AI Alt Text

Generate alt text for images using AI. Supports multiple AI providers including OpenAI, Claude, Gemini, Ollama, Azure OpenAI, and Grok.

Features

• Bulk Update: Update alt text for multiple images at once from the media library
• Block Editor Integration: Generate alt text directly from the image block in the editor
• Multiple AI Providers: Choose from OpenAI (GPT-4o), Anthropic Claude, Google Gemini, Azure OpenAI, Ollama (local), or Grok
• Language Detection: Automatically uses WordPress language settings for generated alt text
• Flexible Configuration: Configure via constants, environment variables, or the admin settings page

Requirements

• WordPress 6.8 or higher
• PHP 8.3 or higher
• API key for your chosen AI provider (except Ollama which runs locally)

Installation

• Quick Install

  • Download ai-alt-text.zip
  • Upload via Plugins > Add New > Upload Plugin
  • Activate the plugin.
  • Go to Settings → AI Alt Text to configure your AI provider

• Composer Install

  composer require soderlind/ai-alt-text

• Updates

  • Plugin updates are handled automatically via GitHub. No need to manually download and install updates.

Configuration

Via Admin Settings

Navigate to Settings → AI Alt Text and configure:

1. Select your AI provider
2. Enter your API key
3. Optionally customize the model and other settings

Via Constants (wp-config.php)

// AI Provider: 'openai', 'anthropic', 'gemini', 'azure', 'ollama', 'grok'
define( 'AI_ALT_TEXT_PROVIDER', 'openai' );

// API Key
define( 'AI_ALT_TEXT_API_KEY', 'your-api-key-here' );

// Optional: Custom model
define( 'AI_ALT_TEXT_MODEL', 'gpt-4o' );

// Azure-specific settings
define( 'AI_ALT_TEXT_AZURE_ENDPOINT', 'https://your-resource.openai.azure.com' );
define( 'AI_ALT_TEXT_AZURE_DEPLOYMENT', 'your-deployment-name' );

// Ollama-specific settings
define( 'AI_ALT_TEXT_OLLAMA_HOST', 'http://localhost:11434' );

Via Environment Variables

AI_ALT_TEXT_PROVIDER=openai
AI_ALT_TEXT_API_KEY=your-api-key-here
AI_ALT_TEXT_MODEL=gpt-4o

Usage

Bulk Update

1. Go to Media → Library (list view)
2. Select images you want to update
3. Choose “Generate AI Alt Text” from the bulk actions dropdown
4. Click “Apply”

From the Block Editor

1. Add or select an image block
2. In the sidebar, find the “AI Alt Text” panel
3. Click “Generate Alt Text with AI”

AI Providers

Provider	Model	Notes
OpenAI	gpt-4o	Requires API key from OpenAI
Anthropic	claude-sonnet-4-20250514	Requires API key from Anthropic
Google Gemini	gemini-2.0-flash	Requires API key from Google AI Studio
Azure OpenAI	gpt-4o	Requires Azure subscription and deployment
Ollama	llava	Free, runs locally. Install from ollama.ai
Grok	grok-2-vision-1212	Requires API key from xAI

For detailed configuration instructions, see AI Provider Documentation.

Hooks & Filters

Modify Generated Alt Text

add_filter( 'ai_alt_text_generated', function( $alt_text, $attachment_id ) {
    // Modify the generated alt text
    return $alt_text;
}, 10, 2 );

Customize the AI Prompt

add_filter( 'ai_alt_text_prompt', function( $prompt, $language ) {
    // Customize the prompt sent to the AI
    return $prompt;
}, 10, 2 );

Skip Auto-generation for Specific Images

add_filter( 'ai_alt_text_should_generate', function( $should_generate, $attachment_id ) {
    // Return false to skip auto-generation
    return $should_generate;
}, 10, 2 );

Translations

The plugin is translation-ready. Translation files are located in the languages/ directory.

Creating a Translation

1. Copy languages/ai-alt-text.pot to languages/ai-alt-text-{locale}.po
   • Example: ai-alt-text-nb_NO.po for Norwegian Bokmål
   • Example: ai-alt-text-de_DE.po for German
2. Translate the strings using Poedit or similar tool
3. Save to generate the .mo file
4. For JavaScript translations, run:

   wp i18n make-json languages/

Available Locales

Contributions welcome! Submit your translation via a pull request.

Development

Building Assets

npm install
npm run build

Running Tests

# JavaScript tests
npm test

# PHP tests
./vendor/bin/phpunit

Code Standards

# Check PHP code standards
./vendor/bin/phpcs

# Fix PHP code standards
./vendor/bin/phpcbf

License

GPL v2 or later. See LICENSE for details.

Credits

Developed by Per Soderlind.

Support

• GitHub Issues

📦 Source: soderlind/ai-alt-text · Edit on GitHub