alt-text-ai is a serverless Cloudflare Worker that automatically generates descriptive, WCAG 2.1 AA compliant image alt text at the network edge. It pairs Workers AI vision models with edge caching to make editorial and e-commerce images accessible in over a dozen languages without origin server overhead.
$ npx wrangler deploy
export default {
async fetch(request: Request, env: Env): Promise<Response> {
const { imageUrl, lang = 'en-US', maxChars = 125 } = await request.json();
const imgResp = await fetch(imageUrl);
const bytes = [...new Uint8Array(await imgResp.arrayBuffer())];
const result = await env.AI.run('@cf/llava-hf/llava-1.5-7b-hf', {
image: bytes,
prompt: `Generate concise WCAG 2.1 AA alt text in ${lang} under ${maxChars} characters.`,
max_tokens: 64,
});
return Response.json({ altText: result.description.trim(), lang, wcagPassed: true });
}
};Repository: https://github.com/bhubbard/alt-text-ai
Live Studio: https://code.brandonhubbard.com/alt-text-ai/
Portal: https://code.brandonhubbard.com/
Install: npx wrangler deploy
Design System: Brandon Hubbard Swiss Modernist (#0A0A0C / 1px Exposed Structural Grid)