Alt text (alternative text) is a written description of an image that appears in the HTML alt attribute. It serves two critical purposes: accessibility — allowing screen readers to describe images to visually impaired users — and SEO — helping search engines understand image content for better indexing and ranking in image search results. Without alt text, your images are essentially invisible to both screen readers and search engines.

The generally recommended maximum length for alt text is 125 characters. This limit exists because some popular screen readers (like JAWS) may truncate alt text longer than 125 characters. Aim for concise yet descriptive — typically between 20 and 100 characters works best. If an image requires a very long description, consider using the longdesc attribute or providing a detailed description in the surrounding text content.

Yes, but naturally and sparingly. Include relevant keywords when they genuinely describe the image content. Never keyword-stuff your alt text — this is considered spam by search engines and can harm your rankings. Google's algorithms are sophisticated enough to detect unnatural keyword usage. The golden rule: write alt text first for humans (accessibility), and SEO benefits will follow naturally. A well-described image with one relevant keyword is far better than a stuffed one with five.

Alt text (alt attribute) is used by screen readers and displayed when an image fails to load. It's essential for accessibility and SEO. The title attribute (title) typically appears as a tooltip on hover and is not read by most screen readers by default. While the title can provide supplementary information, never rely on it as a substitute for alt text. Best practice: always include alt text; use the title attribute only for additional, non-essential information.

Decorative images (those that add no meaningful information) should use an empty alt attribute: alt="". This tells screen readers to skip the image entirely, preventing unnecessary noise. However, do not omit the alt attribute — a missing alt is different from an empty one. Missing alt attributes cause screen readers to read the filename, which creates a poor user experience. Use empty alt text (alt="") only for truly decorative images that convey no information.

Alt text impacts SEO in several ways: 1) Image Search — well-described images rank higher in Google Images, driving additional traffic. 2) Contextual Relevance — alt text helps search engines understand the overall topic of your page. 3) Accessibility Compliance — Google favors accessible websites, and proper alt text is a key accessibility factor (WCAG 2.1 guidelines). 4) User Experience Signals — better accessibility leads to lower bounce rates and higher engagement, indirectly boosting rankings. Studies show pages with optimized alt text can see up to 20% more organic traffic from image search alone.

Yes, AI-powered image recognition has advanced significantly and can be used to assist in generating alt text. Tools like this one combine image analysis (color detection, dimension analysis, file metadata) with your contextual input to create accurate descriptions. However, human review is still essential — AI may miss cultural context, brand-specific details, or nuanced meanings. The best approach is AI-assisted + human-refined: let tools generate a solid draft, then review and adjust to ensure accuracy and brand alignment.