AI Alt Text Generator vs Auto Alt Text

AI Alt Text Generator writes clear, descriptive alt text for every image on your WordPress site — improving accessibility compliance (WCAG 2.2, ADA, Section 508, and the European Accessibility Act) and image SEO at the same time. It works out of the box: activate the plugin and start generating, no API key and no signup required. Every site gets 50 free images per month through the built-in managed credits service. That makes it a fit for small organizations that need accessible, legally compliant websites but don’t want to wrangle developer accounts or AI billing — nonprofits, churches, schools, clinics, and small businesses working toward WCAG / EU Accessibility Act compliance. Alt text is required for accessible, legally compliant websites, and it helps search engines understand your images. But writing it by hand across an entire media library rarely happens — so this plugin does it for you, in bulk or automatically on upload. It produces concise, WCAG-aligned descriptions (no “image of…” filler, sensible length) and can fold in the page context and your SEO focus keyphrase for sharper, more relevant alt text. It pairs perfectly with accessibility audit tools that flag missing alt text — this is the plugin that fills the gaps. How it works — two ways to generate: Managed credits (default, recommended) — No API key, no signup. The plugin connects to the AI Alt Text Generator managed service automatically and gives every site 50 free images per month. Need more? Affordable paid credit plans are available. This uses an external, account-based service (see the disclosure below) and is optional beyond the free tier. Bring your own API key (advanced) — Prefer to run on your own OpenAI or Anthropic account? Add your own API key in the Advanced settings and generation runs at-cost, directly with your provider, with no per-image fees or vendor lock-in. You choose the provider and model. Key Features: – Works out of the box: no API key needed — 50 free images per month on every site – Accessibility & compliance: WCAG-aligned output to support ADA, EAA, and Section 508 requirements – SEO keyphrase integration: automatically weaves in focus keyphrases from Yoast SEO, Rank Math, and SEOPress (without keyword stuffing) – Page-context aware: uses the page/post the image belongs to for more relevant descriptions – Bring your own key (optional): advanced users can plug in their own OpenAI or Anthropic key — any vision-capable model, no lock-in – Bulk Processing: generate alt text for your whole library at once, or automatically on upload – Custom Prompts: tailor the AI prompt to your brand and needs – Multi-Language Support: generate alt text in many languages – Testing Feature: preview prompts before applying them to images – WP-CLI Support: bulk-generate from the command line – Developer-friendly: extensible via action/filter hooks for custom integrations and add-ons WP-CLI: The plugin registers a wp ai-alt-text command suite, making it easy to automate alt text generation across one or many sites. # Bulk-generate alt text for all images missing it (uses managed credits by default) wp ai-alt-text generate # Optional: configure your own provider and API key (advanced) wp ai-alt-text activate --provider=openai --key=sk-xxxxxxxx # Regenerate alt text for specific attachments wp ai-alt-text generate --ids=12,34,56 --force # Preview what would be processed without calling the API wp ai-alt-text generate --limit=20 --dry-run # Show current configuration and coverage wp ai-alt-text status A typical install-and-generate workflow needs no key at all: wp plugin install ai-alt-text-generator --activate wp ai-alt-text generate --yes New in Latest Version: – Managed credits are now the default: generate alt text with no API key and no signup — 50 free images per month on every site – Bring-your-own OpenAI/Anthropic key moved to an “Advanced” option for users who prefer to run on their own account – WCAG-aligned output, SEO focus-keyphrase integration (Yoast / Rank Math / SEOPress), and page-context awareness – Optionally set the image Title, Caption, and Description from the generated alt text – Future-proof model handling (no hard-coded model versions; configurable defaults) Important: This plugin uses an external AI service to generate alt text — either the optional managed-credit service (account-based, free tier plus paid plans) or your own OpenAI/Anthropic key. See the External Service Usage Disclosure below. AI Alt Text Generator Pro (optional upgrade) Need automation at scale? The optional Pro add-on builds on this free plugin with: – WooCommerce product context for commerce-aware, SEO-rich alt text – Scheduled background scans that describe new and existing images automatically – A coverage analytics dashboard to track your progress toward 100% – Automatic updates and priority support Learn more about Pro — the free plugin remains fully functional on its own. External Service Usage Disclosure This plugin relies on external AI services to generate alt text. In all cases, data (images and their metadata) is sent to an external service for processing. The plugin does not store your images or generated alt text on our servers beyond what is needed to return your result. Managed credits service (default) By default the plugin uses the AI Alt Text Generator managed credits service so it works with no API key. On activation, the plugin automatically connects your site to obtain a free account (50 images per month) — this registers your site with the external service and requires an account. Images to be described are sent to this service for processing. Use beyond the free monthly tier requires a paid credit plan. The service is operated via https://store.lessbutmore.ai?utm_source=plugin&utm_medium=readme&utm_campaign=disclosure — please review the site for its terms and privacy policy. You can disable managed credits in the plugin settings and use your own API key instead. Bring-your-own-key providers (optional, advanced) If you add your own API key, images are sent to the provider you select: – OpenAI: For more information, please review the OpenAI Terms of Use and Privacy Policy – Anthropic: For more information, please review the Anthropic Terms of Service and Privacy Policy You choose which path to use and are only required to agree to the terms of the service you actually use. Support For support, feature requests, or bug reports, please contact us through the WordPress plugin support forum.

