AI Auto Alt Text Generator vs Alt Magic

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. ✨ 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, including those that only have filename-based alt text, with a configurable pause between batches. Prompt fine-tuning – supply site-wide context and optionally include the image file name. 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. Image size & detail control – choose the resolution and level of visual detail sent. Developer-friendly – filters and actions to customise prompts, models and output, plus optional outgoing webhooks. WordPress Abilities API – registers a generate-alt-text ability (WordPress 6.9+/7.0) so core AI, agents and automation tools can generate alt text. 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 OpenAI. OpenAI Model – GPT-5.4 nano (default), GPT-5.4 mini, or legacy GPT-4o mini / GPT-5 mini / GPT-5 nano. 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. Webhook URL & signing secret – Optionally POST generated alt text/titles to an external endpoint (with an optional HMAC-SHA256 signature) for automation and logging. Developers The plugin is extensible via standard WordPress hooks, an outgoing webhook, and the WordPress Abilities API. Filters aatg_alt_text_prompt ( $prompt, $post_ID, $context ) – customise the alt-text prompt. aatg_image_title_prompt ( $prompt, $post_ID, $context ) – customise the title prompt. aatg_openai_request_payload ( $payload, $context, $messages ) – customise the full OpenAI request (model, messages, reasoning effort). aatg_generated_alt_text ( $alt_text, $post_ID ) – filter alt text before it is saved. aatg_generated_title ( $title, $post_ID ) – filter the title before it is saved. aatg_is_low_quality_alt ( $is_low, $alt, $post_ID ) – control which existing alt text the bulk tool regenerates. aatg_webhook_payload ( $payload, $post_ID, $result ) – customise the outgoing webhook body. aatg_supported_image_extensions ( $extensions ) – customise which image formats are sent to OpenAI (default: PNG, JPEG, GIF, WebP). Actions aatg_after_alt_text_generated ( $post_ID, $alt_text ) aatg_after_title_generated ( $post_ID, $title ) aatg_after_generation ( $post_ID, $result ) 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 X-AATG-Signature: sha256=… header (HMAC-SHA256 of the body) so your endpoint can verify authenticity. WordPress Abilities API On WordPress 6.9+ the plugin registers the ability ai-auto-alt-text/generate-alt-text (input: attachment_id) so WordPress core AI, agents, MCP servers and automation tools can generate alt text programmatically. Execute it with wp_get_ability( 'ai-auto-alt-text/generate-alt-text' )->execute( array( 'attachment_id' => 123 ) ). 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 If you configure a Webhook URL, generated alt text/titles (and the image URL) are also sent to that endpoint you control.

Alt Magic is an AI alt text generator for WordPress that automatically creates SEO-friendly image alt text for newly uploaded images and existing media library images. Start with 50 free monthly credits, then scale with fast bulk generation built for WooCommerce stores, publishers, agencies, and image-heavy WordPress sites. Built for high-volume workflows, Alt Magic can process 10,000+ images per hour. It helps improve image accessibility, supports better image SEO, and makes alt text generation easier to manage across large media libraries. Alt Magic also includes optional AI image renaming for teams that want cleaner, more descriptive filenames as part of their image optimization workflow. Why users choose Alt Magic Highly contextual and SEO-optimized 50 Free monthly alt text credits to get started easily Fast bulk alt text generation for existing and newly uploaded images Process 10,000+ images per hour on high-volume WordPress sites Affordable pricing at scale for stores, publishers, and agencies Active support with direct help for setup, troubleshooting, and custom guidance Built for WordPress and WooCommerce workflows Optional AI image renaming for better image organization Customer Reviews ⭐⭐⭐⭐⭐ Rated 4.8 stars on G2 – Read reviews on G2 Watch Alt Magic Plug-in in Action: Built for scale and complete image SEO workflows Many AI alt text plugins work well for smaller libraries, but become slower, more expensive, or harder to scale when you need bulk processing across a large number of images. Some tools rely on external model limits or generic workflows that are not built for large WordPress media libraries. Others focus only on adding alt text in the media library and do not offer a broader image optimization workflow. Alt Magic is built differently. It is designed for fast, stable, high-volume processing with better cost efficiency at scale. With Alt Magic, you get: * Faster bulk processing for large image libraries * Better value on high-volume workloads * Support for both existing images and new uploads * AI image renaming for both existing images and new uploads * A broader WordPress image SEO workflow from one plugin This makes Alt Magic a strong fit for WooCommerce stores, publishers, agencies, directories, and other image-heavy websites. Features Automatic Alt Text Generation Generate alt text automatically for newly uploaded images. Bulk Alt Text Generation Create alt text for existing WordPress media library images in bulk with a single click. High-Speed Processing Built for large sites and media libraries with processing speeds of 10,000+ images per hour. Free Monthly Credits Start free every month with 50 credits and scale up only when you need more volume. WooCommerce Optimization Generate better alt text for product images across WooCommerce stores and large catalogs. Context-Aware Generation Create more relevant alt text based on image content and surrounding context. Additional Media Properties Generate not only alt text, but also captions, titles, and descriptions where supported. Processed Images History View, manage, edit, and regenerate previously processed images from one place. SEO Plugin Compatibility Works smoothly with popular SEO plugins including Yoast, Rank Math, SEOPress, Squirrly SEO, and AIOSEO. Multilingual Support Generate alt text in over 150 languages for multilingual websites and global stores. AI Image Renaming Rename already uploaded images and automatically rename new uploads with descriptive, SEO-friendly filenames. Broad Format Support Supports common image formats including JPG, JPEG, PNG, GIF, WebP, AVIF, and SVG. Service Information Alt Magic is a service-based plugin that provides AI-powered alt text generation and image renaming services. The plugin requires an active internet connection and an Alt Magic account with API credentials to function. Service Provider: This plugin connects to Alt Magic’s cloud-based AI service to process images and generate alt texts and image filenames. The plugin does not perform AI processing locally. Remote Servers Called: The plugin makes API calls to the following service endpoints: – Service Base URL: https://api.altmagic.pro – /image-name-generator-wp – For AI-powered image filename generation – /combined-generator-wp – For combined alt text and image name generation – /user-details – For fetching user account information and credit balance – /wp-plugin-events/wp-plugin-events – For plugin usage analytics and events Account Requirements: An Alt Magic account and API key are required to use this plugin. Users must: 1. Sign up for an account at https://www.altmagic.pro 2. Obtain an API key from their Alt Magic dashboard 3. Enter the API key in the plugin settings Data Transmission: The plugin sends image data (image files or URLs) to the Alt Magic service for AI analysis and processing. This data is used solely to generate alt text descriptions and image filenames. The plugin also transmits basic plugin usage events for service improvement. Privacy and Terms: For detailed information about data handling, privacy practices, and terms of service, please refer to: – Service Link – Terms of Use – Privacy Policy