Connor Bulmer

AI Auto Alt Text Generator is a lightweight, privacy-conscious plugin that uses OpenAI vision-capable models (defaulting to GPT-5.4 nano, with GPT-5.4 mini and legacy GPT-4o mini 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.
<h3>✨ Key features</h3>
<ul>
<li>Automatic alt text on upload – set-and-forget accessibility.</li>
<li>Optional automatic image titles – improve SEO with descriptive titles.</li>
<li>One-click manual generation – “Generate Alt Text & Title” button in the Media Library.</li>
<li>Bulk update tool – batch-process existing images, including those that only have filename-based alt text, with a configurable pause between batches.</li>
<li>Prompt fine-tuning – supply site-wide context and optionally include the image file name.</li>
<li>Model selection – default to GPT-5.4 nano (fastest & cheapest) or switch to GPT-5.4 mini for higher quality; legacy GPT-4o mini and GPT-5 mini/nano remain available.</li>
<li>Image size & detail control – choose the resolution and level of visual detail sent.</li>
<li>Developer-friendly – filters and actions to customise prompts, models and output, plus optional outgoing webhooks.</li>
<li>WordPress Abilities API – registers a <code>generate-alt-text</code> ability (WordPress 6.9+/7.0) so core AI, agents and automation tools can generate alt text.</li>
<li>No extra servers – data flows only between your site and OpenAI; nothing is stored off-site.</li>
<li>Multilingual output – choose English (UK), English (US) or other popular languages. (English US is the default.)</li>
</ul>
<h3>🧭 Where to find the bulk tool</h3>
<ul>
<li>Tools → Bulk Alt Text Update</li>
<li>Media → Bulk Alt Text Update (shortcut that redirects to the Tools page)</li>
<li>Settings → Alt Text Generator includes a button linking straight to the bulk page</li>
</ul>
<h3>🧠 How it works</h3>
<ol>
<li>When an image is uploaded (or manually chosen), the plugin creates a temporary public URL for that image.</li>
<li>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.</li>
<li>OpenAI returns a concise description.
<ul>
<li>Alt text is stored in WordPress’ native <code>_wp_attachment_image_alt</code> field.</li>
<li>(Optional) The returned title is stored as the attachment post title.</li>
</ul>
</li>
<li>Nothing is cached or stored on OpenAI’s side; only the final strings live in your database.</li>
</ol>
<h3>Settings overview</h3>
<ul>
<li>OpenAI API Key – Required to connect to OpenAI.</li>
<li>OpenAI Model – GPT-5.4 nano (default), GPT-5.4 mini, or legacy GPT-4o mini / GPT-5 mini / GPT-5 nano.</li>
<li>Image Size to Send – Thumbnail, Medium, Large, or Full.</li>
<li>Image Detail Quality – ‘Low’ or ‘High’ (Low uses fewer tokens).</li>
<li>Bulk batch size – Number of images per batch (lower values reduce rate-limit risk).</li>
<li>Site Context – Optional free-form prompt guidance (brand voice, niche, etc.).</li>
<li>Send Image File Name – Include file name in the prompt for extra context.</li>
<li>Automatically Generate Title – Add descriptive titles alongside alt text.</li>
<li>Use full context for image titles – When enabled, title generation includes site context and file name (uses more tokens).</li>
<li>Bulk optimiser delay (seconds) – Pause between batches during bulk runs.</li>
