Image Captioner

What It Does

Automatically generate alt text and descriptive captions for images using multimodal AI. Improve your site's accessibility compliance and image SEO without manually writing descriptions for every asset.

Send an image — get back accessibility-ready alt text and optional long-form captions.

How It Works

1. Send an image to your proxy endpoint (URL or base64)
2. Knowledge context — if you've uploaded brand or product information, the AI uses it to write more specific descriptions
3. Multimodal analysis — the AI examines the image content, text, objects, and context
4. Structured output — returns concise alt text (under 125 chars) and optional detailed caption

Use Cases

• E-commerce — auto-generate product image descriptions for thousands of SKUs
• Content platforms — ensure every user-uploaded image has proper alt text for WCAG compliance
• Media companies — generate captions for photo libraries and image archives at scale
• SEO teams — improve image search rankings with descriptive, keyword-aware alt text

Accessibility Compliance

Alt text is a WCAG 2.1 Level A requirement. This proxy generates descriptions that follow accessibility best practices — concise, functional, and descriptive without being redundant.