, digital marketing, and SEO services worldwide. Their team audits websites for missing or poorly written alt text, compresses images for faster loading, and implements descriptive file naming conventions. As part of their search engine optimization work, they ensure visual content supports rankings, accessibility compliance, and a better experience for every visitor.
What Are Alt Tags?
Alt text is an attribute added to an image element in HTML that provides a textual alternative to the image. If an image fails to load, the alt text is displayed in its place. Screen readers read alt text aloud to users with visual impairments. Search engines use it as one of several signals to understand image content and its relevance to the surrounding page.
Why Alt Tags Matter for SEO
They Help Images Rank in Image Search
Google Images and visual search tools drive substantial traffic in many industries, including ecommerce, travel, food, fashion, and home improvement. Descriptive alt text helps search engines match your images with relevant queries, increasing the chances they appear in image results and bring visitors to your site.
They Reinforce Page Relevance
Alt text provides additional context about the page topic. When images are described accurately and naturally include relevant terms, they reinforce the subject matter of the content, supporting overall topical relevance.
They Support Accessibility
Accessibility and SEO are closely connected. Search engines increasingly reward websites that provide good experiences for all users. Alt text is also a fundamental requirement of web accessibility guidelines, helping organizations meet legal and ethical obligations while serving a broader audience.
They Help With Linked Images
When an image is used as a link, its alt text functions similarly to anchor text. It tells search engines and screen reader users what the linked page is about, so descriptive alt text on linked images is especially important.
How Important Are They Compared to Other Factors?
Alt text is not as influential as high-quality content, backlinks, or technical health for web search rankings. However, it is a low-effort, high-value optimization that contributes to a well-rounded page. For image-heavy websites and ecommerce stores, alt text can have a noticeable impact on traffic from image search. Ignoring it means leaving easy opportunities on the table.
How to Write Effective Alt Text
- Be descriptive and specific: Describe what the image shows clearly, as if explaining it to someone who cannot see it.
- Keep it concise: Aim for a short phrase or sentence, typically under 125 characters.
- Include keywords naturally: Use relevant terms only when they accurately describe the image.
- Avoid redundant phrases: Skip "image of" or "picture of," since screen readers already announce images.
- Provide context: Describe the image in relation to the page content when helpful.
- Use empty alt for decorative images: Purely decorative images should have an empty alt attribute so screen readers skip them.
Good vs. Poor Alt Text Examples
- Poor: "shoes"
- Keyword-stuffed: "running shoes best running shoes cheap running shoes buy running shoes"
- Good: "Blue lightweight men's running shoes with breathable mesh upper"
The good example is specific, natural, and genuinely helpful to both users and search engines.
Other Image SEO Best Practices
- Use descriptive, hyphenated file names instead of generic camera names.
- Compress images and serve modern formats like WebP or AVIF.
- Specify image dimensions to prevent layout shifts.
- Use responsive images to serve appropriate sizes on different devices.
- Place images near relevant text for better contextual understanding.
- Include images in XML sitemaps where useful.
Auditing Alt Text Across Your Website
Use a site crawler to identify images missing alt attributes across your website. Prioritize high-traffic pages, product pages, and key landing pages first. On WordPress and other CMS platforms, you can edit alt text directly in the media library. For large ecommerce catalogs, create templates that combine product names and key attributes, then refine important products manually.
Final Thoughts
Alt tags are an important part of SEO, particularly for image search visibility and accessibility. While they are not the most powerful ranking factor on their own, they strengthen page relevance, improve user experience, and help your visual content reach more people. Write descriptive, concise, and natural alt text for every meaningful image, and combine it with broader image optimization practices to get the full benefit.
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