This plugin implements the automatic creation of alt text for images uploaded to the media library. The alt text is generated at the time of uploading the image and it is also possible to generate the alt text for images already present in the media library. To generate the alt text, you can choose to use the artificial intelligence of OpenAI, Anthropic Claude, Google Gemini or Azure, or decide if you simply want to copy the title of the article where the image is uploaded or the name of the image. Clearly, using artificial intelligence will allow for a more accurate and useful alt texts. Features This plugin allows you to generate alt texts in the following ways: – using Openai APIs (the most recently released models and any other compatible model available on your account) – using Anthropic Claude API – using Google Gemini API – using Azure APIs for computational vision; – recovering the title of the image – recovering the title of the article in which the image is uploaded It can also fill in, on the fly, the missing alt texts of the images already published in your content, using the alt text stored in the media library. Getting Started After installing the plugin, click on the ‘Auto Alt Text’ menu item. Choice of Generation Method Select the Generation Method you prefer OpenAI’s APIs In your OpenAI account, retrieve the following data to enter on the options page: – API Key Once the API Key is saved, the list of the models available on your account is retrieved directly from OpenAI, so you can always choose among the up-to-date models. If the model you selected is retired by OpenAI, a notice is displayed in the administration area and the least expensive available model is used as a fallback until you choose a new one. Choose the model you want to use for generating the alt text. Enter a prompt for generating the alt text according to your needs. Claude Anthropic’s APIs In your Anthropic account, retrieve the following data to enter on the options page: – API Key Choose the model you want to use for generating the alt text. Enter a prompt for generating the alt text according to your needs. Google Gemini’s APIs In your Google AI Studio account, retrieve the following data to enter on the options page: – API Key Once the API Key is saved, the list of the models available on your account is retrieved directly from Google, so you can always choose among the up-to-date models. If the model you selected is retired by Google, a notice is displayed in the administration area and the least expensive available model is used as a fallback until you choose a new one. Choose the model you want to use for generating the alt text. Enter a prompt for generating the alt text according to your needs. Azure’s APIs On your Azure account, create a Computer Vision instance and retrieve the following data to enter on the options page: – Computer Vision API Key – Computer Vision Endpoint If you want to generate an alt text in English, save the options without filling in any other fields. If you want to generate an alt text in a different language, on your Azure account, create a Translator instance and retrieve the following data to enter on the options page: – Translator Instance API Key – Translator Instance Endpoint – Translator Instance Region After entering this data, save the options. Select the desired language and save the options again. Title of the article For this generation method, there are no options to set as the alt text will be generated by copying the title of the article in which the image is uploaded. In case the article is not uploaded as an attachment of an article, the “Title of the attachment” method will be used as a fallback. Title of the attachment For this generation method, there are no options to set as the alt text will be generated by copying the title of the image. Functioning Once the plugin is configured, each time an image is uploaded to the media library, an alt text will be automatically set based on the selected generation method. For images already in the media library, you can create bulk alt texts. Open the Media Library in the “list” view, select the images for which to generate the alt text, and choose the “Generate alt text” bulk action. (Depending on the number of images chosen and their weight, this may take some time.) You can also generate the alt text of a single image directly from the media library. Open the Media Library in “grid” mode, choose the image for which to generate the alt text, and click the “Generate alt text” button. In no time the alt text field will be overwritten by the generated description. Automatic alt text rendering in content Images that were inserted in your posts and pages before the alt text was generated keep the empty alt attribute saved in the content, even after the media library has been filled. By enabling the “Automatically render alt text in content” option, when a page is displayed the plugin looks at every image of the content and, for those without an alt text, it writes the alt text stored in the media library (when available). Images that already have an alt text are never touched, and your saved content is not modified in any way: the alt text is only added to the rendered HTML. The option is disabled by default and it is independent of the chosen generation method. Developers can also control this behaviour with two filters: aatxt_content_alt_text_enabled to skip the processing for a specific request, and aatxt_content_image_alt_text to filter the alt text before it is written into the image tag. WP-CLI If you