AI Auto Alt Text Generator

AI Auto Alt Text Generator is a lightweight, privacy-conscious plugin that uses OpenAI’s GPT-4o mini vision model to create meaningful, screen-reader-friendly alt text and SEO-friendly titles for your images. Whether you add a single image, bulk-process your library, or just want a one-click fix in the Media Library, the plugin handles it all – no manual effort required. This solution is far cheaper than many solutions due to cutting out the middle-person, but this does mean you need to bring your own OpenAI API key. ✨ Key features

• Automatic alt text on upload – set-and-forget accessibility.
• Optional automatic image titles – improve SEO with descriptive titles.
• One-click manual generation – “Generate Alt Text & Title” button in Media Library.
• Bulk update tool – batch-process existing images with rate-limit control.
• Prompt fine-tuning – supply site-wide context and optionally include the image file name.
• Image size & detail control – choose the resolution and level of visual detail sent.
• No extra servers – data flows only between your site and OpenAI; nothing is stored off-site.

🧠 How it works

1. When an image is uploaded (or manually chosen), the plugin creates a temporary public URL for that image.
2. It sends the image – plus optional context such as the parent post title, your custom site context and the file name – to OpenAI’s gpt-4o-mini vision model.
3. GPT-4o returns a concise description.
4. Alt text is stored in WordPress’ native _wp_attachment_image_alt field.
5. (Optional) The returned title is stored as the attachment post title.
6. Nothing is cached or stored on OpenAI’s side; only the final strings live in your database.