<li>OpenAI request timeout (seconds) – Max wait time for OpenAI responses (10–120s) to reduce timeout failures on slower hosts.</li>
<li>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.</li>
<li>Webhook URL & signing secret – Optionally POST generated alt text/titles to an external endpoint (with an optional HMAC-SHA256 signature) for automation and logging.</li>
</ul>
<h3>Developers</h3>
The plugin is extensible via standard WordPress hooks, an outgoing webhook, and the WordPress Abilities API.
Filters
<ul>
<li><code>aatg_alt_text_prompt</code> ( $prompt, $post_ID, $context ) – customise the alt-text prompt.</li>
<li><code>aatg_image_title_prompt</code> ( $prompt, $post_ID, $context ) – customise the title prompt.</li>
<li><code>aatg_openai_request_payload</code> ( $payload, $context, $messages ) – customise the full OpenAI request (model, messages, reasoning effort).</li>
<li><code>aatg_generated_alt_text</code> ( $alt_text, $post_ID ) – filter alt text before it is saved.</li>
<li><code>aatg_generated_title</code> ( $title, $post_ID ) – filter the title before it is saved.</li>
<li><code>aatg_is_low_quality_alt</code> ( $is_low, $alt, $post_ID ) – control which existing alt text the bulk tool regenerates.</li>
<li><code>aatg_webhook_payload</code> ( $payload, $post_ID, $result ) – customise the outgoing webhook body.</li>
<li><code>aatg_supported_image_extensions</code> ( $extensions ) – customise which image formats are sent to OpenAI (default: PNG, JPEG, GIF, WebP).</li>
</ul>
Actions
<ul>
<li><code>aatg_after_alt_text_generated</code> ( $post_ID, $alt_text )</li>
<li><code>aatg_after_title_generated</code> ( $post_ID, $title )</li>
<li><code>aatg_after_generation</code> ( $post_ID, $result )</li>
</ul>
Outgoing webhook
Set a Webhook URL under Settings → Integrations & Webhooks to receive a non-blocking JSON POST after each generation. If a signing secret is set, requests include an <code>X-AATG-Signature: sha256=…</code> header (HMAC-SHA256 of the body) so your endpoint can verify authenticity.
WordPress Abilities API
On WordPress 6.9+ the plugin registers the ability <code>ai-auto-alt-text/generate-alt-text</code> (input: <code>attachment_id</code>) so WordPress core AI, agents, MCP servers and automation tools can generate alt text programmatically. Execute it with <code>wp_get_ability( 'ai-auto-alt-text/generate-alt-text' )->execute( array( 'attachment_id' => 123 ) )</code>.
<h3>External services</h3>
This plugin connects to the OpenAI API to generate alt text and (optionally) image titles.
<ul>
<li>Endpoint: <code>https://api.openai.com/v1/chat/completions</code></li>
<li>When called:
<ul>
<li>On image upload (automatic)</li>
<li>Via “Generate Alt Text & Title” button in Media Library (manual)</li>
<li>Via Tools → Bulk Alt Text Update (bulk)</li>
</ul>
</li>
<li>Data sent: image URL, optional file name, optional site context, optional parent post title</li>
<li>Terms: <a href="https://openai.com/policies/terms-of-use" rel="nofollow ugc">https://openai.com/policies/terms-of-use</a></li>
<li>Privacy: <a href="https://openai.com/policies/privacy-policy" rel="nofollow ugc">https://openai.com/policies/privacy-policy</a></li>
</ul>
If you configure a Webhook URL, generated alt text/titles (and the image URL) are also sent to that endpoint you control.