prefer generating alt text in batch (e.g., to avoid processing in the Media Library UI), you can use WP-CLI. This is the recommended way to work on a large media library: the bulk action of the Media Library runs inside a single web request, so depending on your server settings (PHP max_execution_time, PHP-FPM request_terminate_timeout, web server or proxy timeouts) it can be interrupted before all the selected images have been processed. WP-CLI is not affected by those limits, shows a progress bar and can be resumed with --offset. Generate alt text for a list of attachment IDs: wp auto-alt-text generate --ids=123,456,789 Process all image attachments in batches: wp auto-alt-text generate --all --limit=200 --offset=0 wp auto-alt-text generate --all --limit=200 --offset=200 Dry run (no metadata updates): wp auto-alt-text generate --ids=123,456 --dry-run Force overwrite of existing alt text (even if “Keep existing alt text” is enabled): wp auto-alt-text generate --all --limit=200 --offset=0 --force Notice: If you choose one of the methods that involves the use of external APIs, the upload times for images in the media library might increase because it requires sending a request to the APIs, waiting for the external server to process, and waiting for a response. Logging If the generation of the alt text via AI is set, in case of errors, to avoid blocking the editorial work, the image is loaded anyway but without the alt text being compiled. When a call to the OpenAI, Anthropic, Gemini or Azure API fails, a record containing the error message is saved in a custom database table. In this case, the cause of the error can be seen on the Auto Alt Text -> Error log page. External Services This plugin uses the following external services alternatively: OpenAI Selecting the generation method “OpenAI’s APIs” will use the API services of OpenAI. This plugin does not collect any information from your OpenAI account. The data transmitted to OpenAI mainly consists of the image files uploaded to your website and the specified prompt. For accurate information on privacy and conditions of use, please consult the privacy policy and terms and conditions directly on the official website. It is also advisable to check the costs and usage statistics of the API service on the OpenAI website. Anthropic Claude Selecting the generation method “Anthropic’s APIs” will use the API services of Anthropic. This plugin does not collect any information from your Anthropic Claude account. The data transmitted to Anthropic Claude mainly consists of the image files uploaded to your website and the specified prompt. For accurate information on privacy and conditions of use, please consult the privacy policy, terms and conditions for consumers and terms and conditions for commercial directly on the official website. It is also advisable to check the costs and usage statistics of the API service on the Anthropic website. Google Gemini Selecting the generation method “Google Gemini’s APIs” will use the API services of Google Gemini. This plugin does not collect any information from your Google account. The data transmitted to Google mainly consists of the image files uploaded to your website and the specified prompt. For accurate information on privacy and conditions of use, please consult the privacy policy and terms of service directly on the official website. It is also advisable to check the costs and usage statistics of the API service on the Google AI website. Azure Selecting the “Azure’s APIs” generation method will use the API services of Microsoft Azure. This plugin does not collect any information from your Azure account. The data transmitted to Azure consists mainly of image files uploaded to your website. For accurate information on privacy and conditions of use, please directly consult the privacy policy and terms and conditions on the official website. It is also advisable to check the costs and usage statistics of the API service on the Microsoft Azure’s website. Encryption Constants We strongly recommend defining the new plugin-specific constants in your wp-config.php: define( 'AATXT_ENCRYPTION_KEY', 'a_random_string_of_at_least_64_characters' ); define( 'AATXT_ENCRYPTION_SALT', 'another_random_string_of_at_least_64_characters' ); You will find these two define(…) lines already generated for you on the Auto Alt Text » Options page – simply copy & paste them before the /* That's all, stop editing! Happy publishing. */ line in your wp-config.php. If you choose not to add them, the plugin will continue to work normally, but it will fall back to using your WordPress LOGGED_IN_KEY / LOGGED_IN_SALT, which may break if those salts are ever changed. Disclaimer Auto Alt Text is a plugin that helps users automatically generate Alt Texts of their images using AI services such as OpenAI’s ChatGPT or Microsoft Azure. Users need their own API key and must follow the rules set by the AI service they choose. By using Auto Alt Text, users agree to watch and manage AI-made content and address any issues or misuse. AI Engine developer and related parties are not responsible for any problems or losses caused by the use of the plugin or AI-generated content. Credits A big thank you to everyone who has improved this plugin with a pull request: joshuafredrickson – native WP-CLI support for batch alt text generation, and the Media Library bulk action redirect fix that preserves pagination and filters The full list is available on the contributors page. Contributions are welcome: feel free to open an issue or a pull request on GitHub.