Connor Bulmer

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 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 (five at a time) with a configurable pause between batches.</li>
<li>Prompt fine-tuning – supply site-wide context and optionally include the image file name.</li>
<li>Image size & detail control – choose the resolution and level of visual detail sent.</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 OpenAI’s gpt-4o-mini vision model.</li>
<li>GPT-4o 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 GPT-4o. </li>
<li>Image Size to Send – Thumbnail, Medium, Large, or Full. </li>
<li>Image Detail Quality – ‘Low’ or ‘High’. </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 five-image batches during bulk runs. </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>
</ul>
<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>

AI Auto Alt Text Generator

Automatically generates alt text and image titles for your WordPress media uploads with GPT-4o mini, improving accessibility and SEO.

altomatic

Altomatic is a 2-in-1 solution that combines image compression and automatic alt text generation to help you optimize your site with zero effort.
Using AI, Altomatic processes every new image you upload—compressing it into WebP/AVIF for better page speed and SEO—and automatically writes accurate, descriptive alt text to boost accessibility and search rankings.
This is the tool busy site owners and web developers have been waiting for. Whether you’re managing one large site or many client projects, Altomatic helps you streamline image management, save hours of manual work, and ensure your images are doing their job.
<h3>Key Features</h3>
Automatic Alt Text Generation 
– Uses AI to generate relevant, descriptive alt text on image upload 
– Helps improve accessibility and on-page SEO 
– Supports multiple languages
Advanced Image Optimization 
– Compress images automatically with smart algorithms 
– Convert images to next-gen formats like WebP and AVIF 
– Optimize responsive image variants (srcset)
Built for Speed and Simplicity 
– Automatically processes new uploads in the background 
– Bulk optimization tools for existing media 
– Maintains original image quality while boosting performance
Customizable Settings 
– Choose which image sizes to optimize 
– Set preferred output formats 
– Enable or disable features per your workflow 
– Simple, intuitive settings panel in the WordPress admin
<h3>Configuration</h3>
<ol>
<li>Sign up for a free account and get your API key at <a href="https://altomatic.ai" rel="nofollow ugc">altomatic.ai</a></li>
<li>Go to <code>Settings > Altomatic</code></li>
<li>Paste your API key and customize settings:
<ul>
<li>Select image sizes to optimize</li>
<li>Choose output formats (WebP/AVIF/original)</li>
<li>Enable automatic alt text generation</li>
<li>Configure responsive image settings</li>
</ul>
</li>
</ol>
<h3>External Services</h3>
This plugin connects to the Altomatic API (https://api.altomatic.ai) to perform image optimization and alt text generation. Your images are uploaded only during processing and are never made public or shared.
See <a href="https://altomatic.ai/terms" rel="nofollow ugc">terms of use</a> and <a href="https://altomatic.ai/privacy" rel="nofollow ugc">privacy policy</a> for more details.
<h3>Support & Contact</h3>
<ul>
<li>Website: <a href="https://altomatic.ai" rel="nofollow ugc">https://altomatic.ai</a></li>
<li>Support Email: support@altomatic.ai</li>
</ul>

Altomatic

AI-powered image optimization and alt text generation. Improve site speed, SEO, and accessibility—all automatically.

AI Auto Alt Text Generator vs Altomatic