Alt Text Studio

Alt Text Studio automatically generates alt text for every image you upload — no manual work required. Built for SEO, accessibility compliance (WCAG, ADA, Section 508), and e-commerce stores.
<h4>Key Features</h4>
<ul>
<li>Automatic generation — every uploaded image gets alt text in the background</li>
<li>Bulk generate — fix hundreds of existing images in one click</li>
<li>SEO plugin integration — Yoast, Rank Math, All in One SEO, SEOPress, The SEO Framework, SmartCrawl, Squirrly</li>
<li>WooCommerce — auto-include product name and brand in alt text</li>
<li>Multi-language — 194 languages with WPML and Polylang support</li>
<li>Media Library — custom column, missing-alt filter, bulk actions</li>
<li>Post/page refresh — sync updated alt text back into post content</li>
<li>WP-CLI — <code>wp alttextstudio generate</code> for automation</li>
<li>WordPress Multisite — network-wide settings with shared API key</li>
<li>Developer friendly — actions, filters, constants for full customization</li>
</ul>
<h4>Unique vs. Other Alt Text Plugins</h4>
<ul>
<li>E-commerce color context — primary/secondary colors in product image alt text</li>
<li>Negative keywords — explicit list of words to exclude from generated alt text</li>
<li>Auto-context hints — filename and URL path used as hints when they match the image</li>
</ul>
<h4>Getting Started</h4>
<ol>
<li>Install and activate the plugin</li>
<li>Sign up at <a href="https://alttextstudio.com" rel="nofollow ugc">alttextstudio.com</a> and generate an API key</li>
<li>Paste the key into Settings → Alt Text Studio</li>
<li>Upload an image — alt text is automatically generated!</li>
</ol>
<h3>External Services</h3>
This plugin connects to the Alt Text Studio API (hosted at api.alttextstudio.com) to generate alt text for images. When you upload an image or click Generate:
<ul>
<li>The image (either as a URL reference or as base64-encoded data) is sent to our servers along with your optional settings (text length, languages, SEO keywords, e-commerce fields, custom prompt).</li>
<li>Our servers pass the image to our AI provider for analysis and return the generated alt text.</li>
<li>The image and generated text are associated with your Alt Text Studio account for your library and billing history. You can delete any image from your library at any time via your account dashboard.</li>
<li>No image content is sent anywhere other than our own servers. We do not share data with advertisers or unrelated third parties.</li>
</ul>
This service is provided by:
<ul>
<li>Alt Text Studio LLC</li>
<li>Service Terms: https://alttextstudio.com/terms-of-service</li>
<li>Privacy Policy: https://alttextstudio.com/privacy-policy</li>
</ul>
An account + API key is required to use this plugin. Your first 25 credits are free; paid plans are described at https://alttextstudio.com/pricing.
<h3>Privacy</h3>
This plugin’s privacy policy is the same as the Alt Text Studio service: https://alttextstudio.com/privacy-policy
Summary of what’s transmitted:
<ul>
<li>Images you upload or select for generation (sent to our API for processing)</li>
<li>Image metadata: filename, URL, optional fields you enter (brand, product name, colors, keywords, custom prompts)</li>
<li>Your site’s URL (sent as part of the API request user-agent for support and abuse prevention only; never used for tracking or marketing)</li>
</ul>
The plugin does not:
<ul>
<li>Track site visitors</li>
<li>Send any usage data to analytics services</li>
<li>Transmit data from the frontend of your website — only the WordPress admin when you or your team generate alt text</li>
</ul>
If your site is subject to GDPR, CCPA, or similar regulations, update your own privacy policy to disclose the use of this plugin and link to ours.

Alt Text Studio – Generate image alt text automatically for SEO

Automatically generate SEO-optimized, accessibility-friendly alt text for every image. Works with WooCommerce, WPML, Polylang, and SEO plugins.

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.

Alt Text Studio – Generate image alt text automatically for SEO vs AI Auto Alt Text Generator