RankEngineQuick answer: describe the image below and get clean, screen-reader-friendly alt text under 125 characters — or paste existing alt text to check length, "image of" redundancy, and keyword stuffing. Good alt text describes what the image literally shows, with the attributes a shopper would search.
Free tool
Free Image Alt Text Generator & Checker for Products
Why alt text is the most neglected ranking signal in ecommerce
Most Shopify catalogs ship with empty alt attributes or auto-filled filenames ("IMG_2041.jpg") — which means three audiences get nothing: screen-reader users, Google Images (a genuine product-discovery channel), and the multimodal AI systems now deciding which product images answer shopping questions. The fix costs one descriptive sentence per image.
The formula the generator uses: attributes + subject + context, under 125 characters, no "image of" preamble, no keyword lists. It reads naturally because it is a description first — the SEO value comes from the fact that honest product descriptions naturally contain the words shoppers search: material, color, style, setting.
Two scale problems this tool cannot solve: writing alt text for hundreds of images, and describing what is actually in each image without looking. RankEngine does both — its AI vision reads each product image, writes a literal description keyed to the product, applies it through the Shopify API, and verifies every write. The image alt text guide has the full playbook if you prefer doing it by hand.
Frequently asked questions
What makes good alt text for SEO?
A specific, literal description of what the image shows, under about 125 characters, with the product’s key attributes: "Sage green linen duvet cover on an oak bed frame, morning light" — not "duvet" and not "buy linen duvet cover best price free shipping". Write for a person who cannot see the image; search engines reward exactly that.
Why 125 characters?
Screen readers historically truncate around 125 characters, and concise descriptions force specificity. It is a guideline, not a penalty threshold — but if you need 200 characters, the image probably needs a caption instead.
Should alt text start with "image of"?
No. Screen readers already announce it as an image, so "image of" wastes the first words twice over. Start with the subject: "Handmade ceramic pour-over set in matte white".
Does alt text really affect rankings?
Yes, three ways: it is a relevance signal for the page, it is the primary signal for Google Images (a real traffic source for products), and it is what multimodal AI systems read when deciding whether your product image answers a shopping query. Plus it is an accessibility requirement — the only SEO task that is also the law in many markets.
How do I add alt text in Shopify?
Open the product, click the image, choose "Edit alt text", save. For a whole catalog that is hundreds of clicks — RankEngine writes alt text for every product image via AI vision (it looks at the actual image), applies it through the Shopify API, and verifies each write landed.
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Run this across your whole catalog
RankEngine applies and verifies these fixes on every product in your Shopify store — automatically.
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