To optimize alt text, Yoast says site owners should describe what an image shows and why it matters to the page. The guidance treats alternative text as part of the content, serving screen reader users while helping search engines interpret images.
Its article, Image SEO: How to optimize alt, distinguishes alt text from an image title attribute. Alt text is read by screen readers and can help search engines understand an image’s content and purpose. A title attribute usually appears as a hover tooltip, but screen readers do not reliably announce it and mobile users cannot see it.
Optimize Alt Text for the Image’s Purpose
Yoast advises adding alt text to images that communicate information. For an image showing statistics, the description should explain what those statistics represent. A decorative image does not necessarily need a description; an empty alt attribute lets screen readers skip it.
The distinction matters because a missing description can leave a screen reader user without information conveyed by an image. Describing an image that adds no meaning can create unnecessary narration. Yoast recommends considering the image’s value to the reader instead of treating every image field as a place to add keywords.
The article cautions against repeating a focus phrase in every image description. Its account of Google’s advice calls for useful, information-rich alt text that uses keywords in context. Keyword stuffing can harm user experience and may cause a site to be seen as spam.
Give Search Tools Specific Image Details
Yoast says descriptive alt text can help search engines and AI systems understand images alongside page content. The article describes visual search uses in which people point a phone at an object or submit a photo. Google Lens and AI Mode in Search accept images, according to the source.
For product images, the article recommends including relevant names, features, colors and context. It gives the example of a red waterproof running shoe with a size and breathable mesh upper. Those details can connect an image to a search, but only when they accurately describe what is pictured.
Yoast recommends descriptive filenames rather than generic camera names. It says structured data can describe image content to search engines and help AI platforms categorize it. Alt text describes the image, while filenames and structured data add further context.
For broader site presentation, responsive web design guidance covers how user-friendly pages work across devices. A discussion of brand credibility in AI search considers how AI systems understand and cite brand information. A related AI search optimization guide also discusses how systems retrieve and cite brand information. Together, these topics provide context for clear image descriptions.
Review AI Suggestions Before Publishing
Yoast presents AI tools as a way to speed up alt text work, especially across large product catalogs. Its example describes a “blue ceramic mug with handle on wooden table” from a product image. The article says these tools can recognize products, colors, settings and actions.
But AI can miss product-specific details and the difference between decorative images and those carrying important information. It may also produce a description that does not help someone who cannot see the image. Yoast says the person responsible must review each suggestion, correct errors, and rewrite or regenerate descriptions when needed.
It recommends automation for high-volume catalog work while giving closer human attention to homepage hero images, landing pages, charts, infographics and screenshots. Those visuals may need context that a generic description cannot supply.
The next step is to inspect each image’s role, write or review a concise description that matches its visible content, and leave decorative images empty when appropriate. Yoast also suggests testing images with Google Lens and revising the text if results do not match. Careful review keeps efforts to optimize alt text grounded in what each image shows.
