Why Alt Text Is Critical for Image SEO
Alt text (alternative text) is the HTML attribute that describes an image to search engines and screen readers. Google cannot see images — it reads alt text to understand image content, determine relevance to surrounding content, and decide whether to index the image in Google Images. Pages with descriptive, keyword-rich alt text consistently outperform pages with empty or generic alt attributes in both standard and image search rankings.
Alt Text Best Practices
Effective alt text is specific, descriptive, and naturally incorporates the page's target keyword where genuinely relevant. The optimal length is 50-125 characters — long enough to be descriptive, short enough to avoid appearing spammy. Avoid starting with "image of" or "picture of" (Google already knows it's an image). For decorative images that add no informational value, use empty alt text (alt="") to tell screen readers and search engines to skip them.
How to Use the Alt Text Generator
Describe what the image shows in the description field — be specific about subjects, actions, and context. Select the image context type: product photos, infographics, screenshots, and portraits each have different optimal alt text structures. Optionally enter your target keyword for natural incorporation. The generator produces three variations — a direct description, a keyword-focused variant, and a contextual variant — all with character count indicators to keep you in the 50-125 char sweet spot.
Alt Text for E-Commerce Product Images
Product images require especially precise alt text because they're evaluated by Google Shopping's image matching algorithm. Include the product name, key identifier (color, model, size), and brand name. For variant images, specify the variant: "Nike Air Max 90 — Red/White, Size US 10" rather than just "Nike sneaker." Consistent, specific product alt text across your catalogue significantly improves Google Shopping impression share.
Alt Text and Accessibility
Beyond SEO, alt text is a legal accessibility requirement under WCAG 2.1 guidelines and ADA compliance for US businesses. Screen readers used by visually impaired users read alt text aloud — poorly written or missing alt text creates exclusionary experiences. Writing good alt text for SEO and accessibility simultaneously is best practice: describe the image accurately, include relevant context, and avoid keyword stuffing that degrades the experience for assistive technology users.