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.

Junaid Ahmed

alttextai

AltText.ai automatically generates alt text for your images.
Automatic: Every uploaded image is analyzed and alt text is automatically added to the image properties.
Supports Multiple Formats: Handles JPG, PNG, WebP, SVG, and AVIF images for comprehensive coverage across modern image formats.
Optimized SEO for WooCommerce: Our Ecommerce Vision system intelligently includes your product name in the generated alt text.
Keyword-rich alt text: Seamlessly integrates focus keyphrases from popular SEO plugins, including Yoast SEO, Rank Math, All in One SEO, SEOPress, The SEO Framework, SmartCrawl, and Squirrly SEO, ensuring natural language optimization.
Chat GPT: Use your own custom ChatGPT prompt to automatically modify the generated alt text.
Multiple Languages: Over 130 languages for alternative text. Support for WPML and Polylang translations.
Bulk Actions: Use our Bulk Generate tool or bulk action dropdown to add alt text to existing images in your library.
Review and Edit: See what was processed and manually edit the generated alt text if desired.
Try for FREE: No credit card needed to start on a trial plan.
<h3>Demo Video</h3>
<iframe loading="lazy" title="AltText.ai - WordPress plugin tutorial" width="750" height="422" src="https://www.youtube.com/embed/LpMXPbMds4U?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

Alt Text AI – Automatically generate image alt text for SEO and accessibility


AltText AI has made our job easier by removing the hassle of adding alt text manually to each image. and the AI is pretty darn accurate tbh. But I love that the team went and put in the effort to introduce Human Reviews which makes the solution perfect in case the AI has something else on its mind :D


Keeping SEO automated is now easier than ever


We discovered AltText.ai through AppSumo, and I must say we’re incredibly impressed with the quality of the output. The AI does an excellent job of integrating relevant keywords into the assigned pages, and the results have been spot on.



We’ve tested it across a few of our sites, and the experience has been absolutely seamless.



We’re excited to see how the plugin continues to evolve and wish your team all the best. You’ve earned a lifetime user in us here at WP Codeus!


A Web Development Agency Must Have

Automatically sets the descriptive alt text of your images. Boosts your SEO and accessibility.

AI Auto Alt Text Generator vs Alt Text AI – Automatically generate image alt text for SEO and accessibility