Show HN: I auto-generate alt text using Gemini 3 Flash (sarthakmishra.com)

A developer recently shared an innovative solution for automating alt text generation using Google's Vision AI model, Gemini 3 Flash. The approach addresses a critical accessibility issue—poor or missing alt text—that negatively impacts screen reader users and SEO performance. By integrating a streamlined workflow into their portfolio site's build process, the developer efficiently scans image files, generates concise descriptions based on visual content, and injects this metadata directly into their components, significantly reducing the tedious manual effort usually required. The technical implementation features a caching mechanism that utilizes SHA-256 hashing to detect changes in images, ensuring that alt text is only generated when necessary, leading to faster builds and minimal costs. The system converts images to a suitable format before sending them to the AI model, and it builds a JSON map that links images to their respective alt text. This solution not only enhances accessibility by providing meaningful descriptions for screen readers but also maintains the website's performance as a static build, showcasing how AI can effectively solve long-standing challenges in web development.