Alt text and SEO metadata for AI-generated product photos

Quick Answer

Write alt text for the image's purpose on that page, not for an SEO word count: describe the essential product information in an informative image, use alt="" for a decorative image, and name the destination or action of a functional image. Then support image discovery with a short descriptive filename, accurate nearby copy, a crawlable image URL, and relevant product structured data; keep AI provenance or disclosure in the channel-required metadata or disclosure field unless the image's AI origin is itself important to its purpose.

How should alt text describe an AI-generated product photo?

The W3C Web Accessibility Initiative says a text alternative should convey the information or function of an image in its specific context. That means product-photo alt text is not always a literal inventory of everything visible.

Image purpose	What the alt text should do	Example
Informative product image	Convey the product detail, view, or context that the image adds	`Navy leather tote, front view, with brass clasp`
Decorative image	Use an empty attribute so assistive technology can skip it	`alt=""`
Functional linked image or button	Name the destination or action rather than its appearance	`View navy tote product details`

Account for adjacent text. If the product name and color are already stated beside a gallery, Front view showing brass clasp may be more useful than repeating the full listing title. Give each informative gallery image text that distinguishes its view or detail, but use alt="" when an image adds nothing beyond nearby copy.

There is no universal 5-to-15-word rule or 125-character accessibility limit in W3C or Google guidance. Use the shortest text that conveys the image's purpose. Google's image SEO guidance says it uses alt text with computer vision and page content to understand an image, and warns against keyword stuffing. Write for the person who cannot see the image; search relevance follows from an accurate description in a relevant page context.

Describe the finished image, not the prompt. Include “AI-generated” in alt text only when the origin is information the image is meant to communicate, such as in an educational comparison. For an ordinary product listing, provenance belongs elsewhere.

Which fields matter for product-image SEO besides alt text?

Image SEO depends on the page and delivery setup as well as the file. Use each field for its actual job:

Field	Good practice
Filename and URL	Use a short descriptive name such as `navy-leather-tote-front.jpg`; keep the extension consistent with the real format. Google calls the filename a very light clue, not a place for a keyword list.
Nearby copy and caption	State accurate product, variant, and view information that helps a buyer. Do not duplicate alt text word for word when the visible copy can add context.
Product structured data	Associate the product page with the correct, crawlable image URL. Google says `Product` structured data can support richer appearances in Search, Google Images, and Lens.
Rights and license metadata	When relevant, provide creator, credit, copyright, or license information through `ImageObject` structured data or IPTC metadata. These fields describe rights; they do not replace alt text.

An HTML title attribute is optional advisory text. It is not a substitute for an alt attribute or a visible caption.

Where should AI disclosure and provenance metadata go?

AI provenance and buyer-facing disclosure are separate from accessibility text, and the destination decides what is required. Google Merchant Center requires generative-AI product images submitted through its image fields to retain an embedded IPTC DigitalSourceType value and tells merchants not to strip that metadata. The IPTC Photo Metadata User Guide distinguishes media created with generative AI (trainedAlgorithmicMedia) from captured media edited with generative AI (compositeWithTrainedAlgorithmicMedia). Check the channel's current rule for the exact case because its accepted values and visible disclosure controls may differ.

Content Credentials can record provenance and editing history, but they do not replace a marketplace checkbox, ad disclosure, or feed requirement. Also test the published delivery file: export tools, storefront processors, and CDNs can re-encode an image, so confirm required embedded metadata after upload.

For a Nightjar-generated Asset, describe what the downloaded image actually shows. Nightjar's Asset detail view can help trace source inputs and generation details, but those records do not replace page-level alt text or destination-specific metadata. Rename the delivery file and verify its embedded metadata before publishing it to a sales channel.