AI Auto Alt Text Generator

Automatically generates alt text and image titles for your WordPress media uploads with selectable OpenAI models (defaulting to GPT-5.

Winning Solutions

Image Alt Text Generator by Winning Solutions uses advanced AI to automatically generate accurate and descriptive alt text for your images, improving both accessibility and SEO.
<h4>Key Features</h4>
<ul>
<li>One-Click Generation: Generate alt text directly from the media library with a single click</li>
<li>Bulk Processing: Process multiple images at once with the bulk action feature</li>
<li>Automatic Upload Processing: Automatically generate alt text for images when they are uploaded to WordPress</li>
<li>Customizable Options: Choose to generate alt text, titles, and descriptions</li>
<li>Language Support: Support for multiple languages</li>
<li>WordPress Integration: Seamlessly integrates with WordPress media library</li>
</ul>
<h4>Benefits</h4>
<ul>
<li>Improved Accessibility: Make your website more accessible to visitors using screen readers</li>
<li>Better SEO: Enhance your SEO with descriptive image alt text that search engines can understand</li>
<li>Time Saving: Save hours of manual work with automatic generation</li>
<li>Accuracy: Get high-quality descriptions using state-of-the-art AI technology</li>
</ul>
<h4>How It Works</h4>
<ol>
<li>Install and activate the plugin</li>
<li>Enter your API key in the settings page</li>
<li>Configure automatic upload processing (optional) to generate alt text for new images automatically</li>
<li>Select images in your media library</li>
<li>Click “Generate Alt Text” on single images or use the bulk action feature</li>
<li>Review and save the generated text</li>
</ol>
<h4>API Key</h4>
This plugin requires an API key to function. You can get a free API key with limited credits at <a href="https://www.alt-text-generator.com" rel="nofollow ugc">alt-text-generator.com</a>. Premium plans with more credits are also available.
<h3>Privacy Policy</h3>
Image Alt Text Generator by Winning Solutions sends image URLs to our API service for processing. The image content is analyzed by our AI models to generate descriptive alt text.
This plugin: 
* Collects and processes image URLs and content for alt text generation 
* Uses an API key to authenticate requests to our service 
* Does not collect personal user data 
* Includes a privacy policy statement that you can add to your site’s privacy policy
For more details, visit our <a href="https://www.winning-solutions.de/datenschutzerklaerung" rel="nofollow ugc">Privacy Policy</a>.
<h3>External services</h3>
This plugin uses Supabase Edge Functions to connect to OpenAI’s ChatGPT API for generating AI-powered alt text descriptions of images. This service is essential for the plugin’s core functionality.
What data is sent and when: 
* Image URLs: The plugin sends the public URL of images to our Supabase Edge Functions when you manually generate alt text or when automatic processing is enabled for new uploads 
* API Key: Your API key is sent with each request for authentication 
* Language preference: Your selected language code (e.g., ‘en’, ‘de’, ‘fr’) is sent to generate alt text in your preferred language 
* Generation preferences: Settings indicating whether to generate title, alt text, description, and caption 
* SEO keywords: If enabled, relevant keywords from your content are sent to help generate more SEO-friendly alt text
When data is sent: 
* When you click “Generate Alt Text” on individual images in the media library 
* When you use the bulk action to process multiple images 
* When automatic processing is enabled and new images are uploaded to WordPress 
* When validating your API key in the settings 
* When checking your API credits (hourly, cached)
Service provider information: 
* Primary Service: Supabase Edge Functions (infrastructure) 
* AI Service: OpenAI ChatGPT API (image analysis and description generation) 
* Domain: lpsigsfofcsgnwkrasvn.supabase.co 
* Purpose: AI-powered image analysis and alt text generation using OpenAI’s vision models 
* Supabase Terms of Service: <a href="https://supabase.com/terms" rel="nofollow ugc">Supabase Terms of Service</a> 
* Supabase Privacy Policy: <a href="https://supabase.com/privacy" rel="nofollow ugc">Supabase Privacy Policy</a> 
* OpenAI Terms of Service: <a href="https://openai.com/terms" rel="nofollow ugc">OpenAI Terms of Service</a> 
* OpenAI Privacy Policy: <a href="https://openai.com/privacy" rel="nofollow ugc">OpenAI Privacy Policy</a>
Data handling and privacy: 
Our Supabase Edge Functions act as a secure intermediary that forwards your image URLs to OpenAI’s ChatGPT API for analysis. OpenAI’s ChatGPT processes the images to generate descriptive alt text but does not use this data for training their models. No personal user data beyond the API key and image URLs is transmitted. Images are processed temporarily for the purpose of generating alt text and are not stored permanently by either service.

WS Image Alt Text Generator

Automatically generate high-quality, SEO-friendly alt text for your images using AI technology.

AI Auto Alt Text Generator vs WS Image Alt Text Generator