內容簡介
AI Auto Alt Text Generator 是一款輕量且注重隱私的外掛，透過 OpenAI 視覺模型自動為圖片產生適合螢幕閱讀器的替代文字與 SEO 友善標題，支援上傳自動產生、單張手動產生及批次處理，只需自備 OpenAI API 金鑰即可使用，成本遠低於同類方案。
【主要功能】
• 上傳圖片時自動產生替代文字
• 一鍵手動產生替代文字與標題
• 批次處理媒體庫中的既有圖片
• 可自訂提示詞語境與網站脈絡
• 支援多種 OpenAI 模型切換選擇
• 支援多語系輸出，含英式英文等選項
外掛標籤
開發者團隊
原文外掛簡介
AI Auto Alt Text Generator is a lightweight, privacy-conscious plugin that uses OpenAI vision-capable models (defaulting to GPT-4o mini, with GPT 5 Mini/Nano options) 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 alternatives because it cuts out the middle-person. You’ll just 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 the Media Library.
Bulk update tool – batch-process existing images (five at a time) with a configurable pause between batches.
Prompt fine-tuning – supply site-wide context and optionally include the image file name.
Model selection – choose GPT-4o mini (default) or GPT 5 Mini/Nano (BETA).
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.
Multilingual output – choose English (UK), English (US) or other popular languages. (English US is the default.)
🧭 Where to find the bulk tool
Tools → Bulk Alt Text Update
Media → Bulk Alt Text Update (shortcut that redirects to the Tools page)
Settings → Alt Text Generator includes a button linking straight to the bulk page
🧠 How it works
When an image is uploaded (or manually chosen), the plugin creates a temporary public URL for that image.
It sends the image – plus optional context such as the parent post title, your custom site context and the file name – to your selected OpenAI vision model.
OpenAI returns a concise description.
Alt text is stored in WordPress’ native _wp_attachment_image_alt field.
(Optional) The returned title is stored as the attachment post title.
Nothing is cached or stored on OpenAI’s side; only the final strings live in your database.
Settings overview
OpenAI API Key – Required to connect to GPT-4o.
OpenAI Model – GPT-4o mini (default), GPT 5 Mini (BETA), or GPT 5 Nano (BETA).
Image Size to Send – Thumbnail, Medium, Large, or Full.
Image Detail Quality – ‘Low’ or ‘High’ (Low uses fewer tokens).
Bulk batch size – Number of images per batch (lower values reduce rate-limit risk).
Site Context – Optional free-form prompt guidance (brand voice, niche, etc.).
Send Image File Name – Include file name in the prompt for extra context.
Automatically Generate Title – Add descriptive titles alongside alt text.
Use full context for image titles – When enabled, title generation includes site context and file name (uses more tokens).
Bulk optimiser delay (seconds) – Pause between batches during bulk runs.
OpenAI request timeout (seconds) – Max wait time for OpenAI responses (10–120s) to reduce timeout failures on slower hosts.
Output Language – Default English (US). Choose English (UK) for British spellings or another popular language; outputs (alt text and titles) will be generated in the selected language.
External services
This plugin connects to the OpenAI API to generate alt text and (optionally) image titles.
Endpoint: https://api.openai.com/v1/chat/completions
When called:
On image upload (automatic)
Via “Generate Alt Text & Title” button in Media Library (manual)
Via Tools → Bulk Alt Text Update (bulk)
Data sent: image URL, optional file name, optional site context, optional parent post title
Terms: https://openai.com/policies/terms-of-use
Privacy: https://openai.com/policies/privacy-